Quasi real-time clock estimation of BDS+GPS with no-difference observation

doi:10.13474/j.cnki.11-2246.2019.0146

Abstract

Abstract:

The inscrutability of satellite clocks is one of the most important factors affecting real-time precise positioning. To obtain high accuracy position and zenith troposphere delay(ZTD) quickly, a strategy focusing on quasi real-time clock estimation delaying on hour is put forward. No-difference observation model is chosen during our procession. The proposed strategy consists of calculation of ultra-rapid orbits and estimation of clocks. Experiments show that average 3D RMS of 3 h prediction starting from 2 of GPS, BDS GEO and BDS IGSO+MEO are 3.85, 81.4 and 21.74 cm respectively. Precision of quasi real-time estimation of GPS clock based on ultra-rapid orbits is 0.054 ns and that of BDS clock is 0.12 ns. Finally, static PPP experiment ensures the availability of orbits and clocks.

Key words: ultra-rapid orbit, clock, quasi real-time, BDS, GPS

CLC Number:

P228

ZHENG Tao, XU Aigong, TANG Longjiang, XU Zongqiu, YANG Hu. Quasi real-time clock estimation of BDS+GPS with no-difference observation[J]. 测绘通报, 2019, 0(5): 39-43,76.

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