| The Pulse-Doppler radar is a new type of radar system. Its signal is very complex. It is widely used, which utilizes the Doppler Shift between the target and the radar to have the target information processed. It can efficiently solve the interference of the ground clutter. With the development of radar technology, PD radar has had more and more widely application, mostly airborne radars use such system.This thesis discusses the key technique of the Pulsed Doppler radar signal processing. The signal processing is discussed in correlative radars. They can restrain jamming signals and clutters which are irrelative with the radar echoes. By the simulation targets' images can be got.The thesis starts from operation principle of PD radar. We discuss the ambiguity resolution of Pulsed Doppler radar. Based on the relevant research results and real demands in LFM radar, this dissertation involves the LFM signal algorithm theory study and realization and its signal features, for instance, coherence, inside pulse modulation character. This dissertation presents an analysis and a research on the modeling and simulation of various kinds of PD radar environment signals, such as target echo, background clutter. Based on radar echo model and radar operating parameters, target and clutter data were simulated by Matlab platform in advance and the pulse compression, side lobe cancellation, clutter suppression, multi pulse accumulation and CFAR of coherent Radar signal processing are introduced and simulated.Specially we study the algorithm and the capability of PD radar's clutter suppression and signal detection. In high-frequency distant system, leak of frequency power will happened in border upon filter after the signal gets cross the filter in frequency domain. We bring forward a more available and exact speed local arithmetic. Simulation results are provided trough changing the parameter of Doppler frequency shift. Aiming at the appearance of edge effect during signal detection, A new method of nimble CFAR which can adapt the environment of multi clutters. Based on the theoretic analysis and computer simulations, pleased results are achieved. |
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