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星载MIMO-SAR与距离向DBF相结合系统研究 被引量:11

Study of the System Combining Spaceborne MIMO-SAR and Elevation DBF
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摘要 将星载MIMO-SAR系统与距离向数字波束形成技术相结合,设计了DBF-MIMO-SAR系统,能够解决星载MIMO-SAR系统距离模糊较大的问题.该系统方位向各孔径不是同时发射信号,而是按照一定的时间顺序,顺序发射.接收回波时,各孔径同时接收,在距离向使用DBF技术,分离回波信号和抑制距离模糊.同时分析了DBF-MIMO-SAR系统主要系统参数,包括脉冲重复频率、孔径间发射脉冲延时、雷达方程、数据率.仿真结果表明,该系统能有效地实现高分辨率宽测绘带模式,减小距离模糊和方位模糊. The paper studies spaceborne digital beamforming(DBF) MIMO-SAR system by combining spaceborne MIMO-SAR and elevation DBF in order to reduce the larger range ambiguity in the spaceborne MIMO-SAR system.While transmitting orthogonal code waveforms,multiple sub-apertures don't transmit simultaneously,but do that with certain sequence.While receiving echoes,multiple sub-apertures receive return simultaneously.Elevation receive DBF is used to separated echoes and reduce range ambiguity.Moreover,the primary system parameters,including PRF,delay between sub-aperture,radar equation and data rate,are analyzed.Simulation results confirm that DBF-MIMO-SAR is efficient to realize high resolution and wide swath.
出处 《电子学报》 EI CAS CSCD 北大核心 2010年第10期2251-2257,共7页 Acta Electronica Sinica
关键词 星载合成孔径雷达 多发多收 数字波束形成 高分辨率宽测绘带 距离模糊 spaceborne synthetic aperture radar(SAR) multiple input multiple output(MIMO) digital beamforming(DBF) high resolution wide swath(HRWS) range ambiguity
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参考文献14

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