The Impact of Data Blocks Update in Broadcast Ephemeris on Real-time Velocity Estimation

doi:10.13474/j.cnki.11-2246.2017.0280

Abstract

Abstract: Real-time precision velocity plays an important role in many fields. Time-difference carrier phase(TDCP)is an effective way to obtain the real-time velocity with high accuracy by differencing successive carrier phases.Thus,it will be affected by the discontinuity of satellite orbits and clocks caused by the updating of broadcast ephemeris.In this paper,we introduced the principle of TDCP at first.Then,we analyzed the spikes magnitude of orbits and clocks as well as their impact on velocity estimation.Finally,we proposed a new data processing strategy,unifying the broadcast ephemeris between successive epochs.A static test was conducted in real-time mode using single frequency GPS data,and the results showed that the accuracy of velocity estimation can reach 1~3mm/s.

Key words: TDCP, broadcast ephemeris, stand-alone real-time velocity estimation, GPS

CLC Number:

P228

XU Yun, ZHENG Kai, GUO Fei. The Impact of Data Blocks Update in Broadcast Ephemeris on Real-time Velocity Estimation[J]. 测绘通报, 2017, 0(9): 23-27.

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