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Explore the many instruments the European Space Agency use to observe the Earth. ESA offer data from a wide range of optical, radar, atmospheric, altimetric and gravimetric instrumentation.
Instrument - Laser Ranging
The LRR instrument aboard Envisat was used to accurately determine the orbital height of the satellite.
Instrument - Positioning/Navigation
The Precise Range And Range-Rate Equipment (PRARE) was a microwave tracking system on board the ERS-1 and ERS-2 missions.