摘要
单脉冲技术通过比较单个脉冲多路回波信号的信息实现对目标角度位置的精确测量,广泛运用于跟踪雷达中。在雷达成像中引入单脉冲技术可以显著提高前视这一合成孔径雷达(SAR)与多普勒波束锐化(DBS)成像盲区雷达图像的清晰度。本文着重对单脉冲成像算法的成像效果分析方法进行研究。从单脉冲和差比的概率密度函数出发,提出了目标图像位置失真、分辨率以及图像信噪比3个对图像质量进行衡量的指标。分析了决定这3个指标的系统及外部环境参数,并给出了相应的计算方法。最终通过数值积分以及Monte-Carlo仿真实验对理论分析结果进行了验证。
Monopluse is a technique by which information concerning the angular location of a target is obtained by compari- son of signals received in multi-channels. By introducing monopulse into the procedure of radar imaging, the definition con- cerning the forward-looking area is significantly improved, which can hardly be achieved by syntheic aperture radar （SAR） or Doppler beam sharpening （DBS）. This paper concentrates on the method for evaluating the quality of images generated via the monopulse imaging algorithm. Based on the probability density function of the monopulse ratio, three criterions, i. e., the image position distortion, resolution and signal-to-noise ratio of the target to be imaged, are proposed. Parameters of the system and external environment determining the proposed criterions are analyzed, and the ways to calculate the crite- rions are provided. Simulation results obtained via numerical integration as well as Monte-Carlo method verify the presented theories
出处
《航空学报》
EI
CAS
CSCD
北大核心
2012年第10期1905-1914,共10页
Acta Aeronautica et Astronautica Sinica
基金
国防基础科研计划(B2520110008)
国家自然科学基金(61071165)
新世纪优秀人才支持计划(NCET-09-0069)
中国博士后科学基金(2012M511750)
中央高校基本科研业务费专项基金(NS2012097)~~
关键词
雷达成像
单脉冲
和差波束
分辨率
信噪比
radar imaging
monopulse
sum and difference beam
resolution
signal-to-noise ratio （SNR）
