Abstract
An important observation of GNSS-R is Delay-Doppler mapping (DDM). According to the requirement of GNSS-R signal real-time processing, a fast processing algorithm of GNSS-R signal based on double block zero padding (DBZP) and frequency domain rotation transformation is proposed for DDM generation. The reflected data is blocked and then correlated, which avoids the FFT calculation with too long points. The block and zero padding operations not only guarantee the full search of the pseudo code phase, but also avoid the repetitive calculation. In the frequency domain, the correlation results at different Doppler frequencies are approximated by the rotation transformation method, which avoids a large number of carrier multiplication operations and effectively reduces the computational burden. The computational burden and computational loss of parallel code phase correlation algorithm and fast algorithm are analyzed. Finally, the UK-DMC satellite-borne reflected data are processed by two algorithms and the simulation time-consuming and processing results were compared. The results show that the fast algorithm greatly shortens the DDM generation time and the loss of the processing result is small.
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Han, L., Meng, Y., Wang, Y., Han, X. (2017). A Fast Algorithm of GNSS-R Signal Processing Based on DBZP. In: Sun, J., Liu, J., Yang, Y., Fan, S., Yu, W. (eds) China Satellite Navigation Conference (CSNC) 2017 Proceedings: Volume I. CSNC 2017. Lecture Notes in Electrical Engineering, vol 437. Springer, Singapore. https://doi.org/10.1007/978-981-10-4588-2_16
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DOI: https://doi.org/10.1007/978-981-10-4588-2_16
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