Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR

The development of high resolution SAR makes the influence of moving target more prominent, which results in defocusing and other unexplained phenomena. This paper focuses on the research of imaging signatures and velocity estimation of turning motion targets. In this paper, the turning motion is re...

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Main Authors: Xuejiao Wen, Xiaolan Qiu
Format: Article
Language:English
Published: MDPI AG 2020-04-01
Series:Sensors
Subjects:
Online Access:https://www.mdpi.com/1424-8220/20/8/2201
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author Xuejiao Wen
Xiaolan Qiu
author_facet Xuejiao Wen
Xiaolan Qiu
author_sort Xuejiao Wen
collection DOAJ
description The development of high resolution SAR makes the influence of moving target more prominent, which results in defocusing and other unexplained phenomena. This paper focuses on the research of imaging signatures and velocity estimation of turning motion targets. In this paper, the turning motion is regarded as the straight line motion of continuous change of moving direction. Through the analysis of the straight line motion with constant velocity and the geometric modeling of the turning motion in spaceborne SAR, the imaging signatures of the turning motion target are obtained, such as the broken line phenomenon at the curve. Furthermore, a method for estimating the turning velocity is proposed here. The radial velocity is calculated by the azimuth offset of the turning motion target and the azimuth velocity is calculated by the phase error compensated in the refocusing process. The amplitude and direction of the velocity can be obtained by using both of them. The results of simulation and GF-3 data prove the accuracy of the analysis of turning motion imaging signatures, and they also show the accuracy and validity of the velocity estimation method in this paper.
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spelling doaj.art-9234a8cfb2d44f9eae9623b2ba49cd802023-11-19T21:30:01ZengMDPI AGSensors1424-82202020-04-01208220110.3390/s20082201Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SARXuejiao Wen0Xiaolan Qiu1Laboratory of spatial information intelligent processing system, Institute of Electronics, Chinese Academy of Sciences, Suzhou 215000, ChinaInstitute of Electronics, Chinese Academy of Sciences, Beijing 100190, ChinaThe development of high resolution SAR makes the influence of moving target more prominent, which results in defocusing and other unexplained phenomena. This paper focuses on the research of imaging signatures and velocity estimation of turning motion targets. In this paper, the turning motion is regarded as the straight line motion of continuous change of moving direction. Through the analysis of the straight line motion with constant velocity and the geometric modeling of the turning motion in spaceborne SAR, the imaging signatures of the turning motion target are obtained, such as the broken line phenomenon at the curve. Furthermore, a method for estimating the turning velocity is proposed here. The radial velocity is calculated by the azimuth offset of the turning motion target and the azimuth velocity is calculated by the phase error compensated in the refocusing process. The amplitude and direction of the velocity can be obtained by using both of them. The results of simulation and GF-3 data prove the accuracy of the analysis of turning motion imaging signatures, and they also show the accuracy and validity of the velocity estimation method in this paper.https://www.mdpi.com/1424-8220/20/8/2201velocity estimationmoving targethigh resolution spaceborne SAR
spellingShingle Xuejiao Wen
Xiaolan Qiu
Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR
Sensors
velocity estimation
moving target
high resolution spaceborne SAR
title Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR
title_full Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR
title_fullStr Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR
title_full_unstemmed Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR
title_short Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR
title_sort research on turning motion targets and velocity estimation in high resolution spaceborne sar
topic velocity estimation
moving target
high resolution spaceborne SAR
url https://www.mdpi.com/1424-8220/20/8/2201
work_keys_str_mv AT xuejiaowen researchonturningmotiontargetsandvelocityestimationinhighresolutionspacebornesar
AT xiaolanqiu researchonturningmotiontargetsandvelocityestimationinhighresolutionspacebornesar