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An estimation method for InSAR interferometric phase combined with image auto-coregistration 被引量:10
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作者 LI Hai LI Zhenfang LIAO Guisheng BAO Zheng 《Science in China(Series F)》 2006年第3期386-396,共11页
In this paper we propose a method to estimate the InSAR interferometric phase of the steep terrain based on the terrain model of local plane by using the joint subspace projection technique proposed in our previous pa... In this paper we propose a method to estimate the InSAR interferometric phase of the steep terrain based on the terrain model of local plane by using the joint subspace projection technique proposed in our previous paper. The method takes advantage of the coherence information of neighboring pixel pairs to auto-coregister the SAR images and employs the projection of the joint signal subspace onto the corresponding joint noise subspace to estimate the terrain interferometric phase. The method can auto-coregister the SAR images and reduce the interferometric phase noise simultaneously. Theoretical analysis and computer simulation results show that the method can provide accurate estimate of the interferometric phase (interferogram) of very steep terrain even if the coregistration error reaches one pixel. The effectiveness of the method is verified via simulated data and real data. 展开更多
关键词 synthetic aperture radar interferometry (InSAR) subspace projection single-baseline interferometric phase eigen-decomposition image coregistration local plane.
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An interferometric phase shift fiber Bragg grating sensing system with greatly reduced background phase noise 被引量:1
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作者 Lina Ma Yu Chen +3 位作者 Zhengliang Hu Jinxing Huang Jun Wang and Shiqing Li 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第9期10-15,共6页
We presented an interferometric phase shift fiber Bragg grating (FBG) sensor, which inherited the advantages of FBG sensors, and, at the same time, the greatly reduced full-width-at-half-maximum bandwidth brought lo... We presented an interferometric phase shift fiber Bragg grating (FBG) sensor, which inherited the advantages of FBG sensors, and, at the same time, the greatly reduced full-width-at-half-maximum bandwidth brought longer coherent length, higher sensitivity, and lower phase noise. Experiments show that at least a 7 dB reduction of phase noise can be achieved compared to FBG sensors interrogated by interferometer with the same optical path difference. 展开更多
关键词 FBG PS An interferometric phase shift fiber Bragg grating sensing system with greatly reduced background phase noise
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A Feasible Approach for Improving Accuracy of Ground Deformation Measured by D-InSAR 被引量:8
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作者 CHANG Zhan-qiang GONG Hui-li +1 位作者 ZHANG Jing-fa GONG Li-xia 《Journal of China University of Mining and Technology》 EI 2007年第2期262-266,共5页
D-InSAR is currently one of the most popular research tools in the field of Microwave Remote Sensing. It is unrivaled in its aspect of measuring ground deformation due to its advantages such as high resolution,continu... D-InSAR is currently one of the most popular research tools in the field of Microwave Remote Sensing. It is unrivaled in its aspect of measuring ground deformation due to its advantages such as high resolution,continuous spa-tial-coverage and dynamics. However,there are still a few major problems to be solved urgently as a result of the intrin-sic complexity of this technique. One of the problems deals with improving the accuracy of measured ground deforma-tion. In this paper,various factors affecting the accuracy of ground deformation measured by D-InSAR are systemati-cally analyzed and investigated by means of the law of measurement error propagation. At the same time,we prove that the ground deformation error not only depends on the errors of perpendicular baselines as well as the errors of the inter-ferometric phase for topographic pair and differential pair,but also on the combination of the relationship of perpen-dicular baselines for topographic pairs and differential pairs. Furthermore,a feasible approach for improving the accu-racy of measured ground deformation is proposed,which is of positive significance in the practical application of D-InSAR. 展开更多
关键词 D-INSAR ground deformation perpendicular baseline interferometric phase
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Effects of residual motion compensation errors on the performance of airborne along-track interferometric SAR 被引量:2
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作者 Hui ZHANG Jun HONG +3 位作者 Xiao-lan QIU Ji-chuan LI Fang-fang LI Feng MING 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2016年第10期1095-1105,共11页
Two approximations, center-beam approximation and reference digital elevation model (DEM) approximation, are used in synthetic aperture radar (SAR) motion compensation procedures. They usually introduce residual m... Two approximations, center-beam approximation and reference digital elevation model (DEM) approximation, are used in synthetic aperture radar (SAR) motion compensation procedures. They usually introduce residual motion compensation errors for airborne single-antenna SAR imaging and SAR interferometry. In this paper, we investigate the effects of residual uncompensated motion errors, which are caused by the above two approximations, on the performance of airborne along-track interferometric SAR (ATI-SAR). The residual uncompensated errors caused by center-beam approximation in the absence and in the presence of elevation errors are derived, respectively. Airborne simulation parameters are used to verify the correctness of the analysis and to show the impacts of residual uncompensated errors on the interferometric phase errors for ATI-SAR. It is shown that the interferometric phase errors caused by the center-beam approximation with an accurate DEM could be neglected, while the interferometric phase errors caused by the center-beam approximation with an inaccurate DEM cannot be neglected when the elevation errors exceed a threshold. This research provides theoretical bases for the error source analysis and signal processing of airborne ATI-SAR. 展开更多
关键词 Synthetic aperture radar (SAR) Along-track interferometric Motion compensation Residual error interferometric phase
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