Echo Separation in Multidimensional Waveform Encoding SAR Remote Sensing Using an Advanced Null-Steering Beamformer
Echo Separation in Multidimensional Waveform Encoding SAR Remote Sensing Using an Advanced Null-Steering Beamformer
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DOI：
10.1109/tgrs.2012.2187905
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发表时间：
2012-04
影响因子：
8.2
通讯作者：
Fan Feng;Shiqiang Li;Weidong Yu;Pingping Huang;W. Xu
中科院分区：
文献类型：
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作者：
Fan Feng;Shiqiang Li;Weidong Yu;Pingping Huang;W. Xu
为了充分利用波形分集技术为星载合成孔径雷达遥感提供的潜在优势，首先需要对构成完整发射波形的不同子脉冲回波进行有效分离。本文提出了一种利用卫星上先进的零指向波束形成器实现分离的新方法。与普通的零指向波束形成方法相比，该方法考虑了现场回波信号的特性，并将有限脉冲响应（FIR）滤波过程嵌入到改进的零指向波束形成器中，以解决脉冲扩展问题。本文将详细分析由多维编码波形产生的回波信号；在此基础上，推导了FIR滤波器和新型零导向波束形成器。仿真结果表明，该方法比传统的零方向波束形成方法具有更好的分离性能。
In order to reap the potential benefits that waveform diversity can provide for spaceborne synthetic aperture radar remote sensing, echoes from different subpulses constituting a complete transmit waveform should be effectively separated at first. This paper presents a new separation approach implemented by an advanced null-steering beamformer on satellite. Compared with common null-steering beamforming, our approach will take into account the characteristics of echo signal from the scene and accordingly embed the finite-impulse response (FIR) filtering process into the modified null-steering beamformer to deal with the issue of pulse extension. In this paper, echo signals generated by multidimensional encoded waveform will be analyzed in detail; based on this analysis, FIR filter and the new null-steering beamformer are derived. Simulation results show that much better separation performance can be obtained by our approach than by conventional null-steering beamforming.