海杂波谱的机理及时变特性分析

针对海杂波背景下目标检测问题的实际需求,在机理分析的基础上,利用实测数据对海杂波谱的时变特性进行了分析。首先,分析了波束照射区域内由海表面波浪运动引起的多普勒频移和展宽现象,以及随雷达工作参数之间的依赖关系;然后,对已有海杂波谱机理研究结果进行了分析和总结。在此基础上,利用加窗的周期图法估计得到海杂波的时间-多普勒谱,进而从相关时间的统计特性、谱宽与时域海杂波拖尾程度的依赖关系两个层面对海杂波谱的时变特性进行了分析。分析结果可为海杂波谱建模、海杂波抑制及目标检测方法设计提供理论指导。

Mechanism and Time-Varying Property Analysis of Sea Clutter Spectrum

According to the practical requirement of target detection problems in sea clutter background, the time-varyingproperty of sea clutter spectrum was analyzed using measured data based on the analysis results of the scattering mecha.nism. Firstly, the Doppler shift and spreading phenomena, which were caused by the motion of sea waves, were analyzed inthe illustrated area, as well as their dependence on radar working parameters. Then, the existing research results on themechanism of sea clutter were analyzed and summarized. Based on the mechanism analysis, the time-Doppler spectrum ofsea clutter was estimated via the tapering period gram method, and the time-varying property of sea clutter spectrum wasanalyzed in two aspects, including the statistical analysis of the correlation time, and the relationship between the spectralwidth and the tailed degree of time domain sea clutter. The above analysis results can provide theoretical guidance in areassuch as the modeling of sea clutter spectrum, the development of sea clutter suppression and target detection methods.