Radar Pulse Compression Techniques And Their Time-frequency Analysis

Time-frequency analysis has got great attention in recent years. As a bilinear Time-frequency distribution, Wigner-Ville distribution, which has the energy representation of signal, has been greatly used in the processing and detection of nonstationary signals. Linear frequency modulated (LFM) signals as the most popular pulse compression signal are a typical kind of time-varying, nonstationary signals, so applying the Wigner-Ville distribution into LFM signals has more advantages than conventional methods.In this paper, firstly, radar pulse compression is introduced briefly, summarize three primary pulse compression signals: LFM, NLFM, PCM.Secondly introduce two realization means of pulse compression: time-domain realization and frequency-domain realization. Then a pulse compression system based on frequency-domain means is presented.Finally, after discussing Time-frequency analysis theory in general, Wigner-Ville distribution for LFM signals are presented, the effect of matching filtering and Doppler shift are demonstrated. The cross item appearing in the condition of multi-component is investigated also.The results of simulation testify that Wigner-Ville distribution is able to show the frequency shift of LFM signals in the pulse compression, and a good qualitative visualization of the effect of the Doppler shift is obtained too. This means Time-frequency analysis could have some qualitative use in the radar signals detection and the modeling of radar system.