论文部分内容阅读
在传统的数字波束形成雷达系统中,为了抑制主瓣干扰,并保持对目标单脉冲角度估计的精度,需要同时形成四个波束。对于大型的雷达天线阵列,数字波束形成通常在子阵上完成。但是对于非矩形天线阵结构,传统的自适应波束形成架构不再适用,单脉冲角度估计的精度会大幅降低。文中针对非矩形平面阵列,提出一种新的自适应波束形成方法。首先,需要对四个接收波束的输出做线性补偿,该补偿因子可通过阵列流形精确计算获得;其次,进行自适应主瓣干扰对消处理;再进行二维数字单脉冲测角。文中在理论推导的基础上,结合相控阵雷达阵列实例给出仿真结果,验证了该方法的有效性。
In the traditional digital beamforming radar system, in order to suppress the main lobe interference and maintain the accuracy of the target single-pulse angle estimation, four beams need to be formed simultaneously. For large radar antenna arrays, digital beamforming is usually done on subarrays. However, for the non-rectangular antenna array structure, the conventional adaptive beamforming architecture is no longer applicable, and the accuracy of the single-pulse angle estimation is greatly reduced. In this paper, a new adaptive beamforming method is proposed for non-rectangular planar arrays. First of all, the output of the four receive beams needs to be linearly compensated. The compensation factor can be obtained through the accurate calculation of the array manifold. Secondly, adaptive mainlobe interference cancellation is performed. Then two-dimensional digital single-pulse angular measurement is performed. Based on the theoretical derivation, the simulation results are given with the example of phased array radar array, and the validity of the method is verified.