DMA (Defense Mapping Agency) Orbit Determination of the Navy Navigation Satellite System 1986.
Annual rept. no. 2 (Final) Jan-Dec 86,
DEFENSE MAPPING AGENCY HYDROGRAPHIC/ TOPOGRAPHIC CENTER WASHINGTON DC
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The Defense Mapping Agency HydrographicTopographic Center DMAHTC performs precise orbit computations for Navy Navigation Satellite NNSS satellites also called TRANSIT, using Doppler observations collected by a worldwide network of stations. Equipment at these sites is configured around either a Tranet II or a Magnavox 1502 DS receiver. Table 1 lists the current stations while Figure 1 shows the tracking network configuration. Recorded Doppler counts, surface weather measurements, and other appropriate data are transmitted daily via satellite communications or over telecommunication links to DMATHC for processing, time corrections and orbit determination. There are two classes of NNSS satellites -- the Oscar and the Nova. The Nova satellites represent the latest generation of TRANSIT satellites. For Nova satellite 30480 and Oscar satellites 30110, 30130, 30200 and 30300, data were processed in two-day fits. For Nova satellite 30500, data were processed in one-day fits. Keywords Tracking stations Tracking networks Transit satellite Nova satellite Oscar satellite Doppler polar positions Emphemeris availability Time stability.
- Active and Passive Radar Detection and Equipment
- Spacecraft Trajectories and Reentry