NOAA KLM User's GuideSection 4.3 |
The direct sounder broadcast (also referred to as the beacon transmission) contains the low bit rate instrument (HIRS/3, HIRS/4 on NOAA-N,-P, SBUV/2, SEM, and DCS/2, but not AMSU) digital data, identical to that within the HRPT transmission. Data are therefore available in both the VHF and S-band links. Those users receiving the high resolution HRPT transmission would likely find it most desirable to extract the low rate data from this data stream. The VHF beacon transmission is available to users who do not intend to install the more complex equipment necessary to receive high data rate S-band service. The lower data rates permit the user to install less complex, less costly equipment to receive the data without degrading its quality.
Onboard the satellite, output from the low data rate instruments is collected and formatted by the TIROS Information Processor (TIP). Parallel outputs are provided for the real-time VHF beacon transmission (DSB) and the MIRP (for the HRPT service). The instrument data is multiplexed with analog and digital housekeeping data. The TIP output directly modulates the beacon transmission. The data is transmitted as a 8.32 Kbps split phase signal (similar to the HRPT transmission, above) over one of the beacon transmitters (BTX). Detailed transmission characteristics and TIP parameters are shown in Tables 4.3.2-1 and 4.3.2-2.
| Carrier Modulation | Digital split phase, phase modulated |
| Transmitter Frequency (MHz) | 137.35 or 137.77 |
| Transmitter Power (EOL) | 1.0 W (30 dBm) |
| Radiated Power (dBm) | 9.5 (over 90% of sphere) |
| Polarization | RCP |
| Major Frame | |
|---|---|
| Rate | 1 major frame/32 sec |
| Minor Frames/Major Frame | 320 |
| Minor Frame | |
| Rate | 10 minor frames/sec |
| Number of words | 11090 |
| Format | See Table 4.3.3.1-1 |
| Word Parameters | |
| Rate | 1040 words/sec |
| Number of bits/word | 8 |
| Order | Bit 1=MSB, Bit 8=LSB |
| Bit Parameters | |
| Rate | 8320 bits/sec |
| Format | Split phase |
| Data "0" | -67/+67 degrees |
| Data "1" | +67/-67 degrees |
The TIP format is based on a major frame which contains 320 minor frames.
About one-quarter of the 104 telemetry word locations in the TIP minor frame have been changed for NOAA KLM. This is due to the removal of the Stratospheric Sounding Unit (SSU) and Earth Radiation Budget Experiment (ERBE) from the new series of spacecraft. Word locations previously assigned to the SSU have been allocated to the HIRS/3 and Data Collection System (DCS). The ERBE word locations have been reassigned to DCS, as well. In addition, two words have been allocated to the Decryption Authentication Unit (DAU). For NOAA KLM, Figure 4.3.3.1-1 shows the TIP telemetry word location in the frame format, and Table 4.3.3.1-1 contains TIP telemetry word titles, locations within the frame, and word descriptions in tabular form.
| 0 - 1 - 2 | 4-BIT | 20-BIT SYNCH | S/C ID | 11101101 11100010 0000 |
3 - 4 - 5 STATUS, DWELLMODE ADDRESS, MINOR FRAME COUNTER |
6 - 7 CMD VERIFICATION DATA |
8 DIG-B SUB-COM-1 |
9 ANALOG SUBCOM (32 SEC) |
10 ANALOG SUBCOM (16 SEC) |
11 ANALOG SUBCOM (1 SEC) |
|||||
| 12 DIG-B SUB-COM-2 |
13 ANALOG SUB-COM (16 SEC) |
14 DAU-1 |
15 DAU-2 |
16 HIRS/3 |
17 HIRS/3 |
18 DCS-2 |
19 DCS-2 |
20 SEM |
21 SEM |
22 HIRS/3 |
23 HIRS/3 |
| 24 DCS-2 |
25 DCS-2 |
26 HIRS/3 |
27 HIRS/3 |
28 DCS-2 |
29 DCS-2 |
30 HIRS/3 |
31 HIRS/3 |
32 DCS-2 |
33 DCS-2 |
34 HIRS/3 |
35 HIRS/3 |
| 36 SBUV/2 |
37 SBUV/2 |
38 HIRS/3 |
39 HIRS/3 |
40 DCS-2 |
41 DCS-2 |
42 HIRS/3 |
43 HIRS/3 |
44 DCS-2 |
45 DCS-2 |
46 - 47 CPU-A TELEMETRY |
|
| 48 - 49 - 50 - 51 |------------- CPU-A TELEMETRY --------------| |
52 DCS-2 |
53 DCS-2 |
54 HIRS/3 |
55 HIRS/3 |
56 DCS-2 |
57 DCS-2 |
58 HIRS/3 |
59 HIRS/3 |
|||
| 60 DCS-2 |
61 DCS-2 |
62 HIRS/3 |
63 HIRS/3 |
64 DCS-2 |
65 DCS-2 |
66 HIRS/3 |
67 HIRS/3 |
68 DCS-2 |
69 DCS-2 |
70 HIRS/3 |
71 HIRS/3 |
| 72 DCS-2 |
73 DCS-2 |
74 HIRS/3 |
75 HIRS/3 |
76 DCS-2 |
77 DCS-2 |
78 HIRS/3 |
79 HIRS/3 |
80 SBUV/2 |
81 SBUV/2 |
82 HIRS/3 |
83 HIRS/3 |
| 84 HIRS/3 |
85 HIRS/3 |
86 DCS-2 |
87 DCS-2 |
88 HIRS/3 |
89 HIRS/3 |
90 DCS-2 |
91 DCS-2 |
92 HIRS/3 |
93 HIRS/3 |
94 DCS-2 |
95 DCS-2 |
| 96 - 97 - 98 - 99 - 100 - 101 |---------------- CPU-B TELEMETRY -----------------| |
102 SPARE 01010101 |
103 6-BITS EVEN PARITY |
MINOR FRAME PERIOD - 0.1 SEC MAJOR FRAME PERIOD - 32 SEC OUTPUT DATA RATE - 8.320 KBPS |
||||||||
| Note: Number in upper left corner indicates minor frame word number. | |||||||||||
| Function | No. of words | Word position |
Bit No. 1 2 3 4 5 6 7 8 Plus Word Code & Meaning |
|---|---|---|---|
| Frame Sync & S/C ID |
3 | 0 1 2 |
1 1 1 0 1 1 0 1 (MSB is first) 1 1 1 0 0 0 1 0 0 0 0 0 A A A A (Last 4 bits are spacecraft ID) |
| Status | 1- | 3 | Bit 1: Cmd verification (cv) status; 1=cv update word present in frame; 0=no cv update in frame Bits 2&3: TIP status; 00=orbital mode; 10=CPU Memory Dump Mode; 01=Dwell Mode; 11=Boost Mode Bits 4-6: Major Frame Count; 000=Major Frame 0; 111=Major Frame 7; MSB first; Counter incremented every 320 minor frames |
| Dwell Mode Address |
1+ | 3 4 |
Bits 7&8, Bits 1-7: 9 bit dwell mode address of analog channel that is being
monitored continuously 000000000= Analog channel 0 111111111= Analog channel 511 |
| Minor Frame Counter | 1+ | 4 5 |
Bit 8, Bits 1-8: 000000000= Minor Frame 0 100111111= Minor Frame 319 |
| Command Verification | 2 | 6 7 |
Bits 9 thru 24 of each valid received or stored command word are placed in the 16 bit slots of telemetry words 6 and 7 on a one-for-one basis. |
| Time Code | 5 | 8,9 9 9,10, 11 12 |
9 bits of Binary Day Count, MSB first Bits 2-5: 0 1 0 1, Spare bits 27 bits of Binary millisec of Day Count, MSB first Time code is inserted in word location 8-12 only in minor frame 0 of every major frame. The data inserted is referenced to the beginning of the first bit of the minor frame sync word of minor frame 0 within ± millisecond. |
| Digital "B" Subcom-1 |
1 | 8 | A subcommutation of Discrete Inputs collected to form 8 bit words. 256 Discrete Inputs (32 words) can be accommodated. It takes 32 frames to sample all inputs once (sampling rate=once/3.2 sec). A Major Frame contains 10 complete Digital "B" subcommutated frames. |
| Analog Subcom (32 sec) |
1 | 9 | A subcommutation of up to 191 analog points sampled once every 32 seconds plus 64 analog points sampled twice every 32 seconds (once every 16 seconds). Bit 1 of each word represents 2560 mV, while Bit 8 represents 20 mV. |
| Analog Subcom (16 sec) |
1 | 10 | This subcommutation is controlled by a PROM located in the TIP and contains 160 word locations with 128 analog channels sampled once every 16 seconds. |
| Analog Subcom (1 sec) |
1 | 11 | This subcommutation is controlled by a PROM in the TIP and contains 10 analog channels sampled once every 1 second. Word 0 of this subcom is filled with data from an analog point selected by command. The selected analog point may be any of the 512 analog points available to the TIP. Bit 1 of each word represents 2560 mV while Bit 8 represents 20 mV. |
| Digital "B" Subcom-2 | 1 | 12 | The subcommutation of discrete inputs collected to form 8 Bit words. 256 discrete inputs (32 words) can be accommodated. It takes 32 minor frames to sample all inputs once (sampling rate=once/3.2 sec). A Major Frame contains 10 complete Digital "B" subcommutated frames. 64 of these Bit locations corresponding to TIP minor frames 24-31 form the XSU Digital "A" data. The XSU generates an 8 word subcom which is read out at the rate of one word per minor frame. The XSU subcom is synchronized with its word 1 in minor frame 24. |
