卫星导航接收机空间自适应调零抗干扰技术研究

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.

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

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