**POLAR Spacecraft Status As of: Thurs 21 Feb 2008, 12:00 EST**

*(Changes* from last week in bold border)

+----------+--------------+--------------+--------------+--------------+
| **Subs   | **NOAA-15K** | **NOAA-16L** | ##           | ##           |
| ystem/** |              |              | ### NOAA-17M | ### NOAA-18N |
|          | AM: 17:49=AN | PM: 15:04=AN |              |              |
| **Com    |              |              | AM: 22:23=AN | PM 13:49=AN  |
| ponent** | GAC data     | GAC data     |              |              |
|          | only         |              | GAC&LAC data | GAC & LAC    |
|          |              |              |              | data         |
+==========+==============+==============+==============+==============+
| **LA     | 05/13/98     | 09/21/00     | 6/24/02      | ####         |
| UNCHED** |              |              |              | ### 5/20/05  |
+----------+--------------+--------------+--------------+--------------+
| **CNTL   | OBP2         | OBP2         | OBP2         | OBP2         |
| OBP**    |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **BUS**  | B-BUS        | B-BUS        | B-BUS        | B-BUS        |
|          |              |              |              |              |
|          | XSU-1        | XSU-2:       | XSU-2: TOAR  | XSU-1        |
|          |              | TOAR472      | 471          |              |
|          |              |              |              |              |
|          |              |              | 1/15/08      |              |
+----------+--------------+--------------+--------------+--------------+
| **BUS    | NO           | NO           | NO           | NO           |
| VETO**   |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| *        | [Nominal     | ######       | ###### [N    | [Nominal     |
| *ADACS** | Mode]        | [RGYRO Mode] | ominal Mode] | Mode]        |
|          | {.underline} | {.underline} | {.underline} | {.underline} |
|          |              |              |              |              |
|          | Rg           | Estimate     | Rg           | Gyro-A       |
|          | mode=Monitor | Y-ROLL       | mode=Monitor | MIMU-2       |
|          |              |              |              |              |
|          | Gyro-3 Off   | Rg           | Gyro-3 Off   | Z-wheel      |
|          | 6/26/00 Gyro | mode=PASSIVE | 6/10/04      | -Pitch       |
|          | chans=AAB    |              |              |              |
|          |              | Gyros-1 & 3  | Gyro         | TOAR 447     |
|          | N2 Low PSI   | Inop/Off     | chans=AAB    |              |
|          | invalid      |              | GAS Enabled  | Z-momentum   |
|          |              | Gyro chans   | Dec 05       | transition   |
|          |              | XA-ZB        |              | complete     |
|          |              |              |              |              |
|          |              | Pitch wheel  |              | Pitch        |
|          |              | bias 2400    |              | Torquer      |
|          |              |              |              | again active |
|          |              | Gyro2 safe   |              |              |
|          |              | macro        |              |              |
+----------+--------------+--------------+--------------+--------------+
| **RXO**  | PRI          | PRI          | PRI          | PRI          |
|          |              |              |              |              |
|          | daily bias   | Daily Bias   | Daily Bias   | No daily     |
|          | -8 mS        | --5.5 mS     | --3 mS       | bias         |
|          |              |              |              |              |
|          | -500 mS      | -1500 mS     | -1500 mS     | -1500 mS     |
|          | 12/31/05     | 31Dec05      | 31Dec05      | 31Dec05      |
+----------+--------------+--------------+--------------+--------------+
| **CLOCK  | 2            | 2            | 2            | 2            |
| DIV**    |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **MIRP** | External     | External     | External     | External     |
|          | Synch        | Sync         | Sync         | Synch        |
|          | Rephase 0730 |              |              |              |
|          | daily        | Rephase each | Rephase      | Rephase      |
|          |              | orbit        | Enabled      | Enabled      |
+----------+--------------+--------------+--------------+--------------+
| **TIP    | 2            | 2            | 2            | 1            |
| SIDE**   |              |              |              |              |
|          | (since       | since        | Swapped      | Analog telem |
|          | 4/3/03)      | 4/18/05      | 9/20/06      | drifting     |
|          |              |              |              |              |
|          | 3 channels   | (analog      |              |              |
|          | inop         | drifting?)   |              |              |
+----------+--------------+--------------+--------------+--------------+
| **Rec    | DTRs 1, 2,   | DTRs 1, 2,   | DTR 1,3,4 /  | SSRs         |
| orders** | 3, 4         | 3, 4A        | SSR 2        | 1,2,3,4,5    |
|          | Safestate 1B |              |              |              |
| **(DTR,  | EOT          | Safestate 3A | S            | Safestate=5B |
| SSR)**   |              |              | afestate=SSR |              |
|          |              | 4B STIP only | 2B           | Current      |
|          |              |              |              | spikes       |
|          |              |              | 4A Pressure  |              |
