Low SNR FMCW Signal Processing with Prior Information

摘要

Aiming at the range ambiguity problem of wideband and low SNR (signal-to-noise ratio) FMCW (frequency modulated continuous wave) signals under severe measurement conditions, a solid surface FMCW signal model is built. Besides, based on prior information, a distance inversion method is proposed, which contains signal pretreatment, band intercepting and energy weighting. Actual data processing results show that, SNR of the frequency spectrum has been raised from -5.55dB to 8.32dB after pretreatment; and the final results show that index of similarity of stock level shape respectively raised from 0.46 to 0.71 and 0.79.