天基合成孔径雷达协同探测模型的研究

Research on the Spacebased SAR Cooperation Detection Model

提出了一种天基合成孔径雷达(Synthetic Aperture Radar,SAR)协同探测方法,利用星座中的多个SAR系统多视角、同时观测同一目标区,对获取的信息进行并行分布式检测,从而提升天基SAR系统的探测能力.研究了模糊信号的统计特性,考虑了杂波、系统噪声、后向散射状况等因素的影响,建立了独立天基SAR系统探测模型,得出了探测性能随对地观测角度变化的结论;基于分布式检测原理建立了天基SAR协同探测模型,确定了轨道参数、平台参数、SAR系统参数与探测性能之间的关系,为协同探测系统设计与实现奠定了基础.K/N准则下的对比分析结果表明,协同探测性能优于独立天基SAR系统探测性能.

A method is presented for improving the detection performance of the spacebased Synthetic Aperture Radar （SAR） system.in which the information is acquired by several SARs in a constellation observing the same area from different angles simultaneously, and then processed by the parallel distributed detection method. After studying the statistical characteristics of the ambiguity signal, with the impact of factors such as clutter, system noise and backscattering status considered, the individual spacebased SAR detection model is established, which shows that the detection performance depends on the observation angle. Based on the distributed detection theory, the Spacebased SAR Cooperation Detection （SSARCD） model is established, and the relationship between the detection performance and the parameters of the orbit, the platform and the SAR system is also determined, which bene- fits the design and realization of the cooperation detection system. Results from the contrast analysis prove that the detection performance of the SSARCD system is better than that of the individual spacebased SAR.