# Presentation: 547344

## Landsat Project StatusLandsat Science Team Meeting

**July 15, 2008**
**Presented By:**
**Kristi Kline, PMP**
**Landsat Project Manager, U.S. Geological Survey/EROS**
_**kkline@usgs.gov**_**, (605) 594-2585**

## Mission Status

## Landsat 5 Status

**On-board Computer (OBC) Fix**
- Fixes an erroneous halt command that could cause safe hold situation
- Halt of the OBC would likely result end of mission
- Same changes made on other mission with similar bus (EUVE, CGRO, and UARS NSSC-1)
- No date yet on installation – working on implementation plan
**Attitude testing**
- Goal:  Improve pointing accuracy by calibrating the gyros
- Due to Solar Array issue, L5 must pitch (not during imaging) to increase charging
- Attitude issues have been seen in the past
- 4 tests conducted (June 12-18) – 2 roll and 2 yaw tests
- Star Catalog testing commences in July (2-3 weeks) to support improved attitude
- Test 3-day updates versus the nominal 8-day updates

## Landsat 5 Status (Cont.)

**Ranging support for Lunar Reconnaissance Orbiter (LRO)**
- Assisting with certification of stations prior to launch of LRO
- Hawaii certified; Australia in work; Germany and Sweden pending
**MPS (Modular Power Subsystem)**
- Battery 1 Failed in 2005
- Battery 2 lost cell in October 2007
- Resumed science operations in March 2008 with Battery 2 as primary and battery 3 secondary
- Testing and analysis determined additional power and margin could be gained through a Battery 3-primary configuration
**Traveling Wave Tube Amplifier (TWTA) – X-band downlink**
- Unusual start-up profile began in June (see charts)
- Working with Aerospace expert to analyze
- May be result of a change in state of electronics associated with the TWTA
- Operational currents have trended down since the start of this unusual profile
- Advises to monitor the current for any further changes; change appears to be benign

## Landsat 5 TWTA Current Profile

## Landsat 7 Status

**Planned bMOC Exercises – Two passes on June 24**
**Attitude Control System**
- Inertial Measurement Unit (IMU) Gyros
- Gyro 3 (of 3) shut down due to vibrations in 2005
- Shut down, not failed.  Possibility of recovery if needed.
- Gyros 1 and 2 operating nominally with no trend to failure
- Currents and biases not entirely stable, but no trend visible
- Began work on a single-gyro flight capability in 2005
- Have current capability to maintain pseudo-stable flight with maneuver capability with 1 gyro.
- Working with Lockheed-Martin and Honeywell on rate estimator that will provide up to an order of magnitude better performance with greater consistency
- Approach validated on simulator
- Algorithm being refined to fit within in processor capability
- Expect more updates/testing in July on the simulator to streamline code

## Landsat 7 Solid State Recorder Recovery

**Background**
- 5 of 24 Printed Wire Assembly (PWA) boards shut down
- Cause identified as pseudo-random event – likely power fluctuation resulting in autonomous shut down
- Analysis concludes no “hard” failure likely on any of the boards
- FOT has NOT reset the autonomous current protection circuit or recycled the backplane power
- No additional impact to LTAP from latest board shutdown, but overall impact due to reduced on-board storage (21% capacity loss)
- Full Capacity (all 24 boards): 100 scenes (378 Gbits)
- Additional downlink needed to empty recorder
- Terra has SSR from same manufacturer (L3Comm)
- Experienced same issue and successfully recycled backplane power and turned on PWA (unplanned activity)

## Landsat 7 Solid State Recorder Recovery

**Recovery Plan**
- Step 1:  Re-power PWA #23 (1st PWA Lost) – **Tentative July**
- Backplane power was recycled 1 time since shut down
- Analysis of results prior to Step 2
- Step 2:  Re-power PWA #12, 2, 13, 22
- Analysis of results prior to Step3
- Step 3:  Recycle backplane power (Optional)
- Would only be necessary if step 2 is unsuccessful
- Not recommended at this time.
**Risks**
- Repowering individual PWA will not cause increased risk
- PWA will shut down autonomously again if “hard failure” (E.g., circuit short) is problem
- Backplane power recycling – small chance failure of entire backplane (WILL ONLY DO THIS IF NECESSARY – should additional failures lead to unacceptable loss of ops capability)

## NASA Risk Assessment

**Risk assessment in 2005 concluded that the probability for Landsat 7 failure prior to 2010 is 99% primarily due to gyroscope issues (with launch requirement of 2 gyros)**
**NASA and USGS intend to update the report this year**

