2D spatial‐variant phase errors compensation for ISAR imagery based on contrast maximisation. Issue 17 (1st August 2016)

• Record Type: Journal Article
• Authors: Darong, Huang; Cunqian, Feng; Ningning, Tong; Yiduo, Guo
• Is Part Of: Electronics letters. Volume 52:Issue 17(2016)
• Page Start: 1480
• Page End: 1482
• Publication Date: 2016-08-01
• Subjects: radar imaging -- synthetic aperture radar -- gradient methods -- optimisation -- motion compensation -- error compensation -- convergence of numerical methods; 2D spatial‐variant phase errors compensation -- TSAR imagery -- contrast maximisation -- range spatial‐variant phase errors -- azimuth spatial‐variant phase errors -- high‐resolution inverse synthetic aperture radar imagery -- novel phase error parametrical signal model -- cost function -- iterative method -- modified gradient‐based method -- maximal contrast optimisation problem -- Naval Research Laboratory; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2016.1595
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Range and azimuth spatial‐variant phase errors are usually presented in high‐resolution inverse synthetic aperture radar imagery as the manoeuvring motion of the observed targets. It could not be effectively compensated by the traditional autofocus algorithms. A new method is proposed for 2D spatial‐variant phase errors compensation based on contrast maximisation. First, a novel phase error parametrical signal model is established. Then, image contrast is introduced as a cost function, and an iterative, modified gradient‐based method is used to solve a maximal contrast optimisation problem. The proposed method has a good convergence within a few iterations. The public data provided by the Naval Research Laboratory is utilised to confirm the effectiveness and superiorities of the proposed method.