Accuracy evaluation of MGEX broadcast ephemeris orbit and clock correction

doi:10.13474/j.cnki.11-2246.2020.0401

Abstract

Abstract: In order to evaluate the accuracy of the broadcast ephemeris provided by MGEX, the mathematical model of calculating the position of the satellite in the earth fixed coordinate system is derived, and the basic principle and method of evaluating the broadcast ephemeris by the precise ephemeris are summarized. With the help of the broadcast ephemeris products provided by MGEX system, the mean value and RMS value of orbit and clock error of GPS satellite broadcast ephemeris provided by MGEX system are compared and analyzed. The experimental results show that except the mean value of clock error is greater than 8 ns and the orbit error RMS of individual satellite is more than 4 m, the orbit precision of 7 d and 27 d broadcast ephemeris provided by MGEX is better than 3 m, and the clock error is less than 6.5 ns, which provides reference for users using MGEX broadcast ephemeris.

Key words: MGEX, broadcast ephemeris, orbit error, satellite clock difference, accuracy assessment

CLC Number:

P228

LI Honghui, LI Jiangang. Accuracy evaluation of MGEX broadcast ephemeris orbit and clock correction[J]. Bulletin of Surveying and Mapping, 2020, 0(12): 101-105.

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