Target Image And Anti-inference Performance Analysis Based On Phase-code SAR

Phase-coded signal has been widely applied to radar system with its well correlation and low probability of intercept. Broadband transmission signal, which could improve range resolution of Synthetic Aperture Radar(SAR) with proper shape of code, attract more and more attention of researchers. Compared with traditional chirp signal,phase-coded signal with large number of waves diversifies SAR transmission waves and widens the bandwidth. Phase-coded signal has not only well low probability because of its flexible transmitted waveform but also very well anti-interference in the issue of growing compete digital confront.Phase-coded signal applied to SAR imaging and anti-interference applications as transmission signal is mainly studied in the paper.First of all, fundamental theory and research status is introduced in this paper, such as the background and significance of SAR, phased-coded applied to SAR, and basic principle of phase-coded and compressive sensing.Then, phase-coded as transmission signal which is made use of imaging stationary target by SAR is studied with analysis of echo model, deduction of improved RD algorithm and imaging simulation; the algorithm that compressive sensing is applied to azimuth with match filter in distance is proposed, simulation verifies the effective of this algorithm. Next impact moving target is analyzed, compasison with LFM signal, the method of azimuth focusing process with compress sensing is proposed and simulation is the necessary.Last but not least, the application of phase-coded signal to anti-inference is studied and principle of active deception jamming is introduced. Method of m-sequence phase-coded signal applied to SAR anti-inference is proposed, simulation compared with that of LFM signal verifies the effective of this method.