GOES-L UPDATE
last updated 12 June 2006
GOES-L UPDATE
last updated 12 June 2006
GOES-11 was kept in cold on-orbit storage at 104 W during 2000-2006. It was revived at least once per year for orbit adjustment. GOES-11 will have had 2 years of on-ground storage and 6 years of on-orbit storage before becoming operational. This on-orbit storage is not "free", since the same amont of fuel must be used to maintain orbit inclination over the equator. In addition, radiation damage and other simple aging effects are unavoidable.
Post-launch testing was more uneventful than any of the previous satellites in the series. After launch and geo-stationing in 2000, there was at least 10 years worth of station-keeping fuel on board. During on-orbit storage, there were no significant concerns with the instruments or spacecraft.
On 16 May 2006, GOES-11 failed to power on its sensor data transmitter side A, a communications box which formats and transmits the raw instrument data to the ground. Two fuses for side A were tripped. On 19 May, the redundant sensor data transmitter side B was successfuly turned on.
In May-June 2006, GOES-11 is being revived to replace GOES-10 as GOES-WEST at 135W. The target date for replacing GOES-10 is 28 June 2006.
Topic: GOES-10 to GOES-11 Transition Plan - Update #5 Message Issued: June 12, 2006, 0140 UTC Satellites Impacted: GOES-10 and GOES-11 Products Impacted: GOES-10 and GOES-11 Imager and Sounder Data and Associated Products including AWIPS Date/Time of Initial Impact: GVAR Switch from GOES-10 to GOES-11 on June 21, 2006, GOES-11 Direct Operations on June 28, 2006. ----------------------------------------- Details: ***GOES-11 is scheduled to replace GOES-10 as the GOES-West operational spacecraft on June 21, 2006*** (GVAR switch from GOES-10 to GOES-11 on June 21. GOES-11 GVAR to be flowed through GOES-10 until June 28) This message is to provide additional information on a planned transition from GOES-10 to GOES-11 as the operational GOES-West spacecraft. Characteristics of the Imager and Sounder are similar from GOES-10 to GOES-11 (except GOES-10 is currently operating in a Yaw Flip mode). Additional information can be found at: http://www.osd.noaa.gov/Gvar/gvardownload.htm ). Ground equipment may require adjustments to satellite id. Position locations of GOES-11 are contained at the end of this message. The plans developed are intended to cause as few disruptions to all users who need to acquire the GOES-11 GVAR signal via a ground antenna. An up to date synopsis: (1) GOES-11 was taken out of Z-axis storage and is currently being moved to the 135 degrees West position. (2) GOES-11 GVAR startup (for testing and calibration purposes) on May 25, 2006 with short Full Disk imaging (19 minute scans) at XX:00 and XX:30, with CONUS soundings at XX:01. (3) As GOES-11 arrives close to 135 degrees West (on June 21, 2006), GOES-11 data will be flowed through GOES-10 communication links, thus, GOES-11 data is operational but received through GOES-10 downlink. Users point to GOES-10 to receive GOES-11 data. At this point GOES-11 data are considered operational, but should significant problems occur, GOES-10 data can be reestablished quickly. The GOES-West schedule at: http://www.ssd.noaa.gov/PS/SATS/GOES/WEST/sched.html will begin on GOES-11 on June 19, 2006. Details of this event: - June 19 at 21:45 UTC - GOES-11 begins West imaging schedule. - June 21 at 19:00 UTC - GOES-11 starts to flow data through GOES-10 (GVAR switch). GOES-10 begins executing a Housekeeping only schedule. (4) As GOES-11 is within 1 degree of GOES-10 (on June 28, 2006), will turn off GOES-10 signal, and acquire GOES-11 data directly from GOES-11, not GOES-10. Users should not need to repoint their antenna, as the two satellites are very close. (GOES-11 stop maneuver scheduled for June 28 at 03:07 UTC) (5) Switch ancillary communication services (DCS, LRIT, EMWIN, SAR) from GOES-10 to GOES-11, on or about June 28, 2006. (6) Pending the successful PLT and checkout of GOES-N (launched May 24, 2006), and successful arrival of GOES-11 at 135 degrees West, GOES-10 will be moved to 60 degrees West at a rate of 0.6 degrees per day for South American support in October 2006. (GOES-10 drift start maneuver scheduled for June 30 at 00:00 UTC) These intricate steps are necessary to provide a continuous flow of data, with minimal impact to users. There should be no need to readjust antenna unless there is a desire to acquire GOES-11 data prior to GOES-11 becoming operational. Position Locations for GOES-11: Date Time(UTC) Lat Lon 60612 0 0.36N 120.09W 60612 120000 0.36S 120.28W 60613 0 0.36N 121.05W 60613 120000 0.36S 121.24W 60614 0 0.36N 122.00W 60614 120000 0.37S 122.20W 60615 0 0.37N 122.96W 60615 120000 0.37S 123.16W 60616 0 0.37N 123.92W 60616 120000 0.37S 124.12W 60617 0 0.37N 124.88W 60617 120000 0.37S 125.08W 60618 0 0.37N 125.84W 60618 120000 0.37S 126.03W 60619 0 0.37N 126.80W 60619 120000 0.37S 126.99W 60620 0 0.37N 127.76W 60620 120000 0.37S 127.95W 60621 0 0.37N 128.72W 60621 120000 0.38S 128.90W 60622 0 0.38N 129.67W 60622 120000 0.38S 129.85W 60623 0 0.38N 130.62W -------------------------------------- Contact Information: Brian Hughes Satellite Services Division NOAA/NESDIS/OSDPD 301-763-8051 x106 brian.hughes@noaa.gov See http://www.ssd.noaa.gov/PS/SATS/messages.html for this and other satellite related messages. See http://www.ssd.noaa.gov for full GOES scanning schedules.