| Analog Subcom-2 (16 sec) |
1 | 13 | This subcommutation is controlled by a PROM located in the TIP and contains 160 word locations with 128 analog channels sampled once every 16 seconds. The remaining 32 word locations contain data from the Solar Array Telemetry Commutator Unit (SATCU). The SATCU receives inputs from 16 sources on the solar array, commutates them and presents this output to the TIP on channel 282. The TIP formats this stream and presents it in the last 32 word locations. The 32 words represent two successive passes through the SATCU subcom. |
| DAU-1 | 1 | 14 | 8 Bit Housekeeping Telemetry words are formed by the DAU-1 and read out by the telemetry system an average rate of 10 words per second. |
| DAU-2 | 1 | 15 | 8 Bit Housekeeping Telemetry words are formed by the DAU-2 and read out by the telemetry system at an average rate of 10 words per second. |
| HIRS/3 | 36 | 16,17, 22,23, 26,27, 30,31, 34,35, 38,39, 42,43, 54,55, 58,59, 62,63, 66,67, 70,71, 74,75, 78,79, 82,83, 84,85, 88,89, 92,93 |
8 Bit words are formed by the HIRS/3 experiment and are read out by the telemetry system at an average rate of 360 words per second. |
| SEM | 2 | 20,21 | 8 Bit words are formed by the SEM sensor and read out by the telemetry system at an average rate of 20 words per second. |
| DCS-2 | 32 | 18,19, 24,25, 28,29, 32,33, 40,41, 44,45, 52,53, 56,57, 60,61, 64,65, 68,69, 72,73, 76,77, 86,87, 90,91, 94,95 |
8 Bit words are formed by the DCS experiment and are read out by the telemetry system at an average rate of 320 words per second. |
| SBUV/2 | 4 | 36,37, 80,81 |
8 Bit words are formed by the SBUV/2 experiment and read out by the telemetry system at an average rate of 40 words per second. |
| CPU A Telemetry |
6 | 46,47, 48,49, 50,51 |
A block of three 16 Bit CPU words is read out by the telemetry system every minor frame. |
| CPU B Telemetry |
6 | 96,97,98,99, 100,101 |
A second block of three 16 Bit CPU words is read out by the telemetry system every minor frame. |
| CPU Data Status |
1- | 103 | Bits 1 and 2: 00= All CPU data received 01= All CPU A data received; CPU B data incomplete 10= All CPU B data received; CPU A data incomplete 11= CPU A and CPU B data incomplete |
| Parity | 1- | 103 | Bit 3: Even parity check in words 2 thru 18 Bit 4: Even parity check in words 19 thru 35 Bit 5: Even parity check in words 36 thru 52 Bit 6: Even parity check in words 53 thru 69 Bit 7: Even parity check in words 70 thru 86 Bit 8: Even parity check in words 87 thru bit 7 of word 103 |
For NOAA-N,-P, Figure 4.3.3.2-1 shows the TIP telemetry word location in the frame format. Other than HIRS/4 data in place of HIRS/3 data, the only real difference between a NOAA KLM TIP minor frame and a NOAA-N,-P TIP minor frame is byte 102, which contains MIU data.
| 0 - 1 - 2 20-BIT SYNCH S/C ID 4-BITS |
3 - 4 - 5 STATUS, DWELL MODE ADDRESS, MINOR FRAME COUNTER See Note 2 |
6 - 7 CMD VERIFICATION DATA |
8 DIG-B SUB-COM 1 (3.2 SEC) |
9 ANALOG SUBCOM (32 SEC) |
10 ANALOG SUBCOM (16 SEC) |
11 ANALOG SUBCOM (1 SEC) |
|||||
| 12 DIG-B SUB-COM-2 (3.2SEC) |
13 ANALOG SUBCOM (16 SEC) |
14 DAU-1 |
15 DAU-2 |
16 - 17 HIRS/4 |
18 - 19 DCS-2 |
20 - 21 SEM |
22 - 23 HIRS/4 |
||||
| 24 - 25 DCS-2 |
26 - 27 HIRS/4 |
28 - 29 DCS-2 |
30 - 31 HIRS/4 |
32 - 33 DCS-2 |
34 - 35 HIRS/4 |
||||||
| 36 - 37 SBUV/2 |
38 - 39 HIRS/4 |
40 - 41 DCS-2 |
42 - 43 HIRS/4 |
44 - 45 DCS-2 |
46 - 47 CPU-A TELEMETRY |
||||||
| 48 - 49 - 50 - 51 CPU-A TELEMETRY |
52 - 53DCS-2 | 54 - 55 HIRS/4 |
56 - 57 DCS-2 |
58 - 59 HIRS/4 |
|||||||
| 60 - 61 DCS-2 |
62 - 63 HIRS/4 |
64 - 65 DCS-2 |
66 - 67 HIRS/4 |
68 - 69 DCS-2 |
70 - 71 HIRS/4 |
||||||
| 72 - 73 DCS-2 |
74 - 75 HIRS/4 |
76 - 77 DCS-2 |
78 - 79 HIRS/4 |
80 - 81 SBUV/2 |
82 - 83 HIRS/4 |
||||||
| 84 - 85 HIRS/4 |
86 - 87 DCS-2 |
88 - 89 HIRS/4 |
90 - 91 DCS-2 |
92 - 93 HIRS/4 |
94 - 95 DCS-2 |
||||||
| 96 - 97 - 98 - 99 - 100 - 101 CPU-B TELEMETRY |
102 MIU | 103 See Note 3 |
MINOR FRAME PERIOD - 0.1 SEC MAJOR FRAME PERIOD - 32 SEC OUTPUT DATA RATE - 8.320 KBPS |
||||||||
| Notes: 1. Number in upper left corner indicates minor frame word number. 2. Minor Frames 3, 4 and 5 consist of 1-bit command verification status in MSB of Word 3, followed by 2-bit TIP status and 3-bit major frame counter, followed by 9-bit dwell address and 9-bit subcom counter to fill out minor frames 4 and 5. 3. Minor Frame 103 consists of 2-bit CPU status in MSB, followed by 6-bit TIP parity. |
|||||||||||
| Function | No. of words | Word position |
Bit No. 1 2 3 4 5 6 7 8 Plus Word Code & Meaning |
|---|---|---|---|
| Frame Sync & S/C ID |
3 | 0 1 2 |
1 1 1 0 1 1 0 1 (MSB is first) 1 1 1 0 0 0 1 0 0 0 0 0 A A A A (Last 4 bits are spacecraft ID) |
| Status | 1- | 3 | Bit 1: Cmd verification (cv) status; 1=cv update word present in frame; 0=no cvupdate in frame Bits 2&3: TIP status; 00=orbital mode; 10=CPU Memory Dump Mode; 01=Dwell Mode; 11=Boost Mode Bits 4-6: Major Frame Count; 000=Major Frame 0; 111=Major Frame 7; MSB first; Counter incremented every 320 minor frames |
| Dwell Mode Address |
1+ | 3 4 |
Bits 7&8, Bits 1-7: 9 bit dwell mode address of analog channel that is being
monitored continuously 000000000= Analog channel 0 111111111= Analog channel 511 |
| Minor Frame Counter | 1+ | 4 5 |
Bit 8, Bits 1-8: 000000000= Minor Frame 0 100111111= Minor Frame 319 |
| Command Verifi- cation |
2 | 6 7 |
Bits 9 thru 24 of each valid received or stored command word are placed in the 16 bit slots of telemetry words 6 and 7 on a one-for-one basis. |
| Time Code | 5 | 8,9 9 9,10, 11 12 |
9 bits of Binary Day Count, MSB first Bits 2-5: 0 1 0 1, Spare bits 27 bits of Binary millisec of Day Count, MSB first Time code is inserted in word location 8-12 only in minor frame 0 of every major frame. The data inserted is referenced to the beginning of the first bit of the minor frame sync word of minor frame 0 within ± millisecond. |
| Digital "B" Subcom-1 |
1 | 8 | A subcommutation of Discrete Inputs collected to form 8 bit words. 256 Discrete Inputs (32 words) can be accommodated. It takes 32 frames to sample all inputs once (sampling rate=once/3.2 sec). A Major Frame contains 10 complete Digital "B" subcommutated frames. |
| Analog Subcom (32 sec) |
1 | 9 | A subcommutation of up to 191 analog points sampled once every 32 seconds plus 64 analog points sampled twice every 32 seconds (once every 16 seconds). Bit 1 of each word represents 2560 mV, while Bit 8 represents 20 mV. |
| Analog Subcom (16 sec) |
1 | 10 | This subcommutation is controlled by a PROM located in the TIP and contains 160 word locations with 128 analog channels sampled once every 16 seconds. |
| Analog Subcom (1 sec) |
1 | 11 | This subcommutation is controlled by a PROM in the TIP and contains 10 analog channels sampled once every 1 second. Word 0 of this subcom is filled with data from an analog point selected by command. The selected analog point may be any of the 512 analog points available to the TIP. Bit 1 of each word represents 2560 mV while Bit 8 represents 20 mV. |
| Digital "B" Subcom-2 |
1 | 12 | The subcommutation of discrete inputs collected to form 8 Bit words. 256 discrete inputs (32 words) can be accommodated. It takes 32 minor frames to sample all
inputs once (sampling rate=once/3.2 sec). A Major Frame contains 10 complete Digital "B" subcommutated frames. 64 of these Bit locations corresponding to TIP minor frames 24-31 form the XSU Digital "A" data. The XSU generates an 8 word subcom which is read out at the rate of one word per minor frame. The XSU subcom is synchronized with its word 1 in minor frame 24. |
