Fast parameter-estimation of LFM signal based on improved combined WVD and randomized hough transform

In order to solve the problem of calculation and storage in traditional Hough transform and improve the computation speed and veracity in the LFM signal parameter estimation, the time-frequency character of single-component LFM signal with noise was obtained by Wigner-Ville distribution(WVD), the instantaneous frequency was estimated using a maximum value method; the parameter estimation was realized though randomized Hough transform (RHT) based on a section of the frequency. The computed and analyzed results show that, compared with the troditional WVD-HT, WVD-RHT has lower computation load and better practicability, in which the computation time is about one third of WVD-HT, but the estimation precision is higher than WVD-HT.