Comparison of Performance Between Two LFM Signals Time-Frequency Transform Using Line Detection

In order to compare the differences between the Wigner-Hough transform(WHT) and Radon-Ambiguity transform(RAT), the expression of input,output signal noise ratio(SNR) and sampling points are deduced basaed on the ergodic property of stationary Gaussian stochastic process, under cases of large sampling points.The realization,computational burden and resolution of RAT are compared with WHT. Simulations testified that WHT by dechirping is more suitable for LFM signals detection and estimation at low SNR.