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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。
The advantages and disadvantages of two schemes of adaptive zeroing and anti-interference antenna system are compared. According to the practical application, the anti-interference antenna scheme is designed as a digital zeroing system with intermediate frequency output. The signal processing of adaptive zeroing is theoretically studied and the model of the array signal is established. According to the fact that the navigation satellite signal is much smaller than the interference signal and other factors, the power inversion algorithm based on linear constraint is selected. By adjusting the weighting coefficient, The zero point of the pattern is aimed at the direction of the interference signal to realize interference nulling. The simulation results show that the anti-jamming capability of 77dB can be achieved by zero-offset processing, which verifies the effectiveness of the algorithm.