New method for airborne SAR image positioning. Issue 19 (5th July 2019)

• Record Type: Journal Article
• Authors: Wang, Ding; Liu, Aifang; Xia, Xue
• Is Part Of: Journal of engineering. Volume 2019:Issue 19(2019)
• Page Start: 6021
• Page End: 6023
• Publication Date: 2019-07-05
• Subjects: radar imaging -- synthetic aperture radar -- airborne radar -- digital elevation models; positioning accuracy -- polynomial model -- airborne SAR image positioning -- synthetic aperture radar geometric positioning -- geodetic coordinates -- position -- attitude angle -- influence factors -- image deformation -- great practical significance -- precise geometric positioning method -- positioning method combining range‐Doppler model -- SAR image accurate positioning -- digital elevation model data -- terrain‐height‐induced geometric distortions -- practical positioning model; Engineering -- Periodicals; Engineering; Electronic journals; Periodicals; 620.005
• DOI: 10.1049/joe.2019.0417
• Languages: English
• ISSNs: 2051-3305

Abstract

Abstract : Synthetic aperture radar (SAR) geometric positioning obtains the geodetic coordinates of each pixel in a SAR image. However, due to the changes in geometry, position and attitude angle of the sensor and the influence factors such as topography, atmospheric refraction, plus the curvature and rotation of the earth, image deformation will occur. Therefore, there is a great practical significance to explore the precise geometric positioning method for SAR images. It proposed a new positioning method combining range‐Doppler model and polynomial model, realising SAR image accurate positioning with the digital elevation model data. The method considers the effects of terrain‐height‐induced geometric distortions and establishes a practical positioning model based on the geometric relationship of imaging. The result shows that the positioning accuracy of the proposed method is higher than the accuracy of the traditional rang‐Doppler model and polynomial model with a small number of ground control points.