DMA (Defense Mapping Agency) orbit determination for transit satellites: 1985

Statistics – Computation

Scientific paper

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Earth Orbits, Navigation Satellites, Orbit Calculation, Satellite Orbits, Accuracy, Mapping, Military Spacecraft, Precision, Stability, Time

Scientific paper

Since 1975, the Defense Mapping Agency (DMA) has been computing precise orbits for the Navy navigation satellites, OSCAR series. In mid-1981, DMA began computing precise orbits for the NOVA-1 satellite and, in early 1985, for the NOVA-3 satellite. Currently, DMA determines precise orbits for the three OSCAR and two NOVA satellites which comprise the TRANSIT System. This paper presents a comparison of computational results for these satellites with regard to orbit accuracy, time (oscillator) stability, and polar motion. The comparison is made for results obtained for 1985.

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