| Citation: | CHENG Qi, SUN Rui, WANG Junhuiet al. Multipath effects on velocity measurement from GPS Doppler observations[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(9): 1807-1813. doi: 10.13700/j.bh.1001-5965.2020.0311(in Chinese)
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Global Positioning System (GPS) Doppler observation is affected by multipath, which leads to a huge error in velocity calculation. In response to this problem, starting from the causes of Doppler observations, through kinematic analysis, a model of the relationship between the overall motion of receiver, reflection point and the satellite, and the error of Doppler observations is constructed. The results show that: the error of Doppler observations is related to the satellite observation vector, the tangent normal vector of the reflection point, the speed of the receiver and the reflection point. The effectiveness of the proposed model is verified by the results in 5 different scenarios. When receiver and reflection point are moving, multipath may cause a huge error in velocity, which makes the velocity unreliable.
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