只利用一种模拟加权的子阵级和差波束旁瓣抑制方法

The Approach Suppressing Sidelobe of Sum Beam and Different Beam only Adopting One Kind of Analog Weighting

对于采用单脉冲技术的子阵级相控阵雷达系统,需要同时对和、差波束的旁瓣进行抑制。该文研究阵元级只用一种模拟加权,同时结合子阵级数字加权的和、差波束旁瓣抑制方法。通过构造阵列的和、差输出通道,并对假想的位于和、差波束整个旁瓣区域内的干扰进行最优自适应滤波来确定模拟加权。为改善旁瓣抑制效果,子阵级进一步采用数字加权,以逼近常规的Taylor和Bayliss加权。该方法有效地降低了硬件成本与复杂性,并充分利用了数字处理的灵活性。本文纠正了有关文献中求解模拟加权表达式中的错误,并给出了正确形式。仿真结果证明了所提出方法的有效性。

For the phased array radar system at subarray level employing monopulse technique, it requires to suppress sidelobe of sum beam and different beam simultaneously. This paper investigates the approach which only applies one kind of analog weighting at element level combined with the digital weighting at subarray level to suppress sidelobe of sum and different beam. At first constructing sum channel and difference channel, then making optimum adaptive filtering for the supposed jammer within the whole sidelobe area of sum and difference beam, the desired analog weight is determined. In order to further improve sidelobe suppression effect, the digital weighting at subarray level is then adopted, which approximates to the conventional Taylor and Bayliss weight respectively. This approach reduces the hardware cost and complexity effectively, and makes full use of the flexibility of digital processing. Simulation results demonstrate the validity of the introduced approach.