In this paper we propose a new denoising method of radar reflected signals. Using signal processing techniques such as the short time Fourier transform (STFT) and the chirplet transform, various parameters of signal can be extract. In this paper we can obtain the signal's parameter by using the chirplet transformation as a tool to denoise the signals. We have already tested this algorithm on the real data and have obtained chirplet transformation has the perfect results on system identification by denoising returned signal.