The Laser Retro-Reflector (LRR) is mounted on the Earth-facing panel of Envisat close to the RA-2 antenna to support satellite ranging for precise orbit determination and RA-2 range measurement calibration. Laser tracking provides the distance between the spacecraft and the station and is assimilated in precise orbit determination. It will be used extensively during the commissioning phase and regularly during the mission to verify the stability of the positioning system.
Passive optical instrument
Efficiency: less or equal than 0.15 end-of-life, Reflection Coefficient: less or equal than 0.80 end-of-life, Field of view: elev. half-cone angle 60 degrees; azimuth 360degrees, Diameter: more or equal than 20 cm
350-800 nm optimised for 532 nm
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