The direction-of-arrival (DOA) estimation for target and decoy under the towed radar decoy jamming is the precondition to achieve correct selection of target. The fact that target and decoy both exist within radar beam causes the merging of the radar echoes aliasing and measurement, and leads the regular processing of observation extraction and parameter measurement to fail. Through utilizing the information about the unknown parameter embodying in the novariance matrix of conditional probability distribution of the sum/diff channel echoes, the explicit solution for the DOA estimation of target and decoy was obtained. In order to satisfy the need of relative power ratio (RPR) in the estimation processing, the twice joint estimation algorithm for DOA based on circular estimation of RPR utilizing the information about jamming detection, radar measuring and target tracking was proposed. Simulation results with different conditions proved the performance effectiveness of the proposed method.%拖曳式诱饵干扰下目标和诱饵DOA参数的准确估计是导引头实现目标分选的前提条件.波束内目标和诱饵的存在引起雷达回波混叠和观测耦合,导致常规观测提取与参数测量方法失效.通过挖掘雷达接收回波和、差通道信号条件概率分布协方差所包含的未知参数信息,获得了目标和诱饵DOA估计的解析表达式,针对估计求解中所需相对功率比未知的情况,提出了基于干扰检测、雷达测量与目标跟踪信息辅助循环估计相对功率比的DOA二次联合估计方法.不同干扰条件的仿真实验验证了估计方法的有效性.
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