|          |              |              | leak         |              |
+----------+--------------+--------------+--------------+--------------+
| **VTX**  | #1 ON        | OFF / INOP   | #2 ON        | #1 ON        |
|          |              |              |              |              |
| (APT     | As of 19     | since        | 137.62 MHZ   | 137.1 MHZ    |
| data)    | June 07      | 11/15/00     |              |              |
|          |              |              |              | As of 16 Aug |
|          |              |              |              | 07           |
+----------+--------------+--------------+--------------+--------------+
| **BTX**  | #1           | #2           | ####### #2   | #1           |
|          |              |              |              |              |
|          | 137.35 MHZ   | 137.77 MHZ   | 137.77 MHZ   | 137.35 MHZ   |
+----------+--------------+--------------+--------------+--------------+
| **STX**  | 2-Omni HRPT  | 2 -- HRPT    | 2 -- HRPT    | 1 - HRPT     |
|          |              |              |              |              |
| 1 = rcp  | 2 Omni=rcp   | 1-- Playback | TOAR424 low  | 3 - Playback |
| 1698.0   |              |              | power        |              |
| mhz      | Power TOAR   | 4 Restored   |              | 2-Playback   |
|          | 446          | -11 Oct 2007 | 2 & 1        |              |
| 2 = lcp  |              |              | Playback     | 4-Test &     |
| 1702.5   | 4-Playback   | 3 low power  |              | Standby      |
| mhz      |              | INOP -10 Aug | STX-1 Power  |              |
|          | 1,           | 2007         | drop         |              |
| 3= rcp   | 2,3-Degraded |              |              |              |
| 1707.0   |              |              | STX-4        |              |
| mhz      |              |              | nominal      |              |
|          |              |              |              |              |
| 4= rcp   |              |              | STX-3 Failed |              |
| 2247.5   |              |              | 2/14/08      |              |
| mhz      |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| #        | [Array Off   | [Array Off   | [Array Off.  | [Array Off.  |
| ## POWER | -45]         | -20]         | --40]        | -40]         |
|          | {.underline} | {.underline} | {.underline} | {.underline} |
| (Array   |              |              |              |              |
| offset   | [Since       | [Since       | [Since       | [Since       |
| and CANT | 1/25/01]     | 9/13/]{.     | 1/29/04]     | 6/6/05]      |
| angle,   | {.underline} | underline}07 | {.underline} | {.underline} |
| eclipse  |              |              |              |              |
| states   | Full Sun     | Eclipse all  | Eclipse all  | Eclipse all  |
| and sun  |              | year         | year         | year         |
| angle)   | Sun Angle 13 |              |              |              |
|          |              | Sun Angle 34 | Sun Angle at | Sun Angle 63 |
|          | Uptrend to   |              | 66           | uptrend to   |
|          | 18 early Jan | Steady trend |              | 65 on        |
|          | 07           |              | Steady trend |              |
|          |              | SA CANT=22   |              | 1 Jan 07     |
|          | SA CANT=37   | degs         | SA CANT=37   |              |
|          | degs         |              | degs         | SA CANT=22   |
|          |              | Full sun S/C |              |              |
|          |              | in Sept 07   | BVR Phase    | BVR Phase    |
|          |              |              | Control      | Control      |
|          |              | BVR Phase    | auton swap   | auton swap   |
|          |              | Control      | 9/17/07      | 3/29/06 &    |
|          |              | auton swap   |              | 1/4/07       |
|          |              | 7/19/07      | Swap back    |              |
|          |              |              | 9/18/07      |              |
|          |              |              |              |              |
|          |              |              | SADPOS       |              |
|          |              |              | Enabled      |              |
|          |              |              | 2/12/08      |              |
+----------+--------------+--------------+--------------+--------------+
| *        | Nominal      | Nominal      | ### Nominal  | Nominal      |
| *AVHRR** |              |              |              |              |
|          | Channel 3B   | Recent SM    | 3A-B switch  | Channel 3B   |
|          | only         | current      | enabled      | only         |
|          |              | increases    |              |              |
|          | Occasional   |              | Previous     | Scan motor   |
|          | minor scan   | TCE24 OFF    | scan motor   | current drop |
|          | motor        | 4/14/04      | current mini | 29 Aug 06    |
|          | i            |              | surges       |              |
|          | nstabilities | Channel 3B   |              |              |
|          |              | only         |              |              |
+----------+--------------+--------------+--------------+--------------+
| **A      | Operational  | Operational  | OFF/INOP     | Nominal      |
| MSU-A1** |              |              |              |              |
|          | Ch14         | Primary PLLO | Since        | Full Scan    |
|          | inoperative  | chans 9-14   | 10/30/03     | mode         |
|          |              | bias shift.  |              |              |
