SRTM MISSION STATISTICS
Shuttle Radar Topography Mission
Statistics
Update 3/14/00
Mission Statistics:
Launch: February 11, 2000, 12:44 pm EST
Landing: February 22, 2000, 6:22 pm EST at Kennedy Space Center
Mission Duration: 11 days, 5 hours, 38 minutes
Project Start: August 1996
Project End: March 2001
Project Life Cycle: 60 months (42 months start to launch; 18 months data processing) |
| Data Statistics |
| Land coverage: |
Targetted land was 80% of Earth landmass (119.56 M km2, 46.16 M mi2)
99.968% targetted land mapped at least once (119.51 M km2, 46.14 M mi2)
94.59% targetted land mapped at least twice (113.10 M km2, 43.66 M mi2)
49.25% targetted land mapped at least 3 times (58.59 M km2, 22.73 M mi2)
24.10% targetted land mapped at least 4 times (28.81 M km2, 11.12 M mi2)
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Land area missed: 50,000 km2 (all in US)
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| Data Takes: |
765 total
399 C-band only
1 X-band only
365 C and X-band simultaneous
674 data takes over land
61 Built In Test Equipment (BITE) data takes
28 'short' ocean calibration data takes
2 'long' ocean calibration data takes |
| Data Tapes: |
330 total high-density tapes used
208 tapes with C-band data, plus one double-recorded (pilot) tape
122 tapes with X-band data, plus one double-recorded (pilot) tape
(C-band tapes each recorded ~ 30 min. of data at 180 Mbits/sec,
X-band tapes recorded 60 min. of data at 90 Mbits/sec, and were on
average 73% utilized) |
| Data Acquisition: |
222.4 hours total duration of mapping phase
99.2 hours C-band operation
90.6 hours X-band operation
8.6 Terabytes C-band data (=14,317 CDs)
3.7 Terabytes X-band data (=6101 CDs)
12.3 Terabytes total data (=20,418 CDs)
(Approx. equal to Library of Congress) |
Data Played Back 104 C-band playbacks
During Flight 49 X-band playbacks
Energy used: 902.8 kWh (911 kWh planned)
Payload Weight: approximately 13,600 kg
(approximately 29,000 lbs or 14.5 tons)
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| Mission Costs: |
$133M Mission Development Costs without Launch Delay
$8.2M Launch Delay Costs
$142M Total Mission Cost
$50M Launch Costs
$40M X-SAR Costs |
Mission Objective:
To use C-band and X-band interferometric synthetic aperture radars (IFSARs)
to acquire topographic data over 80% of Earth's land mass (between 60degN and
56degS) during an 11-day Shuttle mission. Produce digital topographic map
products which meet Interferometric Terrain Height Data (ITHD)-2 specifications
(30 m x 30 m spatial sampling with <=16 m absolute vertical height accuracy,
<= 10 m relative vertical height accuracy and <=20 m absolute horizontal
circular accuracy). All accuracies are quoted at the 90% level, consistent with
National Map Accuracy Standards.
Mission Firsts:
- Fixed baseline single-pass spaceborne interferometric SAR
- Dual frequency (C-band and X-band) interferometric SAR
- Largest rigid structure flown in space
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| Mast Information: |
| Mast Length |
60 m |
200 feet |
| Nominal Mast Diameter |
1.12 m |
44.12 in |
| Nominal Bay Width at Longerons |
79.25 cm |
31.20 in |
| Nominal Bay Length |
69.75 cm |
27.46 in |
| Number of Bays |
87 |
|
| Canister Diameter (at largest ring) |
1.36 m |
53.5 in |
| Stack Height/Bay |
1.59 cm |
0.63 in |
| Canister Length |
2.92 m |
115 in |
| Mast Mass |
290 kg |
640 lb |
| Canister Mass |
695 kg |
1530 lb |
| Mast Material: |
longeron material is carbon fiber reinforced plastic (CFRP);
Diagonal materials include stainless steel and alpha titanium.
Ball joints are made from hardened stainless steel. |
| Mast Construction: |
AEC-Able Engineering Company, Inc. (ABLE), Goleta, California
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Mission Sponsors:
- National Geospatial-Intelligence Agency (NGA)
- National Aeronautics and Space Administration (NASA)
- German Aerospace Center (DLR, Deutsches Zentrum fur Luft- und Raumfart)
- Italian Space Agency (ASI, Agenzia Spaziale Italiana)
Project Management:
- Jet Propulsion Laboratory
Data Product Applications:
- Scientific applications:
- Geology, geophysics, earthquake research, volcan
- monitoring
- Hydrologic modeling
- Co-registration of remotely acquired image data
- Civilian applications:
- Enhanced Ground Proximity Warning Systems for aircraft
- Civil engineering, land use planning
- Line of sight determination for communications (e.g. cell phones)
- Military applications:
- Flight simulators
- Logistical planning, trafficability
- Missile and weapons guidance systems
- Battlefield management, tactics
Implementation
- Modifying and adding to SIR-C/X-SAR instruments flown successfully as
Space Radar Laboratory Missions (SRL-1, April 1994; SRL-2 October 1994)
- Partnership: Major new components provided by industry.
Mission Manifest:
- STS-99 Shuttle Endeavour
- SRTM was a single payload mission
- Shuttle travelled tail forward at 7.5 km/sec (17,000 mph)
- Attitude was rolled 59 deg from the bay-down orientation, placing the mast at 45 deg
from vertical
- Nominal altitude: 233 km (approximately126 nautical miles, 145 statute miles) with
orbital adjustment once per day
- 150 data acquisition orbits plus activation, on-orbit checkout and de-activation
- 6-member crew to activate payload, deploy and stow mast, align inboard and outboard
antennas, monitor payload flight systems, operate on-board computers & recorders, &
handle contingencies
STS-99 Crew
Commander: Kevin Kregel
Pilot: Dom Gorie
Mission Specialists: Janet Kavandi, Janice Voss,
Mamoru Mohri (NASDA), Gerhard Thiele (ESA)
Significant Contractors:
- AEC-ABLE Engineering, Goleta, CA (deployable mast & canister)
- America Technology Consortium, Camarillo, CA, (motors and actuators)
- Ball Telecommunication Products Division, Boulder, CO(outboard antenna)
- Daimler-Benz Aerospace (Dornier Satellite Systems), Friedrischafen, Germany (X-band radar system)
- Composite Optics Inc., San Diego, CA (composite outboard structure)
- ENERTEC, France (onboard high rate recorders)
- Lockheed Martin, Palo Alto, CA (star tracker)
- Mission Space, La Canada, CA (command & telemetry systems)
- JDS Uniphase Corporation, Chalfont, PA (calibration optical link)
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