| Countries around the world have paid great attention to the wideband radar for the both advantages of stronge anti-jamming and high range resolution. This dissertation has analyzed the low probability of intercept and the anti-jamming performance.Firstly the properties of broad band radar target echo and its distance migration were discussed, several kinds of broad band signal detecting methods were introduced, the result that the broad band radar target was the superposition of multi-scattering centers was verified through simulation. Then the measures to obtain low probability of intercept(LPI) were discussed according to the LPI factor of radar, also discussed were the several kinds of common LPI radar signal forms. After that the fundamentals and system structures of orthogonal frequency division multiplexing(OFDM) radar signal, some categories of jamming forms were introduced based on the OFDM technology, then several anti-jamming techniques were presented according radar jamming characteristics. Finally the OFDM signal, shortened M sequence and the anti-jamming performances of linear frequency modulated (LFM) signal were simulated under MATLAB, analyzing and comparing the results, it showed that anti-jamming performances of shortened M sequence were better than OFDM signals and LFM signal, meanwhile OFDM signal was one of the common used LPI anti-jamming radar signals for its complicated and changeable waveform, flexible design etc. |
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