外辐射源雷达中基于八单元均匀圆阵天线的测角方法

摘要

提出了一种适用于外辐射源雷达的比幅测角方法，利用八单元均匀圆阵天线结合方向图综合技术形成覆盖全空域的十八个波束，用以对目标进行扫描。首先进行波束扫描、杂波相消、距离多普勒处理，然后在距离多普勒平面上进行测角。对参考信号中含有目标回波的情况进行了分析，参考信号中含有目标回波时原始比幅测角方法的测角精度将受到较大的影响，针对该问题，提出了修正的测角方法，修正测角方法与原始方法相比在参考信号含有目标回波时能够更加精确地测量得到目标的方位角。%A direction of arrival (DOA)finding method in passive radar is proposed based on amplitude comparison of sig-nals between different beams.By the use of an 8-element uniform circular array,1 8 beams covering the whole space for targets surveillance are formed based on beam pattern synthesis technique.On the process of beam scanning,clutter cancellation and match filtering,DOA is estimated on the range-doppler map.Performance of the original method is analyzed when reference signal is con-taminated by target echoes,where the performance of the original method degrades rapidly.An improved method is proposed for the case when reference signal is contaminated by target echoes.Experiments show that the improved method well outperforms the origi-nal method when reference signal is contaminated by target echoes.