GOES-11 Status On August 15, 2000, at approximately 06:16 Z, the GOES-11 spacecraft was successfully placed in the Z-Axis Precession (ZAP) storage mode. Flight data shows that the actual major axis and desired spin-up rates were extremely close to those predicted. The initial maximum nutation cone was approximately 2.5 degrees, indicating a good spin maneuver and an accurate mass property prediction from the spacecraft manufacturer, SS/L. The target angular velocity magnitude was 0.7 deg/sec and 0.698 deg/sec was achieved. Further analysis will reveal long term attitude and thermal stabilization performance, but it is expected to be excellent. Ranging results show that GOES-11 is now located at 104.2 deg W longitude with a West drift rate of 0.01 deg/day. The GOES-11 orbit will turn around at 106.7 deg W longitude in July 2001. The event marks the 7th ZAP storage maneuver for the GOES constellation and a further validation of the robustness of the storage mode design.
Launch May 3
Circularize Orbit May 3--May 21
AMF 1 May 5
AMF 2 May 7
AMF 3 May 9
AAM May 11
Trim 1 May 18
Trim 2 May 19
Trim 3 May 21
Deployments
Mag boom and final SA deployment May 12
Dipole Estimation May 13
Momentum Wheel turn-on and Solar Sail Deployment May 14-15
Cooler Cover deployment June 10
GOES-L becomes GOES-11 May 11
Imager/Sounder Initialization May 14
First Official Image May 17 at 1900 UTC
Sounder and Imager Outgassing May 12--June 9
Instrument Contamination Avoidance May 14-20
Start-ups and functional tests May 12--June 9
X-Ray Sensor (XRS) Turn on May 16
Safehold Mode Characterization May 21
Communications Testing May 22--June 7
Solar Array Drive stepping tests May 25-27
Earth Sensor Characterization May 28--June 9
System Performance and Operational Testing (SPOT) June 10--July 23
Station Maneuvers June12-14
North/South Stationkeeping Maneuver June 12
East/West Stationkeeping Maneuver June 14
NOAA Science Testing July 24--August 13
Enter Z-Axis Precession (ZAP) storage mode August 14-15
Spacecraft Hand-over to NOAA August 16
As of 21 May 2000: Sensors AOCE 1 on DIRA 1 (gyros) on Coarse Analog Sun Sensor (CASS) 1 on Digital Sun Sensor (DSS) 1 on Earth Sensor (ES) 1 on Magnetometer 1 on EPS/HEPAD on X-Ray Sensor on Deployments Magnetometer boom-released-locked Solar Array fully deployed Solar Array Drive Electronics side 1 on Solar Array Run Mode Trim Tab at 10 degrees Solar Sail fully deployed Control mode and Actuators Normal on-orbit L1Mode (earth pointing) Momentum Wheels 1 and 2 @2900 RPM and Reaction Wheel off Main Spacecraft Thruster Isolated Telemetry Transmitters CDA A transmitter on DSN A transmitter on DSN B transmitter off Command Units 1 and 2 in secure mode Communications Power AMPs A and C on (for thermal heating) Sensor data transmitter on Thermal Imager/Sounder Outgas heaters on High Payload Imager & Sounder on and scan functional
2) Sounder Filter Wheel Back-EMF anomaly occurred May 18.
Sounder FW current and un-powered winding voltage showed YH TLM violation.
Sounder FW current and voltage problems were corrected by cycling the Sounder electronics ON.
Both current and voltage went back to the nominal values.
3) AOCS FMT change anomaly occurred May 18.
When commanded to switch to FMT 126, FMT 126 was not received.
The problem was isolated to the Santiago ground network station and their operation method for energizing the 16 kHz sub-carrier just before a command up-link and dropping it immediately after the command is sent.
4) Attitude Deviation on June 16.
An attitude fluctuation of 0.01 degree was observed in yaw (east-west).
The cause is not yet understood.
The expected launch date was 15 March 1999, but then it was moved up to 15 May 1999 to accomodate another launch.
The expected launch date was then moved to 23 May 1999, due to concern about the second stage rocket.
The GOES-L May launch was then put on hold throughout the summer of 1999 due to a spate of rocket failures in similar second stage rockets.
The rockets were cleared for use in August of 1999, and GOES-L was re-scheduled for mid-November 1999 and then mid-December 1999.
The late 1999 launches which were both pre-empted by other launches.
In January 2000, GOES-L was given a firm launch data of 3 May 2000.
However, a Shuttle launch during the last week of April 2000 was delayed by weather. It could have pre-empted the GOES-L launch in the first week of May. Fortunately, GOES-L was given the green light on April 29th.
Finally, GOES-L did launch sucessfully on 3 May 2000, at 3:07 am EDT, just 40 minutes after the planned launch time of 2:27 am.
After about 3 months of post-launch checkout at 104W, NOAA put GOES-11 into on-orbit cold storage in mid-August 2000.
We hoped that NOAA would use GOES-L to perform continuous rapid scans of the south Atlantic and Caribbean during the Y2K hurricane season, before being turned off.