| Citation: | CHU Ti, HE Kaifei, GAO Fan, et al. Coastal GNSS-R ocean altimetry based on code delay of QZSS L1 signal[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(4): 691-697. doi: 10.13700/j.bh.1001-5965.2020.0630(in Chinese)
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In order to explore the altimetry performance of GNSS-R code phase delay measurement with different modulation methods in GNSS LI band signals, a coastal dual-antenna GNSS-R ocean altimetry experiment was carried out, and the original intermediate frequency data with a sampling rate of 40 MHz was collected. The experimental data was processed using the self-developed GNSS-R altimetry software receiver and inversion software, and the GNSS-R ocean altimetry results of QZSS L1C/A code and L1C code were obtained simultaneously. Then we compare them with the measured values of the radar altimeter that were simultaneously observed coastally, and used to evaluate the accuracy of the GNSS-R inversion result. The experimental results show that the ocean altimetry accuracy based on L1C/A code and L1C code is about 0.63 m and 0.4 m, respectively. It can be seen that the GNSS-R measurement accuracy of the L1C code delay is significantly higher than that of the L1C/A code. In addition, the accuracy of GNSS-R will be improved as the satellite elevation increases gradually.
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