Research On Performance Analysis And Evaluation Of LPI Radar Signal

LPI radar signal is becoming more and more important,in order to promote the development of LPI radar signal design technology,this paper evaluates and analyzes the performance of LPI radar in all aspects.Based on the common eight kinds of LPI radar.The waveforms of the signal are presented with the evaluation algorithm of stealth performance,detection performance and anti-jamming performance.The simulation and comparison of the performance of different signals and different parameters are carried out and the results are briefly analyzed.The details are as follows:In the second chapter,a brief introduction and characteristic analysis of the common LPI radar signals are carried out.Based on these signals,the performance evaluation simulation experiment is carried out in the following chapters.In the third chapter,the evaluation scheme of signal stealth performance is given,and the LPI performance and LPE performance evaluation method are segmented based on radar signal interception and recognition.Based on the total-sub-model,the integrated stealth performance evaluation algorithm based on the asymptotic spectral distribution of wigner matrices is introduced,and then the LPI evaluation factor and the LPE evaluation algorithm based on recognition rate are introduced respectively.The simulation results show that the stealth performance of the Costas frequency hopping coding,phase coding and Costas-Barker modulation signal is better than that of the LFM and sinFM signals.For the same signal,the longer the coding bits,The greater the equivalent bandwidth,the better the performance.Based on the approximation of the ideal fuzzy function,a similarity algorithm of the central local gradient is proposed.Based on the similarity of the signal and the approximate ideal fuzzy function,the optimal performance of each signal is analyzed.The simulation results show that the performance of Costas-Barker modulation is the best,followed by Costas frequency hopping coding signal and phase coded signal,and the performance of linear and sinFM signal is relatively poor.In the fifth chapter,we introduce several kinds of suppression interference and deception jamming in radar jamming.Based on each kind of interference,the anti-jamming performance analysis of each signal is carried out.The simulation results come form the jam-to-signal ratio,the number of false targets and main-to-side false targets ratio,and the results show that Costas frequency hopping coding signal and sinFM signal with better anti-suppression interference;frequency hopping coding and Costas-Barker modulation signal have a good effect of suppressing the amplitude of the sidelobes in the spoofing interference.But come with the forward replication forwarding interference,although these two signals are relatively few in the number of false targets,they produce the sidelobe false target Of the amplitude is relatively high,this time should be based on the specific application scenarios to select the appropriate signal.