Waveform Design And Pulse Compression For Nonlinear Frequency Modulation Signal

The pulse compression technique is employed widely in modern radar system to resolve the confliction between range resolution and average power. The transmitted waveform of a radar system is the key factor of the performance of pulse compression. This paper expounds two common pulse compression signals, i.e. linear frequency modulation (LFM) and non-linear frequency modulation (NLFM) signals. The optimized design methods of the waveform and modified spectrum filter for NLFM signal are mainly studied.The general design method of NLFM signal waveform is based on the principle of stationary phase with the window functions. The optimization method based on combination windows of NLFM signal is improved. Higher pulse compression performance can be attained by using such waveform.It is also focused on optimization design method of the modified spectrum filter for NLFM signal in this paper. Firstly, a combination window function is applied in the design of waveform and modified spectrum filter is proposed in this paper. Secondly, a modified spectrum filter based on mismatched window (MSFMW) algorithm is proposed. This method is used to design the NLFM signal and the pulse compression filter based on different window functions. Furthermore, a new combination window function in the MSFMW algorithm is proposed, which unites combination window with mismatched one. With these methods, the influence on the pulse compression performance can be regulated by the different window functions and coefficients of the combination windows. The corresponding simulating results are listed to prove the correctness and feasibility of the algorithms.