Wide angle Earth sensor

Martin R. Rost

doi:10.1117/12.283818

18 September 1997 Wide angle Earth sensor

Martin R. Rost

Proceedings Volume 3117, Earth Observing Systems II; (1997) https://doi.org/10.1117/12.283818
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A 120 X 5 degree instantaneous field-of-view Wide Angle Earth Sensor has been developed for use on missions that are prohibited from viewing the Earth with the payload sensor. Developed especially for NASA's WIRE (Wide-Field Infrared Explorer) mission, the WAES consists of two Sensor Heads and an Electronics Control Unit. On the WIRE mission the sensor heads are arranged back to back 180 degrees apart such that they can monitor one axis of rotation, while a sun sensor is used for the other axis. This is of extreme importance to these missions, as the telescope features a detector that is cooled by a solid hydrogen cryogen. Accidental viewing of the Earth or sun would cause the cryogen to boil off and end the mission prematurely. The predicted accuracy of 1.5 degrees exclusive of radiance errors and 3.5 degrees inclusive of radiance errors.

Citation Download Citation

Martin R. Rost "Wide angle Earth sensor", Proc. SPIE 3117, Earth Observing Systems II, (18 September 1997); https://doi.org/10.1117/12.283818

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