一种有效的宽带宽角相控阵接收干扰置零新方法

采用拉伸处理可以在目标方向形成接收主瓣,并能降低宽带宽角相控阵雷达接收信号的带宽,易于工程实现.为了在干扰信号功率远大于目标回波信号功率时获得较大的输出信干比,提出了一种宽带干扰置零新方法.在干扰离目标的空间角度间隔较大时,能在干扰方向准确形成零陷,新方法窄带权系数的零点约束角度会偏离实际干扰方向.偏移方向与信号形式有关,而偏移角度大小与雷达信号相对带宽、干扰离目标的空间角度间隔有关,其值在信号参数给定后可通过离线估计得到.计算机仿真结果验证了新方法的有效性.

Received interference nulling for wideband phased arrayin the presence of large scan angle

The beamforming method based on stretch processing can greatly decrease the frequency bandwidth of wideband phased array radar signal and is easily implemented in engineering. In order to upgrade the output signal to interference ratio, a new method of wideband interference nulling is presented when the power of the interference is larger than that of the target echo. The nulling direction of the narrowband weight used in this method would deviate from the actual direction of wideband interference arrival if the spatial angle between the target and interference were larger. The deviation direction is related to radar signal form, and the deviation angle is related to radar relative bandwidth and spatial angle between the target and interference, and can be obtained by the offline estimation of the given radar signal parameters. Simulation results show the effectiveness of the proposed method.