Research on GPS/BDS/GLONASS dual-frequency RTK positioning algorithm

doi:10.13474/j.cnki.11-2246.2020.0012

Abstract

Abstract: In the double difference observation equation, the double difference ambiguity loses the whole circumference characteristics for using FDMA technology for GLONASS. To solve it, this paper proposes a method based on the interstation single difference ambiguity, and additional ambiguity parameters Kalman filter, it implements GPS/BDS/GLONASS combined RTK positioning. The RTK program is used to solve measured short baseline data of the GPS, BDS and GLONASS dual-frequency, and the stability and positioning accuracy in other RTK modes are compared and analyzed. The results show that the fixed rate of ambiguity of GLONASS single frequency and dual frequency positioning is 99.8% and 99.7%, respectively, and its positioning accuracy is not much different from BDS and GPS. In single-frequency or dual-frequency RTK positioning, the stability and positioning accuracy of the dual-system and three-system combined positioning are significantly higher than that of the single system. The stability of the three-system combined positioning is the best and the highest precision. As the frequency increases, the initialization time is significantly reduced, providing the possibility to achieve a fixed solution for a single epoch.

Key words: GPS/BDS/GLONASS, RTK, dual-frequency, Kalman filter, single difference ambiguity

CLC Number:

P228

CHEN Wentao, CHENG Pengfei, XU Yantian. Research on GPS/BDS/GLONASS dual-frequency RTK positioning algorithm[J]. Bulletin of Surveying and Mapping, 2020, 0(1): 55-60,70.

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