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