GPS欺骗式干扰环境下MVDR算法的性能分析

Performance analysis of MVDR algorithm in GPS deception jamming environment

经典MVDR算法在GPS压制式干扰环境下的表现出色,为分析MVDR算法在欺骗式干扰环境下的性能,根据该环境下信号、干扰的功率都淹没于噪声功率之下的特点,推导出阵列天线采用MVDR算法后的方向图增益和输出信干噪比的近似表达式。通过仿真实验,分析验证了MVDR算法在欺骗式干扰环境下失去了抑制干扰能力的原因,并讨论了影响阵列输出信干噪比变化的因素及其随各因素变化的规律。

The classical minimum variance distortionless response （MVDR） algorithm has an excellent performance in the GPS blanket jamming environment. To analyze the performance of the classical MVDR algorithm in deception jamming environment, we derive an approximate expression of the array gain and output signaltointerferenceplusnoise ratio according to the fact that desired signal power and interference power are far below noise power. Combined with the simulation results, we figure out the reason why the MVDR algorithm loses the ability of interference suppression in the deception jamming environment. In addition, we also discuss the factors that impact the output signaltointerferenceplusnoise ratio and the way they work.