Fast Parameters Estimation of LFM Signals via Radon-Wigner Transform

摘要

The line integral of Radon-Wigner Transform (RWT) can transform the line in Wigner-Ville distribution into a point in the plane, which can be used to estimate the chirp rate and initial frequency. The calculation is costly because of two-dimensional (2-D) searching in the plane. Therefore, how to improve calculation velocity is the key of RWT method. Multi-resolution fast parameters estimation algorithm for Linear Frequency Modulation (LFM) signals via RWT is offered in this paper. The analysis results indicate that RWT is similar to Radon-ambiguity Transform (RAT) in calculation load. Performance of the parameters estimation is studied based on Residual Expansion Coefficient (REC) and Frequency Deviation Coefficient (FDC). Simulation results show that the algorithm has reached the Cramer-rao Bound (CRB) even on low SNR. The method has prospective benefits of parameters estimation for multi-component LFM signals.