子阵级单脉冲四通道主瓣干扰对消角度分辨率分析

Angular resolution analysis of four-channel mainlobe interferencecancellation for monopulse at subarray level

针对子阵级单脉冲雷达,研究了和差四通道主瓣干扰对消技术。为此,构建了二维子阵级单脉冲四通道干扰对消信号模型,并提出了以有用信号信噪比损失值为指标的定量方法来表征主瓣干扰对消角度分辨率。基于此,进一步推导了干扰对消角度分辨率的解析表达式,并明确了对消角度盲区的理论边界。仿真与暗室实验的结果验证了该解析式的正确性。研究可为四通道主瓣干扰对消技术的理论边界分析和工程实现提供参考。

The sum-difference four-channel mainlobe interference cancellation technique for monopulse radar at subarray level was studied.To this end,the signal model of four-channel interference cancellation at two-dimensional subarray level for monopulse radar was established,and a quantitative method using the signal-to-noise ratio loss of the useful signal as an indicator to characterize the angular resolution of mainlobe interference cancellation was proposed.Based on this,an analytical expression for the angular resolution of interference cancellation was further derived,and the theoretical boundary of the cancellation angle blind zone was clarified.The correctness of the analytical formula is verified by simulation and anechoic chamber experiment results.This research can provide a reference for the theoretical boundary analysis and engineering implementation of four-channel mainlobe interference cancellation technology.