The satellite orbit predictor, a graphical aid for determining the relationship between the satellite (SARSAT or COSPAS) orbit, antenna coverage of the spacecraft and coverage of the local user terminals (LUT), is discussed. The predictor allows the user to quickly visualize if a selected position will probably be detected and is composed of a base map and a satellite track overlay for each satellite. Additionally, a table of equator crossings for each satellite is included. In order for a LUT to receive emergency locator transmitter (ELT)/emergency position indicating radio beacon (EPIRB) information from a satellite, mutual visibility between the satellite, LUT and ELT/EPIRB must occur. Mutual visibility requires two simultaneous conditions: (1) the satellite subtrack or ground track must lie within a LUT coverage circle for a least 4 minutes; and (2) and the suspected ELT/EPIRB must lie within the satellite antenna coverage swath during the 4 minute period. The base map is a polar stereographic projection of the Northern Hemisphere. The LUT coverage circles are based on the LUT seeing the satellite at the horizon. On projections of this type, equal increments of latitude are not equidistant. Therefore, the map includes a dot matrix in the ocean area with dots printed as a one degree latitude by one degree longitude field. Another property of the projection is that the center of the LUT coverage does not coincide with the actual geographical position of the LUT.
COSPAS-SARSAT Satellite Orbit Predictor, Volume 7
1986
124 pages
Report
Keine Angabe
Englisch
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