|          | Ch11         |              | Survival     |              |
|          | inoperative  | Backup PLLO  | heat on.     |              |
|          |              | inop.        |              |              |
|          |              |              |              |              |
|          |              | Channel 9-14 |              |              |
|          |              | noise        |              |              |
+----------+--------------+--------------+--------------+--------------+
| **\`A    | Nominal      | Nominal      | Nominal      | Non-nominal  |
| MSU-A2** |              |              |              |              |
|          |              |              |              | DIG-A Temps  |
|          |              |              |              | erratic      |
|          |              |              |              | 2/7/08       |
|          |              |              |              |              |
|          |              |              |              | Cold Cal Pos |
|          |              |              |              | 2 2/21/08    |
+----------+--------------+--------------+--------------+--------------+
| **       | Operational  | Operational  | Nominal      | ***Replaced  |
| AMSU-B** |              |              |              | by MHS***    |
|          | Bias in All  | Space        |              |              |
|          | Chans.       | Position-3   |              |              |
|          |              |              |              |              |
|          | Degraded     | Chan-8       |              |              |
|          | Chan-3       | degradation  |              |              |
+----------+--------------+--------------+--------------+--------------+
| ### HIRS | NOMINAL      | NOMINAL      | NOMINAL      | ########     |
|          |              |              |              | Operational  |
|          | FW Abrupt    | New all time | 1 Pixel      |              |
|          | return to    | high filter  | cross-track  | Filter Heat  |
|          | nominal      | motor        | m            | OFF.         |
|          | 7/12/05      | current      | isalignment. |              |
|          |              | reached      |              | ########     |
|          | After years  | 9/17/06.     |              |  LW channel  |
|          | of minor and |              |              | 1-12 noise T |
|          | major        | Imagery      |              | OAR 448 Loos |
|          | current      | occasionally |              | e LWIR lens. |
|          | surges       | exhibits     |              |              |
|          |              | high levels  |              | LW imagery   |
|          | FW mode=Hi   | of           |              | erratic.     |
|          | Powr         | radiometric  |              |              |
|          |              | noise        |              |              |
+----------+--------------+--------------+--------------+--------------+
| ###      |              |              |              | Nominal      |
|  MHS/MIU |              |              |              |              |
|          |              |              |              | Fly Wheel    |
|          |              |              |              | Motor        |
|          |              |              |              | Current      |
|          |              |              |              | Spiking but  |
|          |              |              |              | not alarming |
|          |              |              |              | since 27 Dec |
|          |              |              |              | 06           |
|          |              |              |              |              |
|          |              |              |              | Entered      |
|          |              |              |              | Motor Spin   |
|          |              |              |              | State on 17  |
|          |              |              |              | Jan 08       |
|          |              |              |              |              |
|          |              |              |              | H4 gain      |
|          |              |              |              | increased 2  |
|          |              |              |              | Oct 07       |
|          |              |              |              |              |
|          |              |              |              | H3 gain      |
|          |              |              |              | increased    |
|          |              |              |              | 31Oct 07     |
+----------+--------------+--------------+--------------+--------------+
| **DCS**  | Nominal      | Nominal      | Nominal      | Nominal      |
|          |              |              |              |              |
| RFI      |              | Pseudo       |              | DRU's 1-7 On |
| inves    |              | message      |              |              |
| tigation |              | turned on    |              | DRU8         |
|          |              | 1/5/06       |              | inop/off     |
+----------+--------------+--------------+--------------+--------------+
| **SARR** | Operational  | Operational  | Nominal      | Nominal      |
|          |              |              |              |              |
|          | B-Side, 13   | Mode =AA     | A-side       | A-Side       |
|          | Dec 07       |              |              |              |
|          |              | A-side, AGC  | All AGC Mode | All AGC Mode |
|          | AGC Mode     | Mode         |              |              |