## Ground Segment Activities

## Ground Segment Activities

**Archive**
- Off-site archive
- Continued work on off-site archive tape copies
-  3404/3683 (92.42%) completed
- Six box tape shipment (432 tapes) to NARA managed limestone cave near Kansas City; total tapes shipped now 46 boxes (3312 tapes)

## Landsat Data Acquired by Month

## Global Land Survey

_**MDA Federal Task Order**_
**GLS2000 processing **
- Completed initial deliveries of all areas of the globe
- 9 areas have been identified as not meeting 30m spec.
- Rework in progress (6-700 scenes to be replaced)
- Africa & India scenes resent and being analyzed
- Expecting NZ and South America early next week
**GLS1975, GLS1990**
- Metadata issues in work
- Should have delivery by end of 4th quarter

**GLS2005**
- L7 processing
- North America, Africa, Eurasia, S. America complete
- Waiting on scene lists for Rest of World
- L5 processing
- Start planned for late July

## GLS2005 Status

## Web-Enabling Activities

**Created Ground Control  Points (GCPs) from GLS2000 data received**
**Web-enabled Landsat Archive (current L7 newly acquired) for all areas with GCPs**
- Global data currently processed and distributed
**Landsat System Upgrades**
- Submitted procurements for SAN and processing system upgrades for Web-Enabling
- Throughput tests
- Can currently process approximately 600 scenes per day
- Working toward throughput of 1500-2000 per day
- Tests helping to identify system bottlenecks

## Web-Enabling Activities

**Landsat System Upgrades (Cont.)**
- Upcoming Web-enabling Activities
- System Releases (LPGS, LAM, UIS, NLAPS)
- Installation of new hardware
- Cache mgmt & cross-cut system changes
- L4 TM processing in LPGS – **DELAYED**
- Stand down all recipes, options, priorities, etc - **DELAYED**

## Web-enabled Schedule

## Web-enabled Scenes Available

## Web-enabled Customer Demographics(*Does NOT Include Bulk FTP Downloads)

## Total Landsat Data Distribution

**Over 41,000 Standard L1T products downloaded since June 2007**

## Landsat Sales by Month

## GENERAL BACKUP SLIDES

## Project Management Structure

## Landsat 5 Flight Segment

**HIGH GAIN ANTENNA**
-  8/85 Transmitter A  failure

**MULTI-SPECTRAL SCANNER**
-  8/95 Band 4 failure

**SOLAR ARRAY DRIVE / PANELS**
-  01/05 Primary Solar Array Drive failure
-  Nominal Solar array panel degradation (12/04)
-  11/05 Redundant Solar Array Drive Malfunction

**COARSE SUN SENSORS**

**GPS ANTENNA**
-  Not Operational

**OMNI ANTENNAS**

**ACS MODULE**
-  07/03 FHST#1 Degradation
-  Skew wheel tack anomaly 10/92
-  11/92 Earth Sensor 1 failure
-  02/02 Earth Sensor 2 failure
-  Intermittent operations possible

**PROPULSION MODULE**
-  3/84 Primary Thruster D failure

**POWER MODULE**
- 05/04 Battery 1 failure /   Removed from power circuits
- 10/07 1 of 22 Cells fails on Battery #2

**THEMATIC MAPPER**
-  10/94 Power Supply 1 stuck switch
-  06/02 TM switched to bumper mode

**WIDEBAND COMM. MODULE**
-  07/88 Ku-band TWTA Prime failure (OCP)
-  07/92 Ku-band TWTA Redundant failure (OCP)
-  08/87 X-band TWTA Prime failure (OCP)
-  03/06 X-band TWTA Redundant Anomaly

**X-BAND ANTENNA**

**DIRECT ACCESS S-BAND**
-  03/94 Side A FWD Power Sensor failure

**COMM & DATA HANDLING MODULE**
- Located back side of s/c

## Spacecraft Status

**Attitude Control System**

**X-band System**

**S-band System **

**Performance nominal**

**Enhanced Thematic Mapper +**

**Electrical Power System**

_**Batteries:**_

** ****Performance nominal **

**Solid State Recorder**

**Reaction Control System**

**1/07/04 Fuel line #4 thermostat #1a failure.**
**2/24/05 Fuel line #4 thermostat #1b failure**
**Thermostat 2a shows signs of failure**
**No impact to ops; extended plan in place**