| Analog Subcom-2 (16 sec) |
1 | 13 | This subcommutation is controlled by a PROM located in the TIP and contains 160 word locations with 128 analog channels sampled once every 16 seconds. The remaining 32 word locations contain data from the Solar Array Telemetry Commutator Unit (SATCU). The SATCU receives inputs from 16 sources on the solar array, commutates them and presents this output to the TIP on channel 282. The TIP formats this stream and presents it in the last 32 word locations. The 32 words represent two successive passes through the SATCU subcom. |
| DAU-1 | 1 | 14 | 8 Bit Housekeeping Telemetry words are formed by the DAU-1 and read out by the telemetry system an average rate of 10 words per second. |
| DAU-2 | 1 | 15 | 8 Bit Housekeeping Telemetry words are formed by the DAU-2 and read out by the telemetry system at an average rate of 10 words per second. |
| HIRS/4 | 36 | 16,17, 22,23, 26,27, 30,31, 34,35, 38,39, 42,43, 54,55, 58,59, 62,63, 66,67, 70,71, 74,75, 78,79, 82,83, 84,85, 88,89, 92,93 |
8 Bit words are formed by the HIRS/4 experiment and are read out by the telemetry system at an average rate of 360 words per second. |
| SEM | 2 | 20,21 | 8 Bit words are formed by the SEM sensor and read out by the telemetry system at an average rate of 20 words per second. |
| DCS-2 | 32 | 18,19, 24,25, 28,29, 32,33, 40,41, 44,45, 52,53, 56,57, 60,61, 64,65, 68,69, 72,73, 76,77, 86,87, 90,91, 94,95 |
8 Bit words are formed by the DCS experiment and are read out by the telemetry system at an average rate of 320 words per second. |
| SBUV/2 | 4 | 36,37, 80,81 |
8 Bit words are formed by the SBUV/2 experiment and read out by the telemetry system at an average rate of 40 words per second. |
| CPU A Telemetry |
6 | 46,47, 48,49, 50,51 |
A block of three 16 Bit CPU words is read out by the telemetry system every minor frame. |
| CPU B Telemetry |
6 | 96,97,98, 99,100,101 |
A second block of three 16 Bit CPU words is read out by the telemetry system every minor frame. |
| MIU | 8 | 102 | MIU |
| CPU Data Status |
1- | 103 | Bits 1 and 2: 00= All CPU data received 01= All CPU A data received; CPU B data incomplete 10= All CPU B data received; CPU A data incomplete 11= CPU A and CPU B data incomplete |
| TIP Parity | 1- | 103 | Bit 3: Even parity check in words 2 thru 18 Bit 4: Even parity check in words 19 thru 35 Bit 5: Even parity check in words 36 thru 52 Bit 6: Even parity check in words 53 thru 69 Bit 7: Even parity check in words 70 thru 86 Bit 8: Even parity check in words 87 thru bit 7 of word 103 |
The data from the HIRS/3 are provided to the TIP system from a storage register. The TIP clock pulse (C1) and Data Select pulses determine the time at which data are called out. The TIP formatter calls out groups of 8-bit words in a sequence that multiplexes HIRS/3 data with that of other instruments. Because of the large quantity of HIRS/3 data to be transmitted and the use of 13-bit decoding of radiometric data, it was not possible to format the HIRS/3 data into neat 8-bit segments. The HIRS/3 data are therefore provided as a continuous stream with 13-bit word lengths. During any minor frame, there are 288 bits of data; each bit is identified as to its purpose.
A full set of HIRS/3 operational data, including command status monitors, housekeeping information and radiance data of the 20 channels, is contained in the Digital "A" output. The HIRS/3 data repeats every 6.4 seconds as described below. The 6.4 second period contains 64 elements.
1) Element Definition
Digital "A" output is divided into "elements" of 288 bits. An element is phased to fit into a TIP minor frame as described above.
2) Element Formats
Sixty-four elements make up each scan. The formats for the elements repeat every 6.4 seconds and correspond to the particular parts of the scan. Element numbers 0-55 are Earth scan data. Scan element 0 describes the data at the time of viewing the first Earth scan position. Scan element 55 designates the last Earth scan position. Scan elements 56-63 occur during retrace during normal Earth scanning. The same element number designations continue when the scan is commanded to a calibration target. Normally the mirror motion to the warm calibration target takes place during the normal retrace interval. In the case of slew to the space look position, the motion occurs during scan elements 0 to 7.
Data reduction must take this into account as required. The elements are divided as follows:
(a) Bits 1-26
Two 13 bit words have the same function in all 64 elements. The function assembled in these words are as follows:
| Word 1 | Function | Range (Decimal) |
|---|---|---|
| 1-8 | Scan Encoder Position | 0 to 199 |
| 9-13 | Electronic Cal Level Indicator | 0 to 331 |
| Word 2 | Function | Range (Decimal) |
| 1-6 | Channel 1 Period Monitor | 0 to 63 |
| 7-12 | Element Number | 0 to 63 |
| 13 | Filter Sync Designator | n/a |
(b) Bits 27-286
This group of bits is divided into 20 13-bit words (20 Ch x 13 Bits). For elements 0-55, these are the Radiant Signal Output. The word functions are dependent on element number. Except for the two status words in element 63, all words are quantity where bit 1 is the sign bit and bits 2 through 13 are amplitude (0 to 4095). Bit 2 is the most significant bit (MSB) and bit 13 is the least significant bit (LSB) of the quantity. The sign bit is:
logic "1" is + (positive) and logic "0" is - (negative).
The HIRS/3 instrument serial number is preset for each instrument in element 63, bits 42-44. The protoflight has the designation 001; the flight models will be designated 002 on up.
(c) Bits 287 and 288
In the same manner as for bits 1 through 26, these two bits have the same function in all 64 elements. In order to aid determination of times when data should not be used, we have included a Valid Data Bit into the data stream. This bit is a "1" when all conditions are normal and data may be considered good. It will be a "0" when the scan system is in a slew mode or when the filter wheel is not synchronized to the timing system.
Bit 287 Valid Data Bit
logic "1" Valid Data
logic "0" Ignore Radiometric Data
Minor Word Parity Check is a bit inserted to make the total word odd. This permits automatic checking for data losses in the transmission of the data from the HIRS/3.
Bit 288 Odd bit parity
3) Function Descriptions
Scan Encoder Position - Encoder position is the sensed position of the scan mirror in 1.8 degree increments. The scan positions are described later, but it may be noted that encoder position "1" occurs at the first Earth scan position, hence will be the encoder position noted during element "0".
Electronic Cal Level Indicator - Electronic calibration level advances from 0 to 31, defining the step level measured in each radiometric channel during elements 56 and 57. Since both a positive and negative calibration is made at the end of each scan line, the level applies to both. The step level starts at 0 on the first scan after a calibration start pulse and continues repetitively after that and even when calibration is disabled.
Channel 1 Period Monitor - Measures the variation in time interval of a segment of the filter wheel on each rotation. The reading measures 1.248 MHz clock intervals of that segment; hence, it defines velocity variations to a granularity of 0.8 microseconds. This is a diagnostic output and is not used in system data processing or evaluation.
Element Number - The number of this data group. It advances from 0 to 63 with element 0 related to the first Earth scan position. The element number repeats regardless of scan position or mode.
