. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.9 m 5.5 m Objectives • Three-year global view of Earth’s oceans TOPEX/POSEIDON • Improved understanding of ocean currents Ocean Surface Topography Experiment • Improved forecasting of global climate Global Positioning Highlights System Antenna Solar Array High-Gain Antenna • Joint U.S.–France (Centre National (1.2 m dia.) d’Études Spatiales — CNES) program 3.3 m Satellite Bus • Launched August 10, 1992, on Ariane 42P launch vehicle Attitude Control Module • Completes nine years of mission operations Propulsion Module on August 10, 2001 • Sensors: – Altimeters (NASA, CNES) – Microwave radiometer (NASA) Power Module – Global Positioning System Microwave Radiometer receiver (NASA) Instrument Module – Laser retroreflector array (NASA) Doppler Laser Retroreflector Tracking Antenna (DORIS) Array – Doppler tracking antenna (CNES) Altimeter Antenna • Orbits Earth at 1336-km altitude, 66-degree Wet mass: 2370 kg inclination Dry mass: 2160 kg • 10-day repeat of ground tracks (± 1-km accuracy) TOPEX/POSEIDON • Covers 95% of the ice-free oceans every 1992 1993 1994 1995 1996 1997 1998 2000 2001 Measurement System 10 days Launch GPS • Unprecedented accuracy: sea-level 8/10/92 Satellite measurements to better than 5 cm Engineering Assessment Satellite Orbit • Has measured sea levels, mapped basin- Completed 9/24/92 Radar Altimeter Signal wide current variations, monitored effects Verification Phase of currents on global climate change; Completed 2/22/93 Gravity’s Influence studied phenomena such as El Niño and on Sea Level Pacific Decadal Oscillation (PDO) Prime Mission DORIS Ocean Surface Laser Ranging 3 Years Beacon Topography Extended Observational Phase 6 Years Station JPL 400-605, Rev. 1 5/01 WWW Site: http://sealevel.jpl.nasa.gov
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8.9 m
5.5 m
Objectives
• Three-year global view of Earth’s oceans TOPEX/POSEIDON • Improved understanding of ocean currents
Ocean Surface Topography Experiment • Improved forecasting of global climate
Global Positioning HighlightsSystem Antenna
Solar Array
High-Gain Antenna • Joint U.S.–France (Centre National (1.2 m dia.) d’Études Spatiales — CNES) program
3.3 m Satellite Bus • Launched August 10, 1992, on Ariane 42P
launch vehicleAttitude Control Module • Completes nine years of mission operations
Propulsion Module
on August 10, 2001 • Sensors:
– Altimeters (NASA, CNES) – Microwave radiometer (NASA) Power
Module – Global Positioning System Microwave Radiometer receiver (NASA)
Instrument Module – Laser retroreflector array (NASA)
Doppler Laser Retroreflector Tracking Antenna (DORIS)
Array – Doppler tracking antenna (CNES)
Altimeter Antenna • Orbits Earth at 1336-km altitude, 66-degree Wet mass: 2370 kg inclination Dry mass: 2160 kg
• 10-day repeat of ground tracks (±1-km accuracy)
TOPEX/POSEIDON • Covers 95% of the ice-free oceans every1992 1993 1994 1995 1996 1997 1998 2000 2001 Measurement System 10 days Launch GPS • Unprecedented accuracy: sea-level8/10/92 Satellite
measurements to better than 5 cm Engineering Assessment Satellite Orbit • Has measured sea levels, mapped basin-Completed 9/24/92
Radar Altimeter Signal wide current variations, monitored effects Verification Phase of currents on global climate change;Completed 2/22/93 Gravity’s Influence studied phenomena such as El Niño and
on Sea Level Pacific Decadal Oscillation (PDO)Prime Mission DORIS
Ocean SurfaceLaser Ranging3 Years Beacon Topography
Extended Observational Phase6 Years
Station
JPL 400-605, Rev. 1 5/01
WWW Site: http://sealevel.jpl.nasa.gov
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