混合背景下雷达导引头检测性能分析

Detection performance analysis for the radar seeker in mixed background

以低空雷达导引头目标检测为背景,综合分析了杂波与热噪声对雷达导引头目标检测性能的影响效果.假定雷达导引头检测阶段依次采用匹配滤波、平方律检波、非相参积累、单元平均恒虚警率检测以及双门限检测,理论推导得到了K分布杂波与瑞利分布热噪声环境下雷达导引头虚警概率和检测概率数学表达式.在此基础上,仿真给出了多种场景下的雷达导引头检测性能,分析了杂波与热噪声对雷达检测性能的综合影响效果.分析结果表明:杂波形状参数越小、杂噪比越大,雷达导引头检测概率越低;雷达导引头检测概率下降速度随着杂波形状参数和杂噪比的减小逐渐加快;检测概率一定时,雷达导引头检测不同起伏类型目标所需的信杂噪比差异受混合背景起伏度的影响较小.

On the background of target detection for the low altitude radar seeker,influence of the clutter plus thermal noise on the detection performance of the radar seeker is analyzed in this paper.With the assumption that matched filtering,square-law detection, noncoherent integration,cell averaging constant false alarm rate detection and doublethreshold detection are employed sequentially for radar seeker detection,mathematical expressions of radar seeker detection and false alarm probabilities in K distributed clutter plus Rayleigh distributed thermal noise environment are obtained by theoretical derivation.Based on this,detection performances of the radar seeker in various circumstances are given by simulations,and comprehensive effect of the clutter plus thermal noise on the detection performance of the radarseeker is analyzed.Analysis results show that radar seeker detection probability decreases as clutter shape parameter decreases and clutter-to-noise ratio increases.Decreasing velocity of the detection probability increases as the clutter shape parameter and clutter-to-noise ratio decrease.With fixed detection probability,the differences of the needed signal-to-clutter plus noise ratio for different fluctuating targets are influenced just a little by the fluctuation degree of the mixed background.