Filter Sync Designator - Filter Sync is a "1" when the filter wheel is in synchronization with the timing system. This is diagnostic data not normally used in data collection or processing.
| Element Number | Bit Number | Function | Remarks |
|---|---|---|---|
| 0-55 | 27-39 | Radiometric Channel No. 1 (669 cm-1) | 0 counts radiance from scene equal radiance from filter wheel (FW). Plus (+) values are warmer than FW. |
| 40-52 | Radiometric Channel No.17 (2360 cm-1) | 0 counts offset from FW radiance. Plus and minus are warmer and cooler than offset. | |
| 53-65 | Radiometric Channel No. 2 (680 cm-1) | No offset. | |
| 66-78 | Radiometric Channel No. 3 (690 cm-1) | No offset. | |
| 79-91 | Radiometric Channel No. 13 (2190 cm-1) | Offset. | |
| 92-104 | Radiometric Channel No. 4 (703 cm-1) | No offset. | |
| 105-117 | Radiometric Channel No. 18 (2515 cm-1) | Offset. | |
| 118-130 | Radiometric Channel No. 11 (1365 cm-1) | No offset. | |
| 131-145 | Radiometric Channel No. 19 (2660 cm-1) | Offset. | |
| 144-156 | Radiometric Channel No. 7 (749 cm-1) | No offset. | |
| 157-169 | Radiometric Channel No. 8 (900 cm-1) | No offset. | |
| 170-182 | Radiometric Channel No. 20 (14,500 cm-1) | Black is minus. White is plus. | |
| 183-195 | Radiometric Channel No. 10 (1,225 cm-1) | No offset. | |
| 196-208 | Radiometric Channel No. 14 (2,210 cm-1) | Offset. | |
| 209-221 | Radiometric Channel No. 6 (733 cm-1) | No offset. | |
| 222-234 | Radiometric Channel No. 5 (716 cm-1) | No offset. | |
| 235-247 | Radiometric Channel No. 15 (2,240 cm-1) | Offset. | |
| 248-260 | Radiometric Channel No. 12 (1,488 cm-1) | No offset. | |
| 261-273 | Radiometric Channel No. 16 (2,270 cm-1) | Offset. | |
| 274-286 | Radiometric Channel No. 9 (1,030 cm-1) | Offset. | |
| 56 | 27-286 | Positive Electronics Calibration. Applied to 20 radiometric channels. | Calibration level advances one of the 32 equal level steps on successive scans. The offset and gain of each channel will influence the amplitude of the signal. The calibration level applied to the electronics channels is indicated. |
| 57 | 27-286 | Negative Electronics Calibration applied to 20 radiometric channels | n/a |
| 27-91 | Internal Warm Target Temperature Sensor #1 | Value repeated 5 times. Range 273 to 333 K. | |
| 92-156 | Temperature Sensor #2 | Value repeated 5 times. Range 273 to 333 K. | |
| 157-221 | Temperature Sensor #3 | Value repeated 5 times. Range 273 to 333 K. | |
| 222-286 | Temperature Sensor #4 | Value repeated 5 times. Range 273 to 333 K. | |
| 59 | 27-91 | Internal Cold Target Temperature Sensor #1 | n/a |
| 92-156 | Internal Cold Target Temperature Sensor #2 | n/a | |
| 157-221 | Internal Cold Target Temperature Sensor #3 | n/a | |
| 222-286 | Internal Cold Target Temperature Sensor #4 | n/a | |
| 60 | 27-91 | Filter Wheel Housing Temperature Sensor #1 | Value repeated 5 times. Range 273 to 333 K. |
| 92-156 | Temperature Sensor #1 | Value repeated 5 times. Range 273 to 333 K. | |
| 157-221 | Temperature Sensor #1 | Value repeated 5 times. Range 273 to 333 K. | |
| 222-286 | Temperature Sensor #1 | Value repeated 5 times. Range 273 to 333 K. | |
| 27-91 | Patch Temperature Expanded Scale | Value repeated 5 times. Range 90 to 150 K. | |
| 92-156 | First Stage Radiator Temperature Sensor | Value repeated 5 times. Range 150 to 320 K. | |
| 157-221 | Filter Wheel Housing Heater Current | Value repeated 5 times. Range 0 to 500 mA. | |
| 222-286 | Electronic Calibration Digital to Analog | Value repeated 5 times. Range volts 0 to 4 V. | |
| 27-39 | Scan Mirror Temperature | Range 260 to 320 K | |
| 40-52 | Primary Telescope Temperature | Range 260 to 320 K | |
| 53-65 | Secondary Telescope Temperature | Range 260 to 320 K | |
| 66-78 | HIRS/3 Baseplate Temperature | Range 260 to 320 K | |
| 79-91 | HIRS/3 Electronics Temperature | Range 260 to 320 K | |
| 92-104 | Patch Temperature - Full Range | Range 90 to 320 K | |
| 105-117 | Scan Motor Temperature | Range 260 to 320 K | |
| 118-130 | Filter Wheel Motor Temperature | Range 260 to 320 K | |
| 131-143 | Cooler Housing Temperature | Range 260 to 320 K | |
| 144-156 | Patch Control Power | Range 0 to 80 mW | |
| 157-169 | Scan Motor Current | Range 0.65 to 1.0 | |
| 170-182 | Filter Motor Current | Range 100 to 300 mA | |
| 183-195 | +15 VDC | Range 15 ± 0.2 V | |
| 196-208 | -15 VDC | Range -15 ± 0.2 V | |
| 209-221 | +7.5 VDC | Range +7.5 ± 0.05 V | |
| 222-234 | -7.5 VDC | Range -7.5 ± 0.05 V | |
| 235-247 | +10 VDC | Range 10 ± 0.2 V | |
| 248-260 | +5 VDC | Range 5 ± 0.2 V | |
| 261-273 | Analog Ground | Range ± 1 count | |
| 274-286 | Analog Ground | Range ± 1 count | |
| 63 | 27-39 | Line Counter (gives the number of lines from the last auto calibration sequence) | 0 to 8191 (There is no sign bit used in the line counter). Reset to 0 count is only when counter overflows. |
| 40-52 | First Status Word | First 5 bits are instrument serialnumber (no sign bit). The remaining bits indicate status as shown in Table 4.3.4.1.1-2. | |
| 53-65 | Second Status Word | First 5 bits are zero filled. The remaining bits indicate status as shown in Table 4.3.4.1.1-2. | |
| 66-78 | Data Verification Binary Code | Binary Code is:
(1,1,1,1,1,0,0,1,0,0,0,1,1) Equivalent Base 10 value +3,875 |
|
| 79-91 | Base 10 value +1,443 | ||
| 92-104 | Base 10 value -1,522 | ||
| 105-117 | Base 10 value -1,882 | ||
| 118-130 | Base 10 value -1,631 | ||
| 131-143 | Base 10 value -1,141 | ||
| 144-156 | Base 10 value 1,125 | ||
| 157-169 | Base 10 value 3,655 | ||
| 170-182 | Base 10 value -2,886 | ||
| 183-195 | Base 10 value -3,044 | ||
| 196-208 | Base 10 value -3,764 | ||
| 209-221 | Base 10 value -3,262 | ||
| 222-234 | Base 10 value -2,283 | ||
| 235-247 | Base 10 value -2,251 | ||
| 248-260 | Base 10 value 3,214 | ||
| 261-273 | Base 10 value 1,676 | ||
| 274-286 | Base 10 value 1,992 |
4) Digital "A" Status Telemetry
The last element of each scan, element 63, contains two status words. Bits 45-52 and 58-65 of element 63 are command status bits. Logic state definition is shown in Table 4.3.4.1.1-2.
| Bit Number | Function | Remarks |
|---|---|---|
| First Status Word | ||
| 45 | Instrument ON/OFF | ON=1 |
| 46 | Scan Motor ON/OFF | ON=0 |
| 47 | Filter Wheel ON/OFF | ON=0 |
| 48 | Electronics ON/OFF | ON=1 |
| 49 | Cooler Heat ON/OFF | ON=0 |
| 50 | Internal Warm Target Position | True=0 |
| 51 | Internal Cold Target Position | True=0 |
| 52 | Space Position | True=0 |
| Second Status Word | ||
| 58 | Nadir position | True=0 |
| 59 | Calibration Enable/Disable | Enabled =0 |
| 60 | Cooler Door Release Enable/Disable | Enabled=0 |
| 61 | Cooler Door Open | YES=1 |
| 62 | Cooler Door Closed | YES=1 |
| 63 | Filter Housing Heat ON/OFF | ON=0 |
| 64 | Patch Temperature Control ON/OFF | ON=0 |
| 65 | Filter Motor Power HIGH | Normal=1 |
Digital "A" data from the instrument is described in Table 4.3.4.1.2-1. The TIP clock pulse (C1) and Data Enable pulses determine the time at which the data is called out. The TIP formatter calls out groups of 8-bit words in a sequence that multiplexes HIRS/4 data with that of other instruments on the NOAA-N, -P spacecraft. Along with this requirement, the large quantity of instrument data to be transmitted and the use of 13-bit encoding for radiometric data, it was not possible to format the data into 8-bit segments. The HIRS/4 data is therefore provided as a continuous stream composed of 13-bit word lengths but clocked out in 8-bit words by the TIP. During any Minor Frame there are 288 bits of HIRS data which are extracted at an equivalent 8,320 bps rate.
