A Study of GPS Satellite Orbit Adjustment Using P-Code Pseudorange Data

• Main Authors: Hwang Miin-Yang, 黃敏揚
• Other Authors: L.C. Chou
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/64819862198545290097

碩士 === 國立成功大學 === 測量工程學系 === 81 === The precise GPS satellite orbits play a quite important role for the application of GPS to high accurate long baseline solution or plate tectonic motion. It is true that we will face some difficulties in orbit determination, such as how to use correct initial values for position and speed of satellite and what is the perfect force models acting upon satellite. In addition, orbital arc length will also affect adaptability of models used. The research concentrates on daily orbital arc adjustment using P-Code pseudorange. The methods of orbit adjustment are include the Weighted Least Square Method and Hill's function Method. The effect of using different regional tracking net- works is also evaluated. Based on the results from the tracking data experiments, it is not significant to detect errors of force models of daily orbital arc. This implies errors of daily arc can be improved by only adjusting initial values. In addition, using adaptive regional tracking network, such as enclosing the Pacific Ocean region including Taiwan, can reach orbit accuracy at better than 0.5ppm level (related SIO precise ephemeris).