|          |              |              |              | Since 15 Aug |
|          | Intermittent | (B-side in   |              | 05           |
|          | failures for | FG mode)     |              |              |
|          | 243MHz A&B   |              |              |              |
|          |              | 243 MHz =    |              |              |
|          |              | INOP.        |              |              |
+----------+--------------+--------------+--------------+--------------+
| **SARP** | Nominal      | Nominal      | Nominal      | Nominal      |
|          |              |              |              |              |
|          | RCVR B/W = 2 | RCVR B/W = 2 |              | A-side 23    |
|          |              |              |              | May05        |
+----------+--------------+--------------+--------------+--------------+
| **SEM**  | Nominal      | Nominal      | Nominal      | Nominal      |
|          |              |              |              |              |
|          | E            | E            | E            | El           |
|          | -CDEM-HVPS=2 | -CDEM-HVPS=7 | -CDEM-HVPS=2 | ec-CH-HVPS=1 |
|          |              |              |              |              |
|          | P            | P            | P            | 27 June 06   |
|          | -CDEM-HVPS=0 | -CDEM-HVPS=7 | -CDEM-HVPS=4 | 17:00z       |
|          |              |              |              |              |
|          |              | 11 Jan       | 27 June 06   | Pr           |
|          |              | 0714:47z     | 16:00z       | ot-CH-HVPS=1 |
|          |              |              |              |              |
|          |              |              |              | 11 Jan 07    |
|          |              |              |              | 14:15z       |
+----------+--------------+--------------+--------------+--------------+
| **SBUV** |              | Operational  | Nominal      | Nominal      |
|          |              |              |              |              |
|          |              | Degraded     | Anode Mode   | Anode mode   |
|          |              | Ozone data   |              |              |
|          |              |              | Plan sweep   | since 6 July |
|          |              | Backup       | mode         | 05 13:30z    |
|          |              | Diffuser     |              |              |
|          |              | inop         | Standard Ops | Electronics  |
|          |              |              |              | turnoff      |
|          |              | Primary      | TOAR 463 sun | taken out of |
|          |              | Diffuser     | glint        | STESM        |
|          |              | deployment   |              | safestate    |
|          |              | problem TOAR | IBSL test    | table        |
|          |              | 426          | performed 12 |              |
|          |              |              | Sept 06      | TOAR 462 sun |
|          |              | AMSU EMI     |              | glint        |
|          |              | causing      | Grating      |              |
|          |              | erratic      | motor        |              |
|          |              | Behavior in  | i            |              |
|          |              | PMT cathod,  | nvestigation |              |
|          |              | range 3      |              |              |
+----------+--------------+--------------+--------------+--------------+
| **       |              | ON           | ON           | ON           |
| SADPOS** |              |              |              |              |
|          |              | Enabled      | ENABLED      | Enabled      |
|          |              | MFactor50%   |              |              |
|          |              |              | Timer =      | Timer =12    |
|          |              | Timer = 12   | 12mins       | mins         |
|          |              | mins         |              |              |
+----------+--------------+--------------+--------------+--------------+
| **T      | TCE26 & 15H  | Nominal      | TCE3H Batt   | All TCE's    |
| HERMAL** |              |              | 2A heater    | active       |
|          | Telem valid  | TCE24 OFF    | failed ON,   |              |
| Heaters, |              | 4/14/05      | turned off   | HIRS filter  |
| louvers  | TOAR 432     |              | 8/26/03      | heater       |
|          | closed       | (AVHRR H&L)  |              | turned OFF   |
| TCE's    |              |              | AMSU-A1      | 9/28/06      |
|          | TCE24L&25L   | HIRS Filter  | survival     |              |
|          | (HIRS &      | heater       | heaters on   |              |
|          | AVHRR)       | turned OFF   | 10/29/03     |              |
|          | failed       | 1/18/05      |              |              |
|          | 5/13/98      |              |              |              |
|          |              |              |              |              |
|          | RCE          |              |              |              |
|          | thermostat   |              |              |              |
|          | failed       |              |              |              |
|          | 5/13/98      |              |              |              |
|          |              |              |              |              |
|          | Spacecraft   |              |              |              |
|          | in thermal   |              |              |              |
|          | uptrend      |              |              |              |
+----------+--------------+--------------+--------------+--------------+

