基于时频分析和综合的GPS抗AM-FM干扰技术

利用Wigner-Ville分布(WVD)将受干扰的GPS接收信号转换到时频域，利用时频综合技术重构干扰信号，根据子空间投影技术的原理将接收信号投影到与干扰信号正交的子空间中，从而抑制干扰信号，仿真分析了经匹配滤波器输出后的信号的误码性能，可知经本文提出的方法处理后的信号比未经预处理的信号抗干扰性能明显增强，约有30 dB的性能提高。

AM-FM Interference Mitigation for Global Positioning System Using Time Frequency Analysis and Synthesis

GPS signal contaminated by interference was firstly transformed into time frequency domain with Wigner-Ville distributions, and then interference was reconstructed using time frequency synthesis techniques. Interference subspace and its orthogonal subspace were created on basis of the principle of subspace projection techniques. Interference was suppressed by projecting the received signal into orthogonal subspace of interference. The BER performance of matched filter output was simulated and analyzed. The simulation results show that anti-jamming performance is approximately improved by 30 dB in comparing between with and without preprocessing methods.