NOAA KLM User's Guide

Section 4.3

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4.3 Direct Sounder Broadcast (DSB)

4.3.1 General

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.

4.3.2 DSB Transmission Characteristics

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.

Table 4.3.2-1. DSB Transmission Characteristics.
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

Table 4.3.2-2. TIP Parameters.
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

4.3.3 TIP Frame Format

The TIP format is based on a major frame which contains 320 minor frames.

4.3.3.1 TIP Minor Frame Format for NOAA KLM

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.

Figure 4.3.3.1-1. TIP Output Format (Orbit Mode) for NOAA KLM.
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.
Table 4.3.3.1-1. TIP Minor Frame Format for NOAA KLM.
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

4.3.3.2 TIP Minor Frame Format for NOAA-N,-P

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.

Figure 4.3.3.2-1. TIP Output Format (Orbit Mode) for NOAA-N,-P.
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 - 53
DCS-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.
Table 4.3.3.2-1. TIP Minor Frame Format for NOAA-N,-P.
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

4.3.4 DIGITAL "A" TELEMETRY

4.3.4.1 HIRS

4.3.4.1.1 HIRS/3

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.

Table 4.3.4.1.1-1. Digital "A" Status Telemetry.
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
58
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.
61
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.
62
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.

Table 4.3.4.1.1-2. Digital "A" Status Telemetry (Element 63, Status Words).
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

4.3.4.1.2 HIRS/4

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.

Table 4.3.4.1.2-1. HIRS/4 Digital A Data Output Format.
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    
59
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    
60
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.

4.3.4.2 SEM-2

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.

Table 4.3.4.2-1. SEM Digital "A" Telemetry Data Assignments.
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
-
-
MEPED 0 degree Telescope
  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.

Table 4.3.4.2-2. MEPED Digital "A" Data.
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
Table 4.3.4.2-3. TED Digital "A" Data.
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.

4.3.4.3 SBUV/2

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.

4.3.4.3.1 Discrete Mode

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.

4.3.4.3.2 Sweep Mode

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.

4.3.4.3.3 Wavelength Calibration Mode

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.

Table 4.3.4.3.1-1. SBUV/2 Data Format Discrete Modes (See Note 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.
Table 4.3.4.3.1-2. SBUV/2 Data Format Discrete Mode Detailed Description.
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
R3
1
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
6 (Last)
6
1
1
0
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.


Table 4.3.4.3.1-3. SBUV/2 Data Format Discrete Mode Temperature Monitor Description.
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.
Table 4.3.4.3.1-4. SBUV/2 Data Format Discrete Mode Voltage and Current Monitors Description.
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
Table 4.3.4.3.1-5. SBUV/2 Description of Command Sequence State Monitors.
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


Table 4.3.4.3.1-6. SBUV/2 Data Description of the Electronic Calibration Step Decoding using Timing Monitors and the Retrace Monitor.
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).


Table 4.3.4.3.1-7. SBUV/2 Data Format Discrete Mode Analog Sub-Multiplexer Data Assignment.
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

Amended March 10, 2004


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