Algorithm for determintion of a satellite orbit and geodetic parameters by using laser ranging data and preliminary results of its application.
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AbstractA satellite laser ranging system was installed at the Simosato Hydrographic Observatory and the satellite observation has been continued since March, 1982. To process the range data and to obtain satellite orbits and geodetic parameters, an orbital processor using numerical integration has been developed. The processor includes the terms of the non-spherical force due to the geopotential, lunisolar and planetary forces, radiation pressure, atmospheric drag and tidal effects of the solid earth and ocean. The algorithm and formation of the processor are described here. The processor is applied to the range data obtained at the observatory and other laser sites in the world to determine the position of Simosato site in the global geocentric coordinate system. The coordinate of the intersecting point of azimuth and elevation axes of the laser ranging system at Simosato site is obtained on the basis of the LPM 81.12 coordinate system. The preliminary result is 33° 34’39”. 697N (latitude),135° 56’13”. 156E (longitude) and 100.66 meters (height from the reference ellipsoid: A=6378 137.0 m, 1/f=298.257). The comparison of the result with the geodetic coordinate surveyed in the Tokyo Datum derives the datum shift correction from the Tokyo Datum to the LPM 81.12 system as ΔU=-142.5 m，ΔV=+510.4 m and ΔW= +681.2 m. If the position of the origin of the Tokyo Datum is expressed in the LPM 81.12 system by using the datum shift correction, the values of the position is shifted by +11”. 71 in latitude and -11”.83 in longitude on the basis of the values expressed in the Tokyo Datum and the shift amounts to 468 meters to the direction of 321 degrees in azimuth. According to the results of the lunar laser ranging, an eastward rotation of the LPM 81.12 system of 0”.197 makes the same longitude for the reference point of the 2. 7 meter telescope at the McDonald Observatory. If it is applied to the longitude of Simosato site, the datum shift correction changes to ΔU=-146.0 m，ΔV=+506.7 m and ΔW=＋681.2 m.The new expression for the position of the origin of the Tokyo Datum obtained by using this datum shift correction on the basis of the lunar longitude system is given as 35° 39’29”. 217N (latitude), 139° 44’28”. 878E (longitude). Key words: Orbital determination, Minimum Variance estimate, Satellite laser ranging, Tokyo Datum
JournalReport of Hydrographic and Oceanographic Researches