Use of a geosynchronous satellite within the SARSAT/COSPAS systemOperational characteristics of combined LEO SARSAT/COSPAS and GEO spacecraft for localization of aircraft and seacraft emitting distress signals are described. Although 121.5 MHz capability is now included in all SARSAT/COSPAS satellites, limitations on the number of simultaneous signals which can be processed at that frequency due to atmospheric noise indicates the employment of the 406 MHz band. Additionally, the necessity for on-board storage for later transmission when the satellites are in a favorable position is leading to the implementation of GEO stationed relays for real-time transmission and processing of distress signals. Six NOAA spacecraft and two Soviet satellites are planned, with a completed system offering high detection probability, position location, worldwide coverage, coded messages, and high capacity (406 MHz). A significant factor in use of a GEO relay system is noted to be the signal to noise temperature of the repeater.
Document ID
19820063468
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Goudy, P. (Centre National d'Etudes Spatiales Toulouse, France)
Ludwig, D. (Centre National d'Etudes Spatiales Toulouse, France)
Trudell, B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)