| Pulse Doppler radar, as a classic example of modern radar, is widely used in every field because of the advantages of its performance. Radar signal processing technology is the core technology of the development of radar technology. Pulse Doppler radar signal processing technology mainly includes signal selection, quadrature sampling and pulse compression, moving target detection and constant false alarm detection technology, etc. Any part of the processing speed and accuracy directly determines the quality of radar performance. The paper emphasizes the discussion and research on how to improve the speed and precision of the signal processing in the signal selection, quadrature sampling and pulse compression signal, on the basis of technical improvement to achieve optimized the pulse Doppler radar signal processing.First of all, the linear frequency modulation signal, two phase coded signal modulation signal and linear frequency modulation and barker code combination signal are analyzed and contrasted based on the fuzzy function and low intercept probability. Analysis results show that the linear frequency modulation and barker code modulation signal has the superiority. The paper uses combination modulation signal for the whole system simulation of signal processing system. The paper also analyzes the basic principle of digital orthogonal sampling, Multiphase structure increase performance of low-pass quadrature sampling are analyzed and discussed. According to the paper, the ratio of main lobe and side lobe is low in the conventional linear frequency modulation pulse compression radar. Doppler frequency shift coupling effects on radar ranging precision. Using double Kaiser window to replace conventional Windows to solve the problem of main lobe and side lobe ratio of Combination modulation signal is low after pulse compression. In view of the Doppler frequency shift-distance coupling ranging error problem, this paper uses the positive and negative slope FM method to compensate the error and correction. Finally, the technology of moving target detection and constant false alarm detection is described, simulated, and verified.In accordance with the features of the Doppler radar signal, the maximum approximate simulation is conducted in the paper in order that the simulation result is as close as possible to that in the actual situation. In addition, the optimized signal processing system is used for the first time to conduct a whole-system simulation of linear frequency modulation and barker code modulation signal. The precision and speed of signal processing is greatly improved because of optimization inspect of its large room for improvement. Therefore, the methods discussed in the paper have their own research value and application potential. |
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