Pub Date : 2013-01-01DOI: 10.3724/sp.j.1300.2013.13016
Wang Xiaoqing, Su Hai-qing, Chong Jin-song
Dynamic features are important aspects of the ocean. However the dynamic information is lost in most conventional Synthetic Aperture Radar (SAR) image processing methods, because they treat the image as an instantaneous state of the observed area. In fact, we can obtain dynamic features of the ocean from sequential sub-aperture images, because we know that the different parts of the azimuthal aperture correspond to different imaging instances. A key step for retrieving the dynamic features from sequential images is image-matching. However, the heavy noise characteristic of sub-aperture SAR images renders the traditional image-matching methods ineffective. In this paper we propose an image matching method based on improved phase correlation to deal with the heavy noise problem of SAR sub-aperture images. Experimental results show that the improved image-matching method presents an accuracy of 0.15 pixel and noise robustness. The analysis indicates that the improved algorithm is competent for obtaining dynamic information from the medium resolution airborne SAR images or high resolution spaceborne SAR images with 0.15-0.3 m/s estimation precision under most SNR conditions. The improved algorithm was used on an airborne SAR data to retrieve the movement velocity. The retrieved velocity ranged from 0.05-0.5 m/s, which seems to be reasonable value for the ocean current velocity.
{"title":"An Improved Phase Correlation Method for Obtaining Dynamic Feature of the Ocean from Sequential SAR Sub-aperture Images","authors":"Wang Xiaoqing, Su Hai-qing, Chong Jin-song","doi":"10.3724/sp.j.1300.2013.13016","DOIUrl":"https://doi.org/10.3724/sp.j.1300.2013.13016","url":null,"abstract":"Dynamic features are important aspects of the ocean. However the dynamic information is lost in most conventional Synthetic Aperture Radar (SAR) image processing methods, because they treat the image as an instantaneous state of the observed area. In fact, we can obtain dynamic features of the ocean from sequential sub-aperture images, because we know that the different parts of the azimuthal aperture correspond to different imaging instances. A key step for retrieving the dynamic features from sequential images is image-matching. However, the heavy noise characteristic of sub-aperture SAR images renders the traditional image-matching methods ineffective. In this paper we propose an image matching method based on improved phase correlation to deal with the heavy noise problem of SAR sub-aperture images. Experimental results show that the improved image-matching method presents an accuracy of 0.15 pixel and noise robustness. The analysis indicates that the improved algorithm is competent for obtaining dynamic information from the medium resolution airborne SAR images or high resolution spaceborne SAR images with 0.15-0.3 m/s estimation precision under most SNR conditions. The improved algorithm was used on an airborne SAR data to retrieve the movement velocity. The retrieved velocity ranged from 0.05-0.5 m/s, which seems to be reasonable value for the ocean current velocity.","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70073697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/sp.j.1300.2013.13023
Chen Zeng-ping, Zhang Wei-cheng, Lin Qian-qiang
This paper is proposed to eliminate the negative influence of the Rotational Phase Component (RPC) on the performance of the Doppler Centroid Tracking (DCT) phase compensation method. Firstly, the coherent property between adjacent echo pulses sampled directly in Intermediate Frequency (IF) is analyzed in the paper. Then a coherent phase compensation method is developed to improve the Translational Phase Component (TPC) estimation accuracy of DCT. Compared to the Modified DCT (MDCT) algorithm, the proposed method achieves better phase compensation performance. Experimental results prove the effectiveness and efficiency of the proposed strategy.
{"title":"A Novel Phase Compensation Method for ISAR Imaging in Wideband Radar","authors":"Chen Zeng-ping, Zhang Wei-cheng, Lin Qian-qiang","doi":"10.3724/sp.j.1300.2013.13023","DOIUrl":"https://doi.org/10.3724/sp.j.1300.2013.13023","url":null,"abstract":"This paper is proposed to eliminate the negative influence of the Rotational Phase Component (RPC) on the performance of the Doppler Centroid Tracking (DCT) phase compensation method. Firstly, the coherent property between adjacent echo pulses sampled directly in Intermediate Frequency (IF) is analyzed in the paper. Then a coherent phase compensation method is developed to improve the Translational Phase Component (TPC) estimation accuracy of DCT. Compared to the Modified DCT (MDCT) algorithm, the proposed method achieves better phase compensation performance. Experimental results prove the effectiveness and efficiency of the proposed strategy.","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70074451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/sp.j.1300.2013.13073
Guan Xin, Zhong Li-hua, Huang Donghui, D. Chibiao
For passive radar, a long integration time is used to achieve high processing gain in order to detect a weak target. As a result, range migration and Doppler expansion may occur for high-speed targets. A keystone transform can be used to rectify range migration introduced by radial velocity. Tangential velocity, however, may lead to Doppler expansion, which entails a loss of integration gain. In this paper, a signal model is presented to analyze the reason for Doppler expansion. A Doppler expansion compensation method is then introduced based on a RSPWVD-Hough transform for a multiple-target scenario. Simulation results show that the proposed method can compensate, with good performance, for the energy loss caused by Doppler expansion in a multiple-target scene. Additionally, results show that the proposed method is also effective for weak targets, and may therefore improve
