Detect and repair cycle-slip by reconstruction Doppler integral algorithm and STPIR

doi:10.11947/j.AGCS.2021.20190327

Abstract

Abstract: It is necessary to ensure that there is no cycle-slip in the carrier phase for precise positioning. Currently, one cycle-slip is still a difficult problem in double-frequency positioning technology. MW (Melbourn-Wübbena combination) method combined with ionospheric residual method is widely used to detect cycle slip, but the accuracy of MW method is insufficient. Therefore, we develop a novel method called reconstruction doppler integral to replace the MW method. Based on the Doppler model of the signal transmission, it can acquire precise Doppler values with the results only by using the broadcast ephemeris and pseudo range. In order to further improve the performance of the proposed method, reconstruction of dual frequency combined Doppler is proposed and integrated. But this method has the same blind zone of cycle-slip detection as the MW method, so we integrate the STPIR (second-order time-difference phase ionospheric residual) algorithm into the detection method above. We validate the proposed method for the cycle-slip detection on data of two types sampling rate (e.g., kinetic 1 Hz and static 1/30 Hz) containing the simulated cycle-slips. The results show that the detection error of the reconstruction Doppler integral method is smaller than that of the MW method. In conclusion, our method can accurately detect and repair any integer cycle-slips under the above conditions, and the higher the sampling rate, the higher the precision.

Key words: Doppler reconstruction, Doppler of dual frequency combination, STPIR, cycle-slip detection and repair

CLC Number:

P228.1

CAI Chenglin, SHEN Wenbo, ZENG Wuling, YU Honggang, XIE Xiaoping. Detect and repair cycle-slip by reconstruction Doppler integral algorithm and STPIR[J]. Acta Geodaetica et Cartographica Sinica, 2021, 50(2): 160-168.

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