Precise Calibration of Channel Imbalance for Very High Resolution SAR With Stepped Frequency

被引：21

作者：

Wang, Xiangyu ^{[1
,2
]}

Wang, Robert ^{[1
]}

Deng, Yunkai ^{[1
]}

Wang, Pei ^{[1
]}

Li, Ning ^{[1
]}

Yu, Weidong ^{[1
]}

Wang, Wei ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Elect, Dept Space Microwave Remote Sensing Syst, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

来源：

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2017年 / 55卷 / 08期

关键词：

Calibration loops; channel imbalance; cost function; radar data processing; stepped frequency waveforms; synthetic aperture radar (SAR); BANDWIDTH;

D O I：

10.1109/TGRS.2017.2688728

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Synthetic aperture radar (SAR) images require a high-resolution system for accurate interpretations. This high range resolution can be achieved by stepped frequency chirp signals. To reconstruct a wideband waveform from each subband signal, amplitude/phase/delay imbalance between the channels should be precisely compensated. In this paper, the system configuration is first presented. Further, a calibration strategy was proposed based on three calibration loops: the reference calibration, transmitting calibration, and receiving calibration loops for coarsely compensating the channel imbalance. Then, two different methods based on the cost functions were proposed to remove the residual channel imbalance. The proposed methods were validated using stepped frequency SAR data acquired by an X-band airborne SAR system with a total bandwidth of 3.6 GHz, yielding (unweighted) a 3-dB range resolution of 4 cm.

引用

页码：4252 / 4261

页数：10

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