卫星导航接收机空间自适应调零抗干扰技术研究

Research on Space Adaptive Null-steering Anti-jamming Technology of Satellite Navigation Receiver

比较了两种自适应调零抗干扰天线系统方案的优缺点,根据实际应用场合,确定抗干扰天线方案设计为中频输出的数字调零系统。对自适应调零的信号处理进行了理论研究,建立了阵列信号的模型,根据导航卫星信号远小于干扰信号等因素,选用了基于线性约束的功率倒置算法,通过调整权值系数使得天线阵的方向图零点对准干扰信号方向,实现干扰零陷。仿真结果表明:通过零陷处理可达到干信比为77dB的抗干扰能力,验证了算法的有效性。

Two kinds of adaptive null-steering anti-jamming antenna schemes were compared,and the intermediate frequency-output digital one was chosen according to practical application situation.The signal adaptive null-steering processing theory was studied and the array signal model was described.According to that the navigation system signal much smaller than the interference signal,the power-inversion algorithm based on linearly constrained minimum variance was chosen to let the null direction of radiation pattern aim at the direction of interference signal by adjusting weight,then the null-steering was realized.The simulation results showed that the anti-jamming capability reached 77dB through null-steering processing,which validated the algorithm.