_**Solar array:**_

**5/14/2002 Circuit #14 Failure**
**5/16/2005 Circuit # 1 Failure**
**14 circuits remain operating**
**no impact to ops**

**11/15/1999 SSR PWA #23 Loss**
**02/11/2001 SSR PWA #12 Loss**
**12/07/2005 SSR PWA #02 Loss**
**08/02/2006 SSR PWA #13 Loss**
**03/29/2008 SSR PWA #22 Loss**
**Each PWA is 4% loss of launch capacity**
**Boards are likely recoverable**

**Performance nominal**

**•****05/05/2004 Gyro 3 Shut Off**** **
**•****Singe gyro control system **
**     ****in development**

**•****5/31/2003 SLC Failure **

**•****4/01/2007 SAM -> Bumper mode**

## Landsat Ground System Architecture

## Landsat 5 Ground Station Network

## Landsat 7 Ground Station Network

## Combined Ground Station Network

## Historical Stations

## Ground Station Identifiers

| Country | Location | Identifier | Satellite Rcvd |
| --- | --- | --- | --- |
| Argentina | Córdoba | COA | L5, L7 |
| Australia | Alice Springs | ASA, ASN | L5, L7 |
| Australia | Hobart | HOA | L5, L7 |
| Brazil | Cuíaba | CUB | L5 |
| Canada | Gatineau | GNC | L5 |
| Canada | Prince Albert | PAC | L5 |
| China | Beijing | BJC | L5 |
| China | KaShi | KHC | L5 |
| Italy (ESA) | Matera | MTI | L5 |
| Indonesia | Parepare | DKI | L7 |
| Japan | Hatoyama | HAJ | L5 |
| Japan | Hiroshima | HIJ | L7 |
| Kenya (ESA) | Malindi | MLK | L5* |
| Mexico | Chetumal | CHM | L5* |

- * Campaign Station

## Ground Station Identifiers

| Country | Location | Identifier | Satellite Rcvd |
| --- | --- | --- | --- |
| Norway | Svalbard | SGS | L5, L7 |
| Russia | Irkutsk | IKR | L5* |
| Russia | Magadan | MGR | L5* |
| Russia | Moscos | MOR | L5* |
| South Africa | Hartebeesthoek | JSA | L5 |
| Spain (ESA) | Maspalomas | MPS | L5* |
| Sweden (ESA) | Kiruna | KIS | L5 |
| Thailand | Bangkok | BKT | L5 |
| U.S.  | Gilmore Creek, AK | GLC | L5* |
| U.S.  | Poker Flats, AK | AGS | L5, L7 |
| U.S. | Poker Flats, AK | PFS (PF1, PF2) | L5, L7 |
| U.S. | Sioux Falls, SD | LGS | L5, L7 |
| U.S. | Univ. of Puerto Rico | UPR | L7 |

- * Campaign Station

## U.S. Landsat Archive Overview(Marketable Scenes through May 31, 2008)

**ETM+: Landsat 7**
- 830,440 scenes
- 771 TB RCC and L0Ra Data
- Archive grows by 260 GB Daily
**TM: Landsat 4 & Landsat 5**
- 745,235 scenes
- 373 TB of RCC and L0Ra Data
- Archive Grows by 40 GB Daily
**MSS: Landsat 1 through 5**
- 652,174 scenes
- 20 TB of Data

## Define the content of the archives

| Satellite | Sensor | Date Range | Data
Format | Scenes | Volume | Media |
| --- | --- | --- | --- | --- | --- | --- |
| L1 - 3 | MSS | Jul 23, 1972 – Sep 7, 1983 | MSS-X, WBV | 199,319 | 6.01 TB | DLT 7000 |
| L2 - 3 | MSS | Jan 22, 1975 – Sep 7, 1983 | MSS-P, RCC | 61,601 | 1.82 TB | 9940B |
| L2 - 5 | MSS | Jan 22, 1975 – Oct 15, 1992 | MSS-A, RCC | 261,046 | 7.88 TB | 9940B |
| L4 | TM | Aug 17, 1982 – Nov 18, 1993 | TM-A, TM-R, RCC | 58,457 | 29 TB | 9940B |
| L5 | TM | Mar 1, 1984 – Current | TM-A, TM-R, RCC | 668,296 | 335 TB | 9940B |
| L7 | ETM+ | Apr 15, 1999 – Current | L0Ra, RCC | 755,401 | 701 TB | 9940B |
|  |  |  |  | 2,004,120 | 1,081 TB |  |

**USGS Archive Content (Sept 2007)**