{"title":"A Compensation Algorithm Based on a RSPWVD-Hough Transform for Doppler Expansion in Passive Radar","authors":"Guan Xin, Zhong Li-hua, Huang Donghui, D. Chibiao","doi":"10.3724/sp.j.1300.2013.13073","DOIUrl":"https://doi.org/10.3724/sp.j.1300.2013.13073","url":null,"abstract":"For passive radar, a long integration time is used to achieve high processing gain in order to detect a weak target. As a result, range migration and Doppler expansion may occur for high-speed targets. A keystone transform can be used to rectify range migration introduced by radial velocity. Tangential velocity, however, may lead to Doppler expansion, which entails a loss of integration gain. In this paper, a signal model is presented to analyze the reason for Doppler expansion. A Doppler expansion compensation method is then introduced based on a RSPWVD-Hough transform for a multiple-target scenario. Simulation results show that the proposed method can compensate, with good performance, for the energy loss caused by Doppler expansion in a multiple-target scene. Additionally, results show that the proposed method is also effective for weak targets, and may therefore improve","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70074490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.3724/SP.J.1300.2012.20028
Huang Chongpeng, Wang Jian, Xue Baoguo
Sidelobe Suppression (SS) can be found on almost every Linear Frequency Modulated (LFM) pulse radar receiver; Shift-Frequency Jamming (SFJ) is an important method to realize deception jamming using the inherent coupling property between time-delay and frequency-shift of this LFM signal. So, the Inter-Ambiguity Function (IAF) of LFM with SS using normalized parameters including time-delay rate and shift-frequency rate is analyzed. Then the 3:1 cone than weighted, Hamming weighted and cosine square weighted are focused and some parameters related to detection are analyzed. Compared with the none SS, the weighted shift-frequency signal to Jamming loss and the weighted shift-frequency jamming to noise loss are present like M function having the max shift-frequency rate point equal to ± 0.29. And the impact of weighted shift-frequency pulse-width loss are decide by none
{"title":"The Impact of Sidelobe Suppression in Shift-frequency Jamming against LFM","authors":"Huang Chongpeng, Wang Jian, Xue Baoguo","doi":"10.3724/SP.J.1300.2012.20028","DOIUrl":"https://doi.org/10.3724/SP.J.1300.2012.20028","url":null,"abstract":"Sidelobe Suppression (SS) can be found on almost every Linear Frequency Modulated (LFM) pulse radar receiver; Shift-Frequency Jamming (SFJ) is an important method to realize deception jamming using the inherent coupling property between time-delay and frequency-shift of this LFM signal. So, the Inter-Ambiguity Function (IAF) of LFM with SS using normalized parameters including time-delay rate and shift-frequency rate is analyzed. Then the 3:1 cone than weighted, Hamming weighted and cosine square weighted are focused and some parameters related to detection are analyzed. Compared with the none SS, the weighted shift-frequency signal to Jamming loss and the weighted shift-frequency jamming to noise loss are present like M function having the max shift-frequency rate point equal to ± 0.29. And the impact of weighted shift-frequency pulse-width loss are decide by none","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":"270-276"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70072974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.3724/SP.J.1300.2012.20054
Qianqiang Lin, P. Tang, Zengping Chen
{"title":"Design and Implementation of Direct IF Sampling and High-speed Storage System for Wideband Radar: Design and Implementation of Direct IF Sampling and High-speed Storage System for Wideband Radar","authors":"Qianqiang Lin, P. Tang, Zengping Chen","doi":"10.3724/SP.J.1300.2012.20054","DOIUrl":"https://doi.org/10.3724/SP.J.1300.2012.20054","url":null,"abstract":"","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":"283-291"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70072707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.3724/SP.J.1300.2012.20062
Lin Chen, Jingjing Zhang, Yang Li, W. Hong
{"title":"General Calibration Algorithm for Single-transmitting-dual-receiving Polarimetric SAR System: General Calibration Algorithm for Single-transmitting-dual-receiving Polarimetric SAR System","authors":"Lin Chen, Jingjing Zhang, Yang Li, W. Hong","doi":"10.3724/SP.J.1300.2012.20062","DOIUrl":"https://doi.org/10.3724/SP.J.1300.2012.20062","url":null,"abstract":"","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":"323-328"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70072962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.3724/SP.J.1300.2012.20030
Gao-sheng Li, Lei Jia, Y. Ming, Q. Cao
{"title":"Study of Power Coefficient and Insertion Phase Shift for Organic Magnetic Slab: Study of Power Coefficient and Insertion Phase Shift for Organic Magnetic Slab","authors":"Gao-sheng Li, Lei Jia, Y. Ming, Q. Cao","doi":"10.3724/SP.J.1300.2012.20030","DOIUrl":"https://doi.org/10.3724/SP.J.1300.2012.20030","url":null,"abstract":"","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":"277-282"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70072519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Pixel-similarity Measurement in SAR Image Despeckling: The Pixel-similarity Measurement in SAR Image Despeckling","authors":"Guang-Ting Li, Liang Yang, Pingping Huang, Wei-dong Yu","doi":"10.3724/SP.J.1300.2012.20025","DOIUrl":"https://doi.org/10.3724/SP.J.1300.2012.20025","url":null,"abstract":"","PeriodicalId":37701,"journal":{"name":"Journal of Radars","volume":"1 1","pages":"301-308"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70072328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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