Radar Active Deception Jamming Suppression Method Based On Blind Source Separation

The objective of false target is to destroy the function of target detection and consume radar resource. This dissertation focuses on the range false target jamming and smeared spectrum (SMSP) jamming. At first, the produce process and action mechanism of the two jammings are analyzed. Afterward, the three jamming suppression methods are researched based on the generalized blind sources separations (GBSS) techonology. For instance, subspace oblique blind sources separations (SB-BSS), single channel to dual channels BSS (SCDC-BSS) and slow-time domain BSS(STD-BSS).On the SB-BSS jamming suppression, after the separability of echo and jamming is discussed by the independence of generators, the two deception jamming suppression methods are proposed to suppress the range false target jamming and SMSP jamming, respectively. In order to evaluate the performance of the two methods, the improvement factor of signal to jamming and the computational complexities of the two methods are analyzed.On the SCDC-BSS jamming suppression, the separability of echo and jamming is discussed in time domain by the fourth-order cross cumulant. In allusion to range false target in single channel, the joint approximate diagonalization of eigenmatrices (JADE) BSS technology is used to separate the echo and jamming. Afterward, three identification models based on the phase quantization feature are given to detect the echo and jamming.On STD-BSS jamming suppression, the separability of echo and jamming is discussed in slow-time domain by the correlation coefficient. In allusion to range false target in amplitude-comparison radar, the second-order statistic BSS technology is used to separate the echo and jamming. Then, the two identification models based on the dopple, micro-doppler and RCS features are given to detect the echo and jamming.