摘要
为解决单脉冲体制下两个慢起伏不可分辨舰船目标的方位角估计问题,提出一种基于角度有界约束和可调节滑动窗口的角估计算法。针对雷达散射截面(RCS)起伏服从对数正态分布的两个舰船目标,给出了其单脉冲响应,分析了单脉冲比的实部特性,结合此特性和噪声影响分析了单脉冲角估计均值算法估计性能不稳定和出现误差的不足。以半功率波束宽度为有界约束筛选回波信息,改进了单脉冲角估计均值算法中的滑动窗口模型;基于筛选的回波信息,利用含有改进滑动窗口模型的单脉冲角估计均值算法来估计两舰船目标的方位角。仿真结果表明该算法估计性能稳定,且在相同仿真条件下估计精度整体上优于已有算法,验证了算法的有效性。
To make azimuth estimation to two slow-fluctuation unresolved ship targets with monopulse radar, an angle estimation algorithm based on angle bound constraint and adjustable sliding window was proposed. In the case that the ships＇ Radar Cross Section （RCS） fluctuation obeys lognormal distribution, the monopulse responses of the two ship targets was discussed, combined with the characteristics of the real part of monopulse ratio and effect of noise. The deficiencies of unstable estimation performance and existing error of the monopulse angle estimation mean algorithm were analyzed. The target echo was selected by bound constraint of half-power beamwidth, the sliding window of the monopulse angle estimation mean algorithm was improved. Based on the selected target echo, the monopulse angle estimation mean algorithm containing the improved sliding window was used to estimate the target azimuth. Simulation results show that the proposed algorithm has stable estimation performance, and has better estimation performance than the previous estimation algorithm under the same simulation conditions, which verify the validity of the algorithm.
出处
《电光与控制》
北大核心
2016年第2期21-25,共5页
Electronics Optics & Control
基金
国家自然科学基金(61471379)
"泰山学者"建设工程专项经费资助课题
关键词
单脉冲雷达
不可分辨舰船目标
角估计
单脉冲比
有界约束
monopulse radar
unresolved ship target
angle estimation
monopulse ratio
bound constraint