The data format remains the same during the 56 earth scan element time periods. During retrace, which is an interval of eight earth scan element time periods, the data format is changed to provide for measurement of the internal electronic calibration and to sample all of the Housekeeping telemetry data.
Scan Element 0 contains the data which describes the scene at the time of viewing the first scan position. The scan positions are described later, but it should be noted that encoder position "1" occurs at the first earth scan position and hence will encoder position noted during element "0". Scan element 55 designates the last scan position. Scan Elements 56-63 occur during the scan mirror retrace during normal earth scanning. These same element number designations apply also when the scan is commanded to a calibration target during the Auto Calibration (Autocal) sequence. Normally the mirror slewing motion between calibration targets takes place during the normal retrace interval except for the case of slew to the space look position where the motion occurs during scan elements 0 to 7. Therefore, space look during Autocal is only for 48 elements (8 through 55).
In order to determine when radiometric data should not be used, a Valid Data Bit is included in the data stream. This bit is a "1" when all conditions are normal and the radiometric data may be considered good. It will be "0" when the scan system is in a slew mode.
The electronic calibration level advances one level per scan line from 0 to 31, defining the step level measured in each radiometric channel during elements 56 and 57. Since both a positive and negative calibration is made during a scan line, the same level value applies for both.
The Channel 1 Period Monitor measures the time interval of the travel from the Channel 1 to the Channel 2 segments of the filter wheel on each rotation. The reading measures 1.248 MHz clock intervals during that segment, hence defines filter wheel rotation time with a resolution variation of 0.8 microseconds. This is not used in normal system data processing or evaluation but is a powerful diagnostic tool to aid in assessing the filter wheel subsystem health.
With every filter wheel revolution, a block of data is generated. This block, called an element is 288 bits long. A scan line consists of 56 scene views and eight retrace elements. Thus, there are 64 (56 + 8) filter wheel revolutions per line and 64 elements per scan line. Each element is numbered 0 through 63 and this 6-bit binary number is included in each element at bit location 20-25.
Filter Sync Designator is a "1" when the filter wheel is in synchronism with the data control timing system. This is diagnostic data not normally used in data collection or processing. If the Filter Sync Designator is "0" the radiometric data is not valid.
Radiant Signal Output is the 13-bit binary level measurement of the signals coming from the various detectors. The first bit is a sign bit ("1" positive, "0" os negative). The remaining twelve data bits are straight binary code in order from the most significant to least significant bit.
Minor Word Parity Check is the last bit of each minor Frame or data element and is inserted to make the total number of "ones" in that data element odd. This permits checking for loss of data integrity between transmission from the instrument and reconstruction on the ground.
Elements 58-61 contain the outputs of the temperature sensors and the ECAL DAC, sampled five times during each element. This approach provides a more accurate measurement of the more critical sensor temperatures.
In Element 62, the data multiplexer connects other voltage and temperature sensors outputs into the A/D converter for one sample each, thereby allowing monitoring of all the major test points in the system.
Element 63 contains the command status, the instrument serial number, the total line number since the last radiometric calibration (in 13-bit natural binary), and a fixed word pattern and fill bits.
The Instrument Serial Number is unique for each instrument. The HIRS/4 instruments will be designated 015, 016, 017 and 018.
Command Status is a tabulation of the state of the command relays.
Table 4.3.4.1.2-1 shows the HIRS/4 Digital A data output format. The only content difference between HIRS/3 data and HIRS/4 data is in element 59.
| Element # | Bit # | Description | Range Counts | Notes |
|---|---|---|---|---|
| 0-55 (Earth Scan Elements) | 1-8 | Encoder Position | 0 to 200 | |
| 9-13 | Electronic Cal Level | 0 to 31 | ||
| 14-19 | Channel 1 Period Monitor | 0 to 63 | ||
| 20-25 | Element Number | 0 to 63 | ||
| 26 | Filter Sync Designator | 0 or 1 | ||
| 27-286 | Radiant Signal Output (20 Channels x 13 bits) | 0 to ±4095 | ||
| 287 | ||||
| 56-63 | 1-26 | Same as above | ||
| 287,288 | Same as above | |||
| 56 | 27-286 | Positive Electronic Calibration. 13 bitsfor each channel (Cal. Level advancesone of 32 equal levels on succeedingscans) | ||
| 57 | 27-286 | Negative Electronic Calibration. 13 bits for each channel (Cal. Level advances one of 32 equal levels on succeeding scans) | ||
| 58 | 27-91 | Internal Warm Target #1, 13 bits x 5 Times | ||
| 92-156 | Internal Warm Target #2, 13 bits x 5 Times | |||
| 157-221 | Internal Warm Target #3, 13 bits x 5 Times | |||
| 222-286 | Internal Warm Target #4, 13 bits x 5 Times | |||
| 27-91 | Internal Cold Target #1, 13 bits x 5 Times | |||
| 92-156 | Ground | |||
| 157-221 | Internal Warm Target #5, 13 bits x 5 Times | |||
| 222-286 | Tertiary Telescope Temp, 13 bits x 5 Times | |||
| 27-91 | Filter Housing Temp. #1, 13 bits x 5 Times | |||
| 92-156 | Filter Housing Temp. #2, 13 bits x 5 Times | |||
| 157-221 | Filter Housing Temp. #3, 13 bits x 5 Times | |||
| 222-286 | Filter Housing Temp. #4, 13 bits x 5 Times | |||
| 61 | 27-91 | Patch Temp Expanded, 13 bits x 5 Times | ||
| 92-156 | First Stage Temp, 13 bits x 5 Times | |||
| 157-221 | Filter Housing Control Power/Temp, 13 bits x 5 Times | |||
| 222-286 | Electronic Calibration DAC, 13 bits x 5 Times | |||
| 62 | 27-39 | Scan Mirror Temperature | ||
| 40-52 | Primary Telescope Temp | |||
| 53-65 | Secondary Telescope Temp | |||
| 66-78 | Baseplate Temp | |||
| 79-91 | Electronics Temp | |||
| 92-104 | Patch Temp - Full Range | |||
| 105-117 | Scan Motor Temp | |||
| 118-130 | Filter Motor Temp | |||
| 131-143 | Radiant Cooler Housing Temp | |||
| 144-156 | Patch Control Power | |||
| 157-169 | Scan Motor Current | |||
| 170-182 | Filter Motor Current | |||
| 183-195 | +15 Vdc | |||
| 196-208 | -15 Vdc | |||
| 209-221 | +7.5 Vdc | |||
| 222-234 | -7.5 Vdc | |||
| 235-247 | +10 Vdc | |||
| 248-260 | +5 Vdc | |||
| 261-273 | Analog Ground | |||
| 274-286 | Analog Ground | |||
| 63 | 27-39 | Line Count | ||
| 40 | Fill Zero | |||
| 41-44 | Instrument Serial Number | |||
| 45-52 | Command Status | 1 | ||
| 53-57 | Fill Zeroes | |||
| 58-65 | Command Status | 1 | ||
| 66-78 | Binary Code (1,1,1,1,1,0,0,1,0,0,0,1,1) +3875 (base 10) | 2 | ||
| 79-91 | +1443 | 2 | ||
| 92-104 | -1522 | 2 | ||
| 105-117 | -1882 | 2 | ||
| 118-130 | -1631 | 2 | ||
| 131-143 | -1141 | 2 | ||
| 144-156 | +1125 | 2 | ||
| 157-169 | +3655 | 2 | ||
| 170-182 | -2886 | 2 | ||
| 183-195 | -3044 | 2 | ||
| 196-208 | -3764 | 2 | ||
| 209-221 | -3262 | 2 | ||
| 222-234 | -2283 | 2 | ||
| 235-247 | -2251 | 2 | ||
| 248-260 | +3214 | 2 | ||
| 261-273 | +1676 | 2 | ||
| 274-286 | +1992 | 2 | ||
| Command Status Bits | ||||
| 63 | 45 | Instrument ON/OFF | ON=1 | 1 |
| 46 | Scan Motor ON/OFF | ON=0 | 1 | |
| 47 | Filter Wheel ON/OFF | ON=0 | 1 | |
| 48 | Electronics ON/OFF | ON=1 | 1 | |
| 49 | Cooler Heat ON/OFF | ON=0 | 1 | |
| 50 | Internal Warm Target Position | True=0 | 1 | |
| 51 | Internal Cold Target Position | True=0 | 1 | |
| 52 | Space Position | True=0 | 1 | |
| 58 | Nadir Position | True=0 | 1 | |
| 59 | Calibration Enable/Disable | Enabled=0 | 1 | |
| 60 | Cover Release Enable/Disable | Enabled=0 | 1 | |
| 61 | Cooler Cover Open | Yes=1 | 1 | |
| 62 | Cooler Cover Closed | Yes=1 | 1 | |
| 63 | Filter Housing Heat ON/OFF | ON=0 | 1 | |
| 64 | Patch Temp Control ON/OFF | ON=0 | 1 | |
| 65 | Filter Motor Power HIGH | Normal=1 | 1 | |
| Notes: 1. Command Status Bits. 2. Fixed word pattern used to establish data stream synchronism with TIP. |
||||
SEM-2 data accumulation and transfer are synchronized to the spacecraft's 32 second Major Frame. The Major Frame consists of 320 0.1 second Minor Frames, and SEM-2 is assigned two Digital "A" data words (20 and 21) per Minor Frame.
