Digital Beamforming on Receive in Elevation for Multidimensional Waveform Encoding SAR Sensing

Digital Beamforming on Receive in Elevation for Multidimensional Waveform Encoding SAR Sensing
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用于多维波形编码 SAR 感测的高程接收数字波束成形

DOI:
10.1109/lgrs.2014.2323267
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发表时间:
2014-06
影响因子:
4.8
通讯作者:
Liang Diannong
Liang Diannong
中科院分区:
工程技术2区
文献类型:
--
作者:
He Feng;Dong Zhen;Liang Diannong

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本文研究了一种采用仰角后检数字波束形成(DBF)的波形分离方法的性能,该方法用于多维波形编码SAR传感。定义了高程上的信噪比比例因子和全多普勒频带范围内的模糊信号比,对DBF方法进行了全局评估。研究了高程子孔径数选择的约束条件及其对图像质量的影响。通过理论分析和仿真,可以在数据量和成像性能之间进行权衡,选择合适的子孔径数。简要讨论了进一步的数据减少和性能优化策略。
This letter investigates the performance of a waveform-separation approach employing a posteriori digital beamforming (DBF) in elevation for multidimensional waveform encoding SAR sensing. The signal-to-noise ratio scaling factor in elevation and full-Doppler-band range ambiguity-to-signal ratio are defined to give global assessment of the DBF approach. Constraints for the selection of elevation subaperture number and their relevant influence on image quality are investigated. By theoretical analysis and simulation, the subaperture number can be appropriately selected by a tradeoff between the data volume and imaging performance. Further strategies for data reduction and performance optimization are briefly discussed.
DOI: 10.1109/lgrs.2014.2333232
发表时间: 2015-02
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