Waveform Diversity Extraction in Spaceborne MIMO-SAR System Based on Multidimensional Waveform Encoding
Waveform Diversity Extraction in Spaceborne MIMO-SAR System Based on Multidimensional Waveform Encoding
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发表时间：
2012
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通讯作者：
Xu Wei
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作者：
Xu Wei
星载多输入多输出SAR与传统的星载SAR系统相比，多维波形编码的MIMO-SAR系统可以获得更宽的无模糊测绘带宽度和更高的方位向分辨率，基于传统数字波束形成（DBF）技术的波形分集提取方法数据量大，而新近提出的接收时扫描（SCORE）技术接收天线增益受地形影响较大，本文提出了一种基于子阵天线的SCORE技术和后验空时处理（STP）相结合的波形分集提取方法，该方法可以有效地降低SCORE技术中接收天线的增益损失和系统的高数据率，这种方法仍然保留了一些有用的信息，仿真结果表明，该方法优于传统的波形分集方法基于SCORE技术的提取方法。
Spaceborne multi-input multi-output SAR(MIMO-SAR) system combined with multidimensional waveform encoding can obtain wider unambiguous swath width and higher azimuth resolution than traditional spaceborne SAR system.However,the mount of data of waveform diversity extraction method based on traditional digital beam-forming(DBF) techniques is seriously high and the great receive antenna gain loss from topography occurs with the recent presented scan-on-receive(SCORE) technique.A new waveform diversity extraction approach taking advantages of the SCORE technique via sub-array antennas and posterior space time processing(STP) is proposed in this paper.This approach can reduce the high date rate of SAR systems and the receiveing antenna gain loss from topography in the SCORE technique.Furthermore,this approach remains some useful information of multi-channel in elevation for other applications and it is easy to be realized.Simulation results validate the presented approach is better than the waveform diversity extraction method based on the SCORE technique.