Phase bias estimation for multi‐channel HRWS SAR based on Doppler spectrum optimisation. Issue 21 (1st October 2016)

• Record Type: Journal Article
• Authors: Wang, Zhibin; Liu, Yanyang; Li, Zhenfang; Xu, Gang; Chen, Junli
• Is Part Of: Electronics letters. Volume 52:Issue 21(2016)
• Page Start: 1805
• Page End: 1807
• Publication Date: 2016-10-01
• Subjects: synthetic aperture radar -- array signal processing -- optimisation -- telecommunication channels; phase bias estimation -- multichannel HRWS SAR -- Doppler spectrum optimisation -- digital beam‐forming technique -- multichannel synthetic aperture radar system -- high‐resolution wide‐swath imaging -- sharpness optimisation -- air‐borne multichannel system -- SAR data; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2016.2972
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : By applying digital beam‐forming (DBF) technique, the along‐track multi‐channel synthetic aperture radar (SAR) system can simultaneously achieve high‐resolution and wide‐swath (HRWS) imaging. However, the presence of unavoidable phase biases tends to degrade the DBF performance. To address this issue, a novel phase bias estimation algorithm based on Doppler spectrum optimisