http://swrc.ontoware.org/ontology#UnrefereedArticle
NNSS translocation test in the Kanto district with special application to Antarctic research program
en
P(論文)
Shibuya Kazuo
Kitazawa Yukihito
National Institute of Polar Research
Department of Earth Sciences, Ibaraki University
Simultaneous receiving of NNSS satellites was made at the three stations, Tsukuba, Dodaira and Tokyo during 19-26 May 1984 and performance of translocation was tested with changed combination of reference points. The Cartesian coordinates of these receiving points are determined within 2m error in each axis by the precise ephemeris point-positioning and the test is made by estimating the radial offset between the translocation solution point and the above-specified standard point. Since the translocaiton is based on the broadcast ephemeris system and the standard points are in the precise ephemeris system, coordinate transform is required before direct comparison of the station coordinates. Tests showed that LeRoy's transform formula is appropriate in the region concerned, though 1.5-2.0m transform discrepancy has to be considered. Since the translocation is a relative positioning technique of one station with respect to the other reference point, the error in the reference point may affect on the accuracy of translocation solution. Tests showed that when the "bug station" with large coordinate errors was used as the reference point, the involved errors transferred to the coordinates of the translocation solution point. It is thus imoprtant to use the reference point which is determined as accurate as possible. When the translocation is made relative to thus determined standard point, the convergence of the translocation solution can be obtained with a smaller number of satellite passes. The necessary passes to maintain 5m absolute accuracy including uncertainty in the coordinate transform are found to be reduced under 10; the number is about one-fourth of the necessary passes for the same convergence in case of broadcast ephemeris point-positioning. The operational difficulty in the Antarctic field research programs may be lightened because staying time at one receiving site will be reduced within 24h by an application of translocation technique.
AA00733561
Memoirs of National Institute of Polar Research. Special issue
43
23-36
1986-09