基于多普勒谱优化的HRWS SAR系统通道相位偏差估计算法

doi:10.11999/JEIT161038

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Abstract

By suppressing the Doppler ambiguity, the along-track multi-channel Synthetic Aperture Radar (SAR) system can simultaneously achieve High-Resolution and Wide-Swath (HRWS) imaging. However, the presence of unavoidable amplitude and phase bias tends to the absence of ambiguous signals in the SAR images. To address this issue, a novel phase bias estimation algorithm based on Doppler spectrum optimization is proposed. By exploiting the fact that phase bias can cause Doppler spectrum broadened, the phase bias can be successfully estimated by optimizing the Doppler spectrum. The Doppler centroid estimation can be avoided before phase biases estimation, which reduces the estimation accuracy caused by the inaccurate Doppler centroid. The proposed algorithm can achieve better performance when Signal to Noise Ratio (SNR) is low. The effectiveness of the algorithm is validated by experimental results carried out on simulated data and SAR data collected by an air- borne multi-channel system.

Key words： Synthetic Aperture Radar (SAR) High-Resolution and Wide-Swath (HRWS) Multi-channel Digital Beam-Forming (DBF) Phase bias estimation Doppler spectrum optimization

Received: 08 October 2016 Published: 14 December 2016

PACS:

TN957.51

Fund:

The National Natural Science Foundation of China (61471276, 61601298, 61671355)

Corresponding Authors: LI Zhenfang E-mail: lzf@xidian.edu.cn

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	WANG Zhibin
	LIU Yanyang
	LI Zhenfang
	CHEN Junli

Cite this article:

WANG Zhibin,LIU Yanyang,LI Zhenfang等. Phase Bias Estimation Algorithm for HRWS SAR System in Azimuth Based on Doppler Spectrum Optimization[J]. JEIT, 2016, 38(12): 3026-3033.

URL:

http://jeit.ie.ac.cn/EN/10.11999/JEIT161038 OR http://jeit.ie.ac.cn/EN/Y2016/V38/I12/3026

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