tailieunhanh - Báo cáo hóa học: " Physics-Based Predictions for Coherent Change Detection Using X-Band Synthetic Aperture Radar"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Physics-Based Predictions for Coherent Change Detection Using X-Band Synthetic Aperture Radar | EURASIP Journal on Applied Signal Processing 2005 20 3243-3258 2005 M. L. Williams and M. Preiss Physics-Based Predictions for Coherent Change Detection Using X-Band Synthetic Aperture Radar MarkL. Williams Imaging Radar Systems Group Intelligence Surveillance Reconnaissance Division Defence Science Technology Organisation . Box 1500 Edinburgh SA 5111 Australia Email Mark Preiss Imaging Radar Systems Group Intelligence Surveillance Reconnaissance Division Defence Science Technology Organisation . Box 1500 Edinburgh SA 5111 Australia Email Received 29 July 2004 Revised 9 December 2004 A theoretical model is developed to describe the interferometric coherency between pairs of SAR images of rough soil surfaces. The model is derived using a dyadic form for surface reflectivity in the Kirchhoff approximation. This permits the combination of Kirchhoff theory and spotlight synthetic aperture radar SAR image formation theory. The resulting model is used to describe the interferometric coherency between pairs of SAR images of rough soil surfaces. The theoretical model is applied to SAR images formed before and after surface changes observed by a repeat-pass SAR system. The change in surface associated with a tyre track following vehicle passage is modelled and SAR coherency estimates are obtained. Predicted coherency distributions for both the change and no-change scenarios are used to estimate receiver operator curves for the detection of the changes using a high-resolution X-band SAR system. Keywords and phrases synthetic aperture radar coherent change detection surface scattering. 1. INTRODUCTION Coherent change detection CCD using synthetic aperture radar SAR images from repeated apertures is an interferometric SAR technique and an increasingly important and rapidly developing area of research 1 2 3 . CCD techniques may be used to detect scene disturbances that occur between repeated SAR .