距离扩展目标回波序列的慢时间谱积累检测器  

A Slow Time Spectrum Integrate Detector for Range Spread Target Echo Sequence

作　　者：问翔[1] 刘宏伟[1] 包敏[2] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]西安电子科技大学电子工程学院,西安710071

出　　处：《西安交通大学学报》2013年第10期18-24,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(60901067;61001212;61201284);新世纪优秀人才支持计划资助项目(NCET-09-0630);长江学者和创新团队发展计划资助项目(IRT0954)

摘　　要：针对目标高速运动引起宽带雷达回波间包络平移使得距离扩展目标的检测率降低的问题,提出了一种距离扩展目标回波序列的慢时间谱积累(STSI)检测器。采用频率-慢时间模型描述距离扩展目标信号,将宽带雷达回波脉压后变换到距离频率域,然后对回波序列各频率单元沿着慢时间作傅里叶变换,最后将各频率向量的最大值累加与检测门限比较进行检测判决。STSI检测器不需要目标运动的先验信息,具有恒虚警检测性能,对目标运动引起的散射点跨距离单元走动不敏感。仿真试验表明,与不依赖散射点分布信息的广义似然比检测器相比,STSI检测器在检测率90%处有5dB的性能改善。A detector of slow time spectrum integrate （STSI） is proposed to solve the detect rate reducing problem of range spread target that is caused by the envelope migration among wideband radar echo sequences when targets are moving at high speed.A frequency-slow time dimension model is used to describe the range spread target signal,and the wideband radar echo is transformed to a range-frequency domain after pulse compression.Then the Fourier transformation is performed for each range-frequency cell,and the sum of each spectrum vector＇s maximum value is compared with detect threshold for detect judgment.The STSI detector does not require any pre-information of target motion,possesses constant false alarm rate performance,and is not sensitive to the migration through resolution cell caused by target motion.Simulation results and comparison with the non-scatterer density dependent generalized likelihood ratio test detector show that the STSI detector achieves 5 dB performance improvement at 90％ detect rate.

关 键 词：宽带雷达 距离扩展目标 雷达目标检测 频率-慢时间 

分 类 号：TP958.52[自动化与计算机技术]