The Digital "A" telemetry format is shown in Table 4.3.4.2-1 which identifies the data assignments for each of the two SEM data words in the 320 Minor Frames constituting one Major Frame.
MEPED Digital "A" data consists of six directional proton measurements and three directional electron measurements for each of two directions of incidence (0 and 90 degrees) and four omni-directional proton measurements. All but the two highest energy omni-directional proton measurements are read out every two seconds. The two highest energy omnidirectional proton measurements are read out every four seconds. The MEPED Digital "A" data and readout rates are summarized in Table 4.3.4.2-2.
TED Digital "A" data consists of a 0.05 to 1 keV partial energy flux measurement, a 1 to 20 keV partial energy flux measurement, maximum differential energy fluxes, four-point differential energy spectra and background measurements for electrons and protons, each at two angles of incidence (0 and 30 degrees). The TED Digital "A" output data and readout rates are summarized in Table 4.3.4.2-3. Note that the four differential energy flux maximum channel identifiers (0EM, 0PM, 3EM and 3PM) are each four bits long (each identifies 1 of 16 channels) and are combined into two 8 bit words (0EM/0PM and 3EM/3PM). Note also that two (0 and 30 degrees) proton four-point differential energy spectra are read out only three times every 32 seconds, while the two (0 and 30 degrees) electron four-point differential energy spectra are read out four times every 32 seconds (every 8 seconds). Sensor background data and synchronization words are read out in place of the fourth proton four-point differential energy spectral data.
| MinorFrame# Data in Word 20 Data in Word 21 |
0 CKSM 0P1 |
20 TED SWP VAN SUB5 |
40 TED E CEM HV - |
60 TED P CEM HV - |
80 MEP OMNI BV - |
100 AN SUB 1 - |
120 AN SUB 2 - |
140 AN SUB 3 - |
160 AN SUB 4 - |
180 TED IFC V - |
200 MEP IFC V - |
220 BL 1 - |
240 BL 2 - |
260 BL SUB - |
280 0EBKH - |
300 3EBKH - |
House keeping |
| .1 sec | 1 0P2 0P3 |
21 - - |
41 - - |
61 - - |
81 - - |
101 - - |
121 - - |
141 - - |
161 - - |
181 - - |
201 - - |
221 - - |
241 - - |
261 - - |
281 - - |
301 - - |
|
| 2 0P4 0P5 |
22 - - |
42 - - |
62 - - |
82 - - |
102 - - |
122 - - |
142 - - |
162 - - |
182 - - |
202 - - |
222 - - |
242 - - |
262 - - |
282 - - |
302 - - |
||
| 3 0P5 0E1 |
23 - - |
43 - - |
63 - - |
83 - - |
103 - - |
123 - - |
143 - - |
163 - - |
183 - - |
203 - - |
223 - - |
243 - - |
263 - - |
283 - - |
303 - - |
||
| 4 0E2 0E3 |
24 - - |
44 - - |
64 - - |
84 - - |
104 - - |
124 - - |
144 - - |
164 - - |
184 - - |
204 - - |
224 - - |
244 - - |
264 - - |
284 - - |
304 - - |
||
| 5 9P1 9P2 |
25 - - |
45 - - |
65 - - |
85 - - |
105 - - |
125 - - |
145 - - |
165 - - |
185 - - |
205 - - |
225 - - |
245 - - |
265 - - |
285 - - |
305 - - |
MEPED 90 degree Telescope | |
| 6 9P3 9P4 |
26 - - |
46 - - |
66 - - |
86 - - |
106 - - |
126 - - |
146 - - |
166 - - |
186 - - |
206 - - |
226 - - |
246 - - |
266 - - |
286 - - |
306 - - |
||
| 7 9P5 9P6 |
27 - - |
47 - - |
67 - - |
87 - - |
107 - - |
127 - - |
147 - - |
167 - - |
187 - - |
207 - - |
227 - - |
247 - - |
267 - - |
287 - - |
307 - - |
||
| 8 9E1 9E2 |
28 - - |
48 - - |
68 - - |
88 - - |
108 - - |
128 - - |
148 - - |
168 - - |
188 - - |
208 - - |
228 - - |
248 - - |
268 - - |
288 - - |
308 - - |
||
| 9 0P4 0P5 |
29 - - |
49 - - |
69 - - |
89 - - |
109 - - |
129 - - |
149 - - |
169 - - |
189 - - |
209 - - |
229 - - |
249 - - |
269 - - |
289 - - |
309 - - |
MEPED OMNI | |
| .1 sec | 10 0P4 0P5 |
30 - - |
50 - - |
70 - - |
90 - - |
110 - - |
130 - - |
150 - - |
170 - - |
190 - - |
210 - - |
230 - - |
250 - - |
270 - - |
290 - - |
310 - - |
|
| 11 0DE1 0DE2 |
31 3DE1 3DE2 |
51 0DP1 0DP2 |
71 3DP1 3DP2 |
91 0DE1 0DE2 |
111 3DE1 3DE2 |
131 0DP1 0DP2 |
151 3DP1 3DP2 |
171 0DE1 0DE2 |
191 3DE1 3DE2 |
211 0DP1 0DP2 |
231 3DP1 3DP2 |
251 0DE1 0DE2 |
271 3DE1 3DE2 |
291 0EBKL 3EBKL |
311 SyncF3 3PBKL |
TED Diff Energy | |
| 12 0DE3 0DE4 |
32 3DE3 3DE4 |
52 0DP3 0DP4 |
72 3DP3 3DP4 |
92 0DE3 0DE4 |
112 3ED3 3DE4 |
132 0DP3 0DP4 |
152 3DP3 3DP4 |
172 0DE3 0DE4 |
192 3DE3 3DE4 |
212 0DP3 0DP4 |
232 3DP3 3DP4 |
252 0DE3 0DE4 |
272 3DE3 3DE4 |
292 0PBKL 0PBKH |
312 Sync 50 3PBKH |
||
| 13 0EFL 3EFL |
33 - - |
53 - - |
73 - - |
93 - - |
113 - - |
133 - - |
153 - - |
173 - - |
193 - - |
213 - - |
233 - - |
253 - - |
273 - - |
293 - - |
313 - - |
TED Low Energy Flux | |
| 14 0PFL 3PFL |
34 - - |
54 - - |
74 - - |
94 - - |
114 - - |
134 - - |
154 - - |
174 - - |
194 - - |
214 - - |
234 - - |
254 - - |
274 - - |
294 - - |
314 - - |
||
| 15 0EFH 3EFH |
35 - - |
55 - - |
75 - - |
95 - - |
115 - - |
135 - - |
155 - - |
175 - - |
195 - - |
215 - - |
235 - - |
255 - - |
275 - - |
295 - - |
315 - - |
TED High Energy Flux | |
| 16 0EFH 3EFH |
36 - - |
56 - - |
76 - - |
96 - - |
116 - - |
136 - - |
156 - - |
176 - - |
196 - - |
216 - - |
236 - - |
256 - - |
276 - - |
296 - - |
316 - - |
||
| 17 0EM/0PM 0DEM |
37 - - |
57 - - |
77 - - |
97 - - |
117 - - |
137 - - |
157 - - |
177 - - |
197 - - |
217 - - |
237 - - |
257 - - |
277 - - |
297 - - |
317 - - |
TED PERK FLUX | |
| 18 0DPM 3EM/3PM |
38 - - |
58 - - |
78 - - |
98 - - |
118 - - |
138 - - |
158 - - |
178 - - |
198 - - |
218 - - |
238 - - |
258 - - |
278 - - |
297 - - |
318 - - |
||
| 19 3DEM 3DPM |
39 - - |
59 - - |
79 - - |
99 - - |
119 - - |
139 - - |
159 - - |
179 - - |
199 - - |
219 - - |
239 - - |
259 - - |
279 - - |
299 - - |
319 - - |
||
| 2 sec | 4 sec | 8 sec | 16 sec | 24 sec | 32sec | ||||||||||||
| Note: Dash indicates data is the same as in previous column. | |||||||||||||||||
| Particle Type | Sensor | DetectedEnergy Range | ReadoutTime(s) | Mnemonics |
|---|---|---|---|---|
| Proton | Telescope 0/90 Degrees |
30-80 keV | 2 | 0P1, 9P1 |
| 80-250 keV | 2 | 0P2, 9P2 | ||
| 250-800 keV | 2 | 0P3, 9P3 | ||
| 800-2500 keV | 2 | 0P4, 9P4 | ||
| 2500-7000 keV | 2 | 0P5, 9P5 | ||
| >7000 keV | 2 | 0P6, 9P6 | ||
| Electron | Telescope 0/90 Degrees |
≥30 keV | 2 | 0E1, 9E1 |
| ≥100 keV | 2 | 0E2, 9E2 | ||
| ≥300 keV | 2 | 0E3, 9E3 | ||
| Proton | Omni-directional | ≥16 MeV | 2 | P6 |
| ≥35 MeV | 2 | P7 | ||
| ≥70 MeV | 4 | P8 | ||
| ≥140 MeV | 4 | P9 |
| Definition (See Note 1) | Readout Time(s) | Mnemonics | Notes |
|---|---|---|---|
| 0.05-1 keV Partial Energy Flux | 2 | 0EFL, 0PFL, 3EFL, 3PFL | |
| 2-10 keV Partial Energy Flux | 2 | 0EFH, 0PFH, 3EFH, 3PFH | |
| Maximum Differential Energy Flux | 2 | 0DEM, 0EPM, 3DEM, 3DPM | |
| Energy of Maximum Differential Energy Flux | 2 | 0EM, 0PM, 3EM, 3PM | 2 |
| Four Point Energy/Flux Spectrum | 8 | 0DE1, 0DE2, 0DE3, 0DE4 3DE1, 3DE2, 3DE3, 3DE4 0DP1, 0DP2, 0DP3, 0DP4 3DP1, 3DP2, 3DP3, 3DP4 |
3,4 |
| Background | 32 | 03BKH, 0EBKL, 0PBKH, 0PBKL | |
| Notes: 1. Four sets of measurements are made: electrons at 0 degrees, protons at 0 degrees, electrons at 30 degrees and protons at 30 degrees. 2. Four bits each, combined into two data words (0EM/0PM and 3EM/3PM). 3. Differential energy channels 4, 8, 11 and 14 (based on 1-16). 4. The four-point proton spectra are read three times every 32 seconds. |
|||
Digital "A" data is clocked into the spacecraft TIP whenever the "A1" Data Enable Pulse is presented to the instrument. Digital "A" data include both instrument data and any housekeeping telemetry required for reduction of observation data. The data format differs with the various SBUV/2 operating modes as described below.