**COMMENTS/CHANGES:**

MISC: Due to NOAA-17 STX-3 failure, NOAA-18 & 17 STX configurations will
be changed per the table below on 26 Feb 2008:

  ---------------- ---------------------- ---------------- ----------------
  **Spacecraft**   **HRPT Broadcast**     **Playback       **Time of
                                          transmitters**   change**

  NOAA-17\*        STX-1\                 STX-2\           Rev:29485\
                   1698.0 Mhz             STX-4            Time:01:01:15z

  NOAA-18\*        STX-3\                 STX-1\           Rev:14265\
                   1707.0 Mhz             STX-2            Time:00:35:30z

  NOAA-15          STX-2 (OMNI) 1702.5    STX-4            No change
                   Mhz                                     

  NOAA-16          STX-2\                 STX-1            No change
                   1702.5 Mhz/LCP                          
  ---------------- ---------------------- ---------------- ----------------

NOAA-15: There were relatively no changes to the NOAA-15 payload health
situation during the past week.

NOAA-15 IMU status is unchanged. Daily monitoring continues.

NOAA-16: There was relatively no change in the performance of the
NOAA-16 payload or bus subsystems during the past week.

NOAA-17: There was relatively no change in the performance of the
NOAA-17 payload or bus subsystems during the past week.

NOAA-18: There were relatively no changes to the NOAA-18 health
situation during the past week.

The NOAA-18 AMSU-A2 instrument continues to show unusual reading in its
Digital-A telemetry. See Figures 2-4. The instrument\'s vendor
recommended adjusting the Cold Calibration look position from position 1
to position 2. This was to return the instrument to its settings prior
to the Cold Calibration reset event on 31 Sept 2007. The commanding to
adjust the Cold Calibration to position 2 was completed on 21 Feb 2008
at 14:00 UTC. .

MetOp-A: There were relatively no changes to the MetOp-A NOAA
instruments health situation during the past week.

Following the post-PLSOL decrease in SNR for AVHRR Channels 2 and 3A,
this week's data showed a slight recovery towards the pre-PLSOL values
(see Figure 6).  The post-PLSOL values are still slightly below the
pre-PLSOL

![](media/image4.jpeg){width="8.891666666666667in"
height="6.497222222222222in"}

Figure 2 NOAA-18 AMSU A2 (2008/038-039)

![](media/image5.jpeg){width="8.891666666666667in" height="6.625in"}

Figure 3 NOAA-18 AMSU A2 (2008/052-053)

![](media/image6.jpeg){width="8.891666666666667in" height="6.625in"}

Figure 4 NOAA-18 AMSU A2 (2008/038-039)

![](media/image7.jpeg){width="8.891666666666667in" height="6.625in"}

Figure 5 NOAA-18 AMSU A2 (2008/052-053)

![](media/image8.jpeg){width="9.427083333333334in" height="5.6875in"}

Figure 6 MetOp-A AVHRR (2007/168-2008/051)