Low Probability Of Intercept Radar Signal Processing And Hardware Simulation

With the development of the modern electronic warfare and technology of ECM, LPI radar is an important developing aspect of modern radar technology. It is very difficult to detect, identify, localize and tract the LPI radar signal with the traditional interception receiver. How to detect signal and estimate parameters under low SNR is very important in the digital signal processing. The research in this field is belongs to the frontier of modern electronic warfare field because of the computational complexity of the algorithms and hardware limitation.The paper is concerned about the detection signal and estimation parameter of linear frequency modulation(LFM) signal and polynomial phase signal(PPS). The contents of the paper are summarized as follows:For the problem of LFM signal detection, a method named as muti-LFM signal time-frequency representation basing on Radon-ambiguity transform filtering and fractional Fourier transform is lucubrated. This method may separate the different signals from the received signal.See the received LFM signal as the two parts with the same chip rate and different beginning frequency in low SNR, can dechip the one with the other. A method combining segmented correlation dechiping with local searching dechiping in condition of the only one LFM signal is introduced.Basing on filter banks time-frequency detection method, a method on filter banks short time Radon-Wigner transform is lucubrated for detecting the only one PPS.For the problem of PPS parameter estimation, the DPT method is lucubrated. This method may estimate the highest order of PPS. According to the property of 3rd order PPS, an efficient method combining the segment correlation with LFM parameter estimation is introduced.Otherwise, the paper is concerned with the property and application of the new float DSP chip TMS320C6701, the structure of TMS320C6701 EVM board and the software Code Composer Studio(CCS). The algorithms in the paper are testified on the board.