The instrument views the earth's atmosphere, or the sun if the diffuser is so deployed. In this mode, radiometric data is taken at twelve discrete wavelengths. The data format for this mode is shown in Table 4.3.4.3.1-1. Further details of the data format are provided in Tables 4.3.4.3.1-2, 4.3.4.3.1-3, 4.3.4.3.1-4, 4.3.4.3.1-5 and 4.3.4.3.1-6.
The instrument grating sweeps from approximately 400 nm to 160 nm, and data is taken in 0.15 nm increments. If SBUV/2 is viewing the earth, the scene spectral radiance is being measured. If the diffuser is deployed, the instrument is measuring the solar irradiance.
The instrument views an on-board Hg lamp source at 12 discrete grating positions bracketing a particular source line. The data format for this mode is the same as that for the Discrete Mode, as shown in Table 4.3.4.3.1-1.
| Line (See Note 3) | TIP Minor Frames (See Note 2) | Function | Sample Time | Integration Interval | |||
|---|---|---|---|---|---|---|---|
| Word 1 (See Note 4) | Word 2 (See Note 4) | Word 1 (See Note 7) | Word 2 | Word 1 | Word 2 | ||
| L0 | 0, 10,20,..., 310 | Status Word 1 | Range 1 Data | End of L0,Channel N-1 | End of L9, Channel N-1 | n/a | 1 1/4 sec and 1/4 sec (See Note 8) |
| L1 | 1, 11,21,..., 311 | Status Word 2 | Range 2 Data | Channel N-1 | End of L9, Channel N-1 | n/a | 1 1/4 sec and 1/4 sec (See Note 8) |
| L2 | 2, 12,22,..., 312 | Analog Sub Mux | Range 3 Data | End of L0/L1, Channel N | End of L9, Channel N-1 | 0.1 | 1 1/4 sec and 1/4 sec (See Note 8) |
| L3 | 3, 13,23,..., 313 | Memory Verify | 0000 | End of L1, Channel N | n/a | n/a | n/a |
| L4 | 4, 14,24,..., 314 | Status Word 3 | 0000 | Start of L0, Channel N | n/a | n/a | n/a |
| L5 | 5, 15,25,..., 315 | Status Word 4 | 0000 | Start of L0, Channel N | n/a | n/a | n/a |
| L6 | 6, 16, 26,...,316 | Grating Position | 0000 | 1/2 into L7 Alternates End of L9, Chan N-1 | n/a | n/a | n/a |
| L7 | 7, 17,27,..., 317 | CCR Data | 0000 | End of L9,Channel N-1 | n/a | 1 1/4 sec (See Note 8) and 1/4 sec | n/a |
| L8 | 8, 18,28,...,318 | RDCL/ GPE (See Note 6) |
0000 | End of L6/L7, Channel N | n/a | 0.1 sec | n/a |
| L9 | 9, 19, 29,...,319 | Frame Sync Code | 0000 | Start of L0, Channel N | n/a | n/a | n/a |
| Notes: 1) Includes discrete, calibration and position modes. 2) Format is the same for all major frames. 3) The basic SBUV/2 data frame is a 20-word block repeating at one second intervals. 4) Word 1 corresponds to the 16 bits in TIP words 36 and 37, MSB sent first. Word 2 corresponds to the 16 bits in TIP words 80 and 81, MSB sent first. 5) Analog sub-mux is 16 channels deep. 6) Radiometric DC level/grating position error. 7) Channel N is the present 1 second time interval. Channel N-1 is the previous 1 second time interval. 8) In every two second interval, signal integration occurs between 3/4 and 2 secs; signal is sampled and readout at the end of 1 sec and 2 secs. |
|||||||
| Name of Function | Format Location | Bit Numbers MSB LSB | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Word | Line | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ||||||||||||||||
| Frame Sync Code and Sub-multiplexer Channel Number | 1 | 9 | 23 | 22 | 20 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | |
| Frame Sync Sub-multiplexer Channel Numbers (Full Scale Counts 255=5.1 V, all analog channels) | ||||||||||||||||||
| Analog Sub-Mux (see Table 4.3.4.3.1-7 for commutation scheme) | 1 | 2 | Channel A | Channel B | ||||||||||||||
| 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | |||
| Radiometric DC Level/Grating Position Error (See Note 3) | 1 | 8 | Full Scale Counts 255=5.1 Volts, Note: RDCL F.S. Current 91.5 pa | |||||||||||||||
| Monochromator Range Data | 2 | 215 ------------------------------------------------------------------------------20 | ||||||||||||||||
| Maximum Count = 65,535 (See Note 1), Full Scale Counts = 65,536 | ||||||||||||||||||
| Full Scale Current | ||||||||||||||||||
| Disc | Sweep | |||||||||||||||||
| 0 | Range 1(See Note 2) | 100 pa | 1.25 na | |||||||||||||||
| 1 | Range 2(See Note 2) | 10 na | 125 na | |||||||||||||||
| 2 | Range 3(See Note 2) | 1 μa | >12.5 μa< | |||||||||||||||
| Cloud Cover Radiometer Data | 1 | 7 | CCR | 2.4 na | 30 na | |||||||||||||
| Memory Verification Repeats every 128 secs Reads memory as indicated by memory bits shown to right Memory location readout in order starting with Word 0 segment 0 of fixed memory at TIP major frame pulse. |
1 | 3 | 2 12 position data in Memory | 20 S1 S0 F | ||||||||||||||
| Segment | S1 | S0 | Program | F | ||||||||||||||
| 0 | 0 | 0 | Fixed | 1 | ||||||||||||||
| 1 | 0 | 1 | Flex | 0 | ||||||||||||||
| 2 | 1 | 0 | ||||||||||||||||
| 3 | 1 | 1 | ||||||||||||||||
| Grating Position Number greater than 0 = CW of Index, Number less than 0 = CCW of Index Index = all zeroes 1 bit CW = 0 1 bit CCW = all ones |
1 | 6 | 212 20 S1 S0 L | |||||||||||||||
| Segment Being Read | S1 | S0 | ||||||||||||||||
| 0 | 0 | 0 | ||||||||||||||||
| 1 | 0 | 1 | ||||||||||||||||
| 2 | 1 | 0 | ||||||||||||||||
| 3 | 1 | 1 | ||||||||||||||||
| This is the actual position number. Code is in 2's complement. Digital Lock L=1 (locked). | ||||||||||||||||||
| Range Identification | Status Words 1 and 2 |
Range Selected | Bit A | Bit B | ||||||||||||||
| R1 | 0 | 1 | ||||||||||||||||
| R2 | 1 | 0 | ||||||||||||||||
| v1 | ||||||||||||||||||
| Sweep Mode Major Frame Counter | Status Word 1 Bits 3,4 & 5 |
Frame | Count | Bit No. | ||||||||||||||
| 3 | 4 | 5 | ||||||||||||||||
| None | 0 | 0 | 0 | 0 | ||||||||||||||
| (First) | 1 | 0 | 0 | 1 | ||||||||||||||
