Combination Of Pulse Pressure Waveform Design And Signal Characteristics

Radar, serving as a kind of method for detecting, is a important part in the military field. According to the points of high tech local war happened last several decades, especially with increasing emergence of indetectable, higher defending-ability is required more. It is very important to carry out the research of Radar signal designing and data processing method in order to improve the sensitivity and detecting ability of Radar system and to provide practical waveform and signal processing technology for future advanced Radar. This dissertation mainly studies the pulse compression waveform designing and signal processing, including the following aspects:Firstly, by the pulse compression basic theory, the linear frequency modulation signal (LFM), binary phase-coded signal (BC) and stepped-frequency (SF) signal are discussed respectively including the ambiguity function, pulse compression and spectrum characteristic. The Doppler characteristic of the first two kinds of compression signals are analyzed and the output results of the pulse compression signals are given in different mismatch cases. The methods of range sidelobe suppression about the LFM and BC signal are discussed in detail. For LFM signal, we demonstrate the method of employing Hamming weighting, spectrum correcting and phase modulation distortion. For binary coded signal, we only introduce the network weighting method. Moreover, the signal processing method of high range resolution based on Inverse Discrete Fourier Transform is analyzed. The synthetic high range resolution of the several scatters is simulated.Secondly, this dissertation analyses the method of waveform designing and processing for three hybrid pulse compression signals. The combined signals are improved on the characteristic than the single modulation mode. Though theory analysis and simulation, the spectrum characteristic, ambiguity function and resolution are analyzed. The simulation results show that these hybrid signals are LPI Radar signals. The processing of these hybrid signals is different from the single modulation signal, that is pulse compression twice. With respect to the hybrid signals including SF, the high range resolution is analysis, and the method for reducing sidelobe level is...