Accession Number : ADA181107

Title :   DMA (Defense Mapping Agency) Orbit Determination of the Navy Navigation Satellite System 1986.

Descriptive Note : Annual rept. no. 2 (Final) Jan-Dec 86,

Corporate Author : DEFENSE MAPPING AGENCY HYDROGRAPHIC/ TOPOGRAPHIC CENTER WASHINGTON DC

Personal Author(s) : Murphy,J K ; Jones,Robert J

PDF Url : ADA181107

Report Date : 01 Apr 1987

Pagination or Media Count : 42

Abstract : The Defense Mapping Agency Hydrographic/Topographic 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.

Descriptors :   *SATELLITE TRACKING SYSTEMS, *ORBITS, DOPPLER SYSTEMS, NAVIGATION SATELLITES, MILITARY SATELLITES, TELECOMMUNICATIONS, SATELLITE COMMUNICATIONS, EPHEMERIDES, WEATHER, DATA ACQUISITION, NETWORKS, TRACKING STATIONS, POLAR REGIONS, VARIATIONS

Subject Categories : Geodesy
      Active & Passive Radar Detection & Equipment
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE