| Citation: | LI Wei, ZHU Yunlong, WANG Feng, et al. GNSS multipath signal model and altimetry method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(6): 1239-1245. doi: 10.13700/j.bh.1001-5965.2017.0417(in Chinese)
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The method of global navigation satellite system-interferometric reflection (GNSS-IR) was developed to realize the altimetry. The model of global navigation satellite system-multipath reflection (GNSS-MR) was analyzed in depth. A single antenna height measurement model was proposed to obtain the signal-to-noise ratio (SNR) and frequency information of multipath signals, so as to reverse the height information. The Lomb-Scargle (LS) periodogram is a commonly used extraction method of the height measurement model of single antenna. In this paper, a new method based on analytic model fitting method was proposed and the frequency information can be acquired accurately for the SNR of the multipath signals. Thus the height of antenna to ground was reversed. On this basis, the maximum measurement height and the minimum output rate required by the receiver were discussed. From the analysis of experimental data, it can be concluded that when the best results of inversion are obtained, that is, as for LS periodogram, when the upper limit of elevation angle reaches to 17°, the RMSE is 0.028 75 m; as for the fitting method, when the upper limit reaches to 21°, the RMSE is 0.024 85 m. By comparing the RMSE of different upper limit of elevation angle, the best condition of height inversion can be retrieved. And it can also prove the practicability of the fitting method.
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