WANG Shibo,LI Ying,QIN Lingyu.GNSS-R significant wave height inversion method based on delay-Doppler maps[J].Optics and Precision Engineering,2022,30(08):1011-1017.
WANG Shibo,LI Ying,QIN Lingyu.GNSS-R significant wave height inversion method based on delay-Doppler maps[J].Optics and Precision Engineering,2022,30(08):1011-1017.DOI: 10.37188/OPE.20223008.1011.
GNSS-R significant wave height inversion method based on delay-Doppler maps
In order to realize the detection of significant wave height, this paper uses GNSS-R (Global Navigation Satellite System Reflection) to propose an significant wave height inversion method based on delay-Doppler maps for signal-to-noise ratio(SNR) calculation. Compared with active detection such as traditional radar, GNSS-R is a passive observation using forward scattering of satellite signals, without transmitter. It has the advantages of more signal sources, low power consumption, low cost and light weight, which is convenient to be built on space-borne, airborne and ship-borne platforms. Due to the different significant wave height, the reflected signal received by the receiver is also different. Through the analysis of the reflected signal, we can get the physical characteristic information of different reflectors, so as to reflect the required significant wave height information. In this paper, the delay-Doppler map is generated by the reflected signal, and the corresponding SNR definition is given to obtain the significant wave height. In order to verify the feasibility of the algorithm proposed in this paper, the inversion experiment of significant wave height on board is carried out, and the performance is compared and verified with the traditional estimation method using interference complex field (ICF) for inversion. The results show that the root m
ean square error of the proposed algorithm is 0.098 m, the R
2
value is 77 %, and the correlation coefficient is 0.82, which are better than those of the ICF method. The proposed algorithm has better consistency with the significant wave height data of the wave radar, which improves the accuracy of the significant wave height estimation based on GNSS-R technology, and can provide services for the significant state information perception of ship navigation.
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