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Ocean Surface Topography from Space
MISSIONS
Spacecraft and Instruments
Artists concept of the OSTM/Jason-2 spacecraft.
Artists concept of the OSTM/Jason-2 spacecraft.

OSTM/Jason-2 Instruments

Artists concept of the Poseidon-3 dual frequency altimeter.
Poseidon-3 dual frequency altimeter
The Poseidon-3 radar altimeter is the main instrument on the Jason-2 mission. Derived from the Poseidon-1 altimeter on TOPEX/Poseidon and the Poseidon-2 on Jason-1, it measures sea level, wave heights and wind speed.

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Artists concept of the Advanced Microwave Radiometer (AMR).
Advanced Microwave Radiometer (AMR)
The Advanced Microwave Radiometer (AMR), is an enhanced version of the Jason-1 Microwave Radiometer (JMR). Like the JMR, it acquires measurements via three separate frequency channels to determine the path delay of the altimeter's radar caused by atmospheric water vapor.

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Artists concept of the Doppler Orbitography and Radio-positioning Integrated by Satellite (DORIS).
DORIS
The DORIS instrument onboard Jason-2 will provide real-time location and precise orbit determination. DORIS measurements are also used for geophysical studies.

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Artists concept of the Global Positioning System Payload (GPSP).
Global Positioning System Payload (GPSP)
The GPSP is a tracking system that receives dual-frequency navigation signals continuously and simultaneously from 16 GPS satellites to determine the exact position of a transmitter.

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Artists concept of the Laser Retroreflector Array (LRA).
Laser Retroreflector Array (LRA)
The LRA is an array of mirrors that provide a target for laser tracking measurements from the ground. By analyzing the round-trip time of the laser beam, we can locate where the satellite is on its orbit.

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