Spaceborne squinted multichannel synthetic aperture radar data focusing. Issue 9 (1st December 2014)

• Record Type: Journal Article
• Authors: Huang, Pingping; Xu, Wei; Li, Shengyang
• Is Part Of: IET radar, sonar & navigation. Volume 8:Issue 9(2014)
• Page Start: 1073
• Page End: 1080
• Publication Date: 2014-12-01
• Subjects: synthetic aperture radar -- radar imaging -- spaceborne radar -- radar cross‐sections -- Doppler radar -- image reconstruction -- image sampling -- target tracking -- radar tracking; spaceborne squinted multichannel SAR data focusing -- synthetic aperture radar -- echo analyses -- Doppler bandwidth -- squinted mode -- azimuth multichannel data reconstruction -- imaging approach -- azimuth multichannel data preprocessing -- Doppler spectrum aliasing -- azimuth subsampling -- modified range migration algorithm -- consequent equivalent monostatic spaceborne squinted SAR -- point target -- distributed target; Signal processing -- Periodicals; Radar -- Periodicals; Sonar -- Periodicals; Electronics in navigation -- Periodicals; Navigation -- Periodicals; 621.3848
• DOI: 10.1049/iet-rsn.2013.0332
• Languages: English
• ISSNs: 1751-8784

Abstract

Abstract : This study analyses echo properties of spaceborne squinted multichannel along the track synthetic aperture radar (SAR) data. The highly squint angle and the large transmitted pulse bandwidth lead to Doppler spectrum back folding in the spaceborne squinted case. The extended Doppler bandwidth in the squinted mode increases the processing difficulty of azimuth multichannel data reconstruction. According to echo properties of the spaceborne squinted mode, a new imaging approach for spaceborne squinted multichannel SAR data focusing is proposed. The key point of this imaging approach is azimuth multichannel data preprocessing to resolve the aliased Doppler spectrum caused by both azimuth sub‐sampling in each azimuth channel and the highly squint angle. Afterwards, a modified range migration algorithm is taken for consequent equivalent monostatic spaceborne squinted SAR data focusing. Simulation results on point targets and distributed target are given to validate the proposed imaging approach.