Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration

It is difficult for multichannel maneuvering synthetic aperture radar (SAR) to achieve ground moving target 2D velocity estimation and refocusing. In this paper, a novel method based on back projection (BP) and velocity SAR (VSAR) is proposed to cope with the issues. First, the static scene is recon...

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Main Authors:	Xinxin Tang, Xiaoling Zhang, Jun Shi, Shunjun Wei, Bokun Tian
Format:	Article
Language:	English
Published:	MDPI AG 2019-08-01
Series:	Sensors
Subjects:	multichannel maneuvering synthetic aperture radar ground moving target 2D velocity estimation and refocusing back projection velocity SAR velocity-aided BP minimum entropy
Online Access:	https://www.mdpi.com/1424-8220/19/17/3695

id	doaj-1d2b28f2cc2142bebacf9eedcdd2c86b
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spelling	doaj-1d2b28f2cc2142bebacf9eedcdd2c86b2020-11-25T02:14:11ZengMDPI AGSensors1424-82202019-08-011917369510.3390/s19173695s19173695Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed AccelerationXinxin Tang0Xiaoling Zhang1Jun Shi2Shunjun Wei3Bokun Tian4School of Information and Communication Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu 611731, ChinaSchool of Information and Communication Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu 611731, ChinaSchool of Information and Communication Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu 611731, ChinaSchool of Information and Communication Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu 611731, ChinaSchool of Information and Communication Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Ave, West Hi-Tech Zone, Chengdu 611731, ChinaIt is difficult for multichannel maneuvering synthetic aperture radar (SAR) to achieve ground moving target 2D velocity estimation and refocusing. In this paper, a novel method based on back projection (BP) and velocity SAR (VSAR) is proposed to cope with the issues. First, the static scene is reconstructed by BP to solve the imaging problem of multichannel maneuvering SAR. Then, the static clutter is suppressed, and the range velocity is estimated via VSAR processing. As for azimuth velocity estimation and refocusing, a velocity search method based on velocity-aided BP (VA-BP) and VSAR is proposed to accomplish them. First, each azimuth velocity in the search and the estimated range velocity are used to image the moving target in a small-sized subimage space by VA-BP, i.e., matching the range history and the Doppler phase of the moving target in the image processing. Then, multiple sets of multichannel SAR subimages corresponding to different azimuth velocities are generated, and the clutter of each set of multichannel SAR subimages is also suppressed by VSAR processing. After that, the azimuth velocity is estimated by searching the clutter-suppressed subimage of the first spatial receiving channel in each set of multichannel SAR subimages with the best refocusing quality measured by the minimum entropy. Simulation results show the proposed method can reach high accuracy in moving target 2D velocity estimation and refocusing with the absolute error of 2D velocity estimation smaller than 0.1 m/s.https://www.mdpi.com/1424-8220/19/17/3695multichannel maneuvering synthetic aperture radarground moving target2D velocity estimation and refocusingback projectionvelocity SARvelocity-aided BPminimum entropy
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Xinxin Tang Xiaoling Zhang Jun Shi Shunjun Wei Bokun Tian
spellingShingle	Xinxin Tang Xiaoling Zhang Jun Shi Shunjun Wei Bokun Tian Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration Sensors multichannel maneuvering synthetic aperture radar ground moving target 2D velocity estimation and refocusing back projection velocity SAR velocity-aided BP minimum entropy
author_facet	Xinxin Tang Xiaoling Zhang Jun Shi Shunjun Wei Bokun Tian
author_sort	Xinxin Tang
title	Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration
title_short	Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration
title_full	Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration
title_fullStr	Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration
title_full_unstemmed	Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration
title_sort	ground moving target 2-d velocity estimation and refocusing for multichannel maneuvering sar with fixed acceleration
publisher	MDPI AG
series	Sensors
issn	1424-8220
publishDate	2019-08-01
description	It is difficult for multichannel maneuvering synthetic aperture radar (SAR) to achieve ground moving target 2D velocity estimation and refocusing. In this paper, a novel method based on back projection (BP) and velocity SAR (VSAR) is proposed to cope with the issues. First, the static scene is reconstructed by BP to solve the imaging problem of multichannel maneuvering SAR. Then, the static clutter is suppressed, and the range velocity is estimated via VSAR processing. As for azimuth velocity estimation and refocusing, a velocity search method based on velocity-aided BP (VA-BP) and VSAR is proposed to accomplish them. First, each azimuth velocity in the search and the estimated range velocity are used to image the moving target in a small-sized subimage space by VA-BP, i.e., matching the range history and the Doppler phase of the moving target in the image processing. Then, multiple sets of multichannel SAR subimages corresponding to different azimuth velocities are generated, and the clutter of each set of multichannel SAR subimages is also suppressed by VSAR processing. After that, the azimuth velocity is estimated by searching the clutter-suppressed subimage of the first spatial receiving channel in each set of multichannel SAR subimages with the best refocusing quality measured by the minimum entropy. Simulation results show the proposed method can reach high accuracy in moving target 2D velocity estimation and refocusing with the absolute error of 2D velocity estimation smaller than 0.1 m/s.
topic	multichannel maneuvering synthetic aperture radar ground moving target 2D velocity estimation and refocusing back projection velocity SAR velocity-aided BP minimum entropy
url	https://www.mdpi.com/1424-8220/19/17/3695
work_keys_str_mv	AT xinxintang groundmovingtarget2dvelocityestimationandrefocusingformultichannelmaneuveringsarwithfixedacceleration AT xiaolingzhang groundmovingtarget2dvelocityestimationandrefocusingformultichannelmaneuveringsarwithfixedacceleration AT junshi groundmovingtarget2dvelocityestimationandrefocusingformultichannelmaneuveringsarwithfixedacceleration AT shunjunwei groundmovingtarget2dvelocityestimationandrefocusingformultichannelmaneuveringsarwithfixedacceleration AT bokuntian groundmovingtarget2dvelocityestimationandrefocusingformultichannelmaneuveringsarwithfixedacceleration
_version_	1724901291384111104

Ground Moving Target 2-D Velocity Estimation and Refocusing for Multichannel Maneuvering SAR with Fixed Acceleration

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