| 2 | 2 | 0 | 1 | 0 | ||||||||||||||
| 3 | 3 | 0 | 1 | 1 | ||||||||||||||
| 4 | 4 | 1 | 0 | 0 | ||||||||||||||
| 5 | 5 | 1 | 0 | 1 | ||||||||||||||
| Notes: 1) Overflow flags (status 3 bits 1, 2, 3, 4). 2) Current referred to the PMT anode. 3) Grating Motor Current, Grating Position Error, and Grating Coarse Error are expected to always read 0 to 10 counts (telemetry points are grounded) and data should be disregarded. |
||||||||||||||||||
| Temperature Monitors:
1. Differential Monitors TD=TA-TR; NA=NR +0.1075 ND-13.7 (See Note 1) 2. Single Pt Monitors: |
||||||
| Temperature (Degrees C) | Thermistor (Ohms) | Output Volts/Counts (N) | ||||
|---|---|---|---|---|---|---|
| Shroud -30 to 80 | Differential A to B Reference | 0 to 80 degrees | -15 to 45 degrees | -5 to 35 degrees | ||
| -30 | 135.2 K | 4.74/237 | ||||
| -20 | 78.91 K | 4.57/228 | 5.15 | |||
| -15 | 61.02 K | 4.45/222 | 3.58/179 | 5.01/250 | ||
| -10 | 47.54 K | 4.32/216 | 3.41/170 | 5.513 | 4.84/242 | 5.17 |
| -5 | 37.31 K | 4.16/208 | 3.22/161 | 4.95/247 | ||
| 0 | 29.49 K | 3.99/199 | 3.01/150 | 4.98/249 | 4.42/221 | 4.70/235 |
| 5 | 23.46 K | 3.79/189 | 2.79/140 | |||
| 10 | 18.79 K | 3.57/178 | 2.57/128 | 4.35/217 | 3.92/196 | 4.13/206 |
| 15 | 15.13 K | 3.34/167 | 2.33/117 | |||
| 20 | 12.26 K | 3.10/155 | 2.11/105 | 3.67/183 | 3.36/166 | 3.52/176 |
| 25 | 10.00 K | 2.86/143 | 1.89/94 | 3.33/167 | 3.08/154 | |
| 30 | 8.194 K | 2.61/130 | 1.68/84 | 3.00/150 | 2.79/139 | 2.90/145 |
| 35 | 6.752 K | 2.37/118 | 1.48/74 | 2.60/130 | ||
| 40 | 5.592 K | 2.14/107 | 1.30/65 | 2.39/119 | 2.25/112 | 2.32/116 |
| 45 | 4.655 K | 1.91/95 | 1.14/57 | 2.01/100 | ||
| 50 | 3.893 K | 1.71/85 | 1.86/93 | 1.78/89 | 1.82/91 | |
| 60 | 2.76 K | 1.35/67 | 1.44/72 | 1.39/69 | 1.41/70 | |
| 70 | 1.99 K | 1.05/52 | 1.1/55 | 1.08/54 | 1.09/54 | |
| 80 | 1.458 K | 0.81/41 | 0.85/42 | 0.831/41 | ||
| Note: 1. NA = Thermistor "A" Temperature in counts, ND = Differential Temperature in counts and NR = Reference Temperature in counts. |
||||||
| Voltage Monitors | |
|---|---|
| Function | Conversion Factor |
| HVPS Volts | 6 V/N (See Note 1) |
| E Cal Ref | 0.04 V/N, 6.4 V/160 Counts Nominal, ± 0.6 V limits |
| 15 V Sensors | 0.1 V/N, 15 V/150 Counts Nominal, ± 3.0 V limits |
| -15 V Sensors | V=0.6083 N5 - 0.5059 N15 (See Note 2) |
| 24 V Motor | 0.198 V/N, 24 V/121 Counts Nominal, ± 5 V limits |
| 5 V LED | 0.0333 V/N, 5V/150 Counts Nominal, ± 1 V limits |
| 10 V Logic | 0.0667 V/N, 10 V/150 Counts Nominal, ± 1 V limits |
| 28 V (See Note 1) | 9.912 V/N, 28V/2.82 V Nominal ±4 V limits |
| 25 V | 0.198 V/N, 25 V/126 Counts Nominal, ± 2.5 V limits |
| 15 V Servo | 0.1 V/N, 15 V/150 Counts Nominal, ±1.5 V limits |
| -15 V Servo | V=0.6083 N5 - 0.5059 N15 (See Note 2) |
| Thermistor Bias (10 V) | 0.0667 V/N, 10 V/150 Counts Nominal, ±1 V limits |
| Current Monitors | |
| Chop Motor | 0.002 A/N |
| Diffuser Motor | 0.004 A/N |
| Cal Lamp Current | 5.22 μA/N |
| Lamp Motor | 0.004 A/N |
| Cal Lamp Heater | 0.1 A/volt 0.17 A nominal |
| Miscellaneous | |
| Chopper Phase Error | 0.0985 V/N |
| Note: 1. Analog Telemetry 2. N=counts, N5 counts from 5V LED, N15 counts from 15V LED |
|
| Command (CMD) Sequence State | |||||
|---|---|---|---|---|---|
| 22 | 21 | 20 | |||
| Discrete Sun Command Sequence | 1-0 | 0 | 0 | 0 | Discrete Sun Enable ON |
| 1-1 | 0 | 0 | 1 | ||
| 1-2 | 0 | 1 | 0 | ||
| All other states not valid | |||||
| Sweep Sun Command Sequence Step No. | 2-0 | 0 | 0 | 0 | Sweep Sun Enable ON |
| 2-1 | 0 | 0 | 1 | ||
| 2-2 | 0 | 1 | 0 | ||
| 2-3 | 0 | 1 | 1 | ||
| All other states not valid | |||||
| W/L (See Note 1)Calibration Command Sequence Step No. | 3-0 | 0 | 0 | 0 | W/L Calibration Enable ON |
| 3-1 | 0 | 0 | 1 | ||
| 3-2 | 0 | 1 | 0 | ||
| 3-3 | 0 | 1 | 1 | ||
| 3-4 | 1 | 0 | 0 | ||
| 3-5 | 1 | 0 | 1 | ||
| 3-6 | 1 | 1 | 0 | ||
| 3-7 | 1 | 1 | 1 | ||
| All other states not valid | |||||
| Note: 1. W/L= wavelength |
|||||
| Timing Monitors | ||||
|---|---|---|---|---|
| E Cal Step No. | 16 sec | 8 sec | 4 sec | Retrace |
| A | 1 | 0 | 0 | ON |
| B | 1 | 0 | 1 | |
| C | 1 | 1 | 0 | |
| D | 1 | 1 | 1 | |
| E | 0 | 0 | 0 | |
| A | 0 | 0 | 1 | |
| A | 0 | 1 | 0 | |
| A | 0 | 1 | 1 | |
| E Cal OFF | OFF | |||
| Note: Timing monitors are sampled at Channel N-1 (1 sec prior to readout). | ||||
| Bits 1 through 8 Channel A | Bits 9 through 16 Channel B | ||
|---|---|---|---|
| Channel # | Function | Channel # | Function |
| 1A | Chop Motor Current | 1B | Spare |
| 2A | Differential Motor Current | 2B | Diffuser Plate Temperature (See Note 1) |
| 3A | HVPS Volts | 3B | SM Baseplate Temperature (See Note 2) |
| 4A | Thermistor Bias (10 V Reference) | 4B | 25 V Power Volts |
| 5A | Calibration Lamp Temperature (See Note 1) | 5B | 15 V Servo Volts |
| 6A | Electronic Calibration Reference Volts | 6B | -15 V Servo Volts |
| 7A | 15 V Sensors Volts | 7B | CCR Diode Temperature (See Note 3) |
| 8A | -15 V Sensors Volts | 8B | SM Differential Temperature Y Axis (See Note 4) |
| 9A | 24 V Motor Volts | 9B | SM Differential Temperature Z Axis (See Note 4) |
| 10A | 5 V LED Volts | 10B | Differential Reference Temperature Z Axis |
| 11A | 10 V Logic Volts | 11B | Differential Reference Temperature Y Axis |
| 12A | Calibration Lamp Current | 12B | PMT Cathode Temperature (See Note 3) |
| 13A | Spare | 13B | Spare |
| 14A | Signal Return | 14B | Chopper Phase Error |
| 15A | Signal Return | 15B | Spare |
| 16A | Lamp Motor Current | 16B | Spare |
| Notes: 1. 0 to 80 degrees C 2. -15 to 45 degrees C 3. -5 to 35 degrees C 4. ± 5 degrees C |
|||
| Previous Section | Top of Page | Next Section |