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NOAA KLM User's GuideSection 8.3.1.9.3.4 |
Introduction Page, NOAA KLM TOC,
AcronymsIf the mode code in the MHS data stream is missing or corrupt, the mode of the instrument (and therefore the type of packet) is unknown. If this is the case, the packet data is placed into this field without modification. The MHS unknown packet is documented in Table 8.3.1.9.3.4-1. See the legend in Section 8.3.1.1 for further explanation of the headings on this table.
| Field Name | Start Octet |
End Octet |
Data Type |
Word Size |
Number of Words |
Scale Factor |
Units | Notes |
|---|---|---|---|---|---|---|---|---|
| SCAN LINE INFORMATION | ||||||||
| Scan Line Number (cumulative, starting with 1) | 1 | 2 | u | 2 | 1 | 0 | ||
| Scan Line Year (four digits, e.g., 2000) | 3 | 4 | u | 2 | 1 | 0 | ||
| Scan Line Day of Year (e.g., 365) | 5 | 6 | u | 2 | 1 | 0 | ||
| Satellite Clock Drift Delta | 7 | 8 | i | 2 | 1 | 0 | milliseconds | |
| Scan Line UTC Time of Day | 9 | 12 | u | 4 | 1 | 0 | milliseconds | |
| Scan Line Bit Field bit 15: satellite direction (0=northbound; 1=southbound) bit 14: clock drift correction (0=not corrected; 1=scan time corrected for clock drift) bits 13-0: <zero fill> |
13 | 14 | u | 2 | 1 | 0 | ||
| Major Frame Count (cumulative, starting with 1) | 15 | 16 | u | 2 | 1 | 0 | ||
| Coarse MHS On-board Time (OBT) (time since last reset to zero) | 17 | 20 | u | 4 | 1 | 0 | seconds | |
| Fine MHS OBT (fraction of second since last increment of coarse MHS OBT. Resolution: 2-16 seconds; range: 0 - 65,535.) | 21 | 22 | u | 2 | 1 | 0 | ||
| MHS Mode Flag 0=power on ("empty" mHS science data) 1=warm up ("empty" MHS science data) 2=standby ("empty" MHS science data) 3=scan (valid MHS science data) 4=fixed view (valid MHS science data, but instrument is viewing a fixed location) 5=self-test (test data) 6=safeing ("empty" MHS science data) 7=fault ("empty" MHS science data) 8-14=<undefined> (unknown data) 15=memory dump (memory dump data) |
23 | 23 | u | 1 | 1 | 0 | ||
| <Zero Fill> | 24 | 24 | i | 1 | 1 | 0 | ||
| QUALITY INDICATORS | ||||||||
| Quality Indicator Bit Field (if a bit is on (=1), the statement is true) bit 31: do not use scan for product generation bit 30: time sequence error detected within this scan (see below) bit 29: data gap precedes this scan (gap may be due to actual lost scans or scans in which the TIP or MIU are in non-nominal modes) bit 28: insufficient data for calibration (see below) bit 27: earth location data not available (see below) bit 26: first good time following a clock update (nominally 0) bit 25: instrument status changed with this scan bits 24 - 5: <zero fill> bit 4: transmitter status change occurred (see note 2) bit 3: AMSU sync error detected bit 2: AMSU minor frame error detected bit 1: AMSU major frame error detected bit 0: AMSU parity error detected |
25 | 28 | u | 4 | 1 | 0 | 2 | |
| Scan Line Quality Flags [Time Problem Code] (If a bit is on (=1),
the statement is true. All bits off implies the scan time is as
expected.) bit 7: time field is bad but can probably be inferred from the previous good time bit 6: time field is bad and can't be inferred from the previous good time bit 5: this record starts a sequence that is inconsistent with previous times (i.e., there is a time discontinuity). This may be associated with a spacecraft clock update. (See bit 26, Quality Indicator Bit Field.) bit 4: start of a sequence that apparently repeats scan times that have been previously accepted bits 3-0: <zero fill> |
29 | 29 | u | 1 | 1 | 0 | ||
| <Zero Fill> | 30 | 1480 | i | 1 | 1451 | 0 | ||
| UNKNOWN PACKET DATA | ||||||||
| Packet Data | 1481 | 2766 | u | 1 | 1286 | 0 | 3 | |
| <Zero Fill> | 2767 | 2834 | i | 2 | 34 | 0 | ||
| DISCRETE TELEMETRY (Equivalent to digital B and analog housekeeping telemetry in other instruments.) |
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| Main Bus Select Status (indicate which main bus (A or B) is used by the MHS) 1 (0V) = A bus (relay closed) 0 (5V) = B bus (relay opened) |
2835 | 2835 | u | 1 | 1 | 0 | 1 | |
| MHS Survival Heater 1=on 0=off |
2836 | 2836 | u | 1 | 1 | 0 | 1 | |
| RF Converter Protect Disable 1=no 0=yes |
2837 | 2837 | u | 1 | 1 | 0 | 1 | |
| MHS Power A 1=on 0=off |
2838 | 2838 | u | 1 | 1 | 0 | 1 | |
| MHS Power B 1=on 0=off |
2839 | 2839 | u | 1 | 1 | 0 | 1 | |
| Main Converter Protect Disable 1=no 0=yes |
2840 | 2840 | u | 1 | 1 | 0 | 1 | |
| Survival Temperatures Word 1: Receiver temperature Word 2: Electronics equipment temperature Word 3: Scan mechanism temperature |
2841 | 2846 | u | 2 | 3 | 0 | counts | 1 |
| Transmitter Telemetry Word 1: STX-1 status Word 2: STX-2 status Word 3: STX-3 status Word 4: STX-4 status Word 5: STX-1 power Word 6: STX-2 power Word 7: STX-3 power Word 8: SARR-A power Word 9: SARR-B power |
2847 | 2864 | u | 2 | 9 | 0 | counts | 1 |
| Discrete Telemetry Update Flags (If bit =0, associated telemetry item is up-to-date. If bit=1,
associated telemetry item was not updated during most recent telemetry cycle - possibly due to lost frame.) bits 31-18: <zero fill> bit 17: SARR-B power bit 16: SARR-A power bit 15: STX-3 power bit 14: STX-2 power bit 13: STX-1 power bit 12: STX-4 status bit 11: STX-3 status bit 10: STX-2 status bit 9: STX-1 status bit 8: Scan mechanism temperature bit 7: Electronics equipment temperature bit 6: Receiver temperature bit 5: Main converter protect disable bit 4: MHS power B bit 3: MHS power A bit 2: RF converter protect disable bit 1: MHS survival heater bit 0: Main bus select status |
2865 | 2868 | u | 1 | 4 | 0 | 1 | |
| FILLER | ||||||||
| <Zero Fill> | 2869 | 3072 | i | 2 | 102 | 0 | ||
| NOTES: 1) The MHS Level 1b will not contain any MIU-related analog or digital B telemetry items from the NOAA data stream. These items will be archived in a separate NOAA telemetry file. 2) The RFI bias correction data is based on experience with the AMSU-B instrument from the NOAA KLM series of satellites. While it may not be necessary, it is being left in the MHS Level 1b format. Unitl a determination is made that it is necessary, it will be zero filled. 3) The mode of the instrument and therefore the type of packet is unknown if the mode code in the data stream is either missing (due to a missing minor frame, for example) or corrupt (i.e., set to one of the "unused" values). In the event of an unknown mode/packet, the packet data is placed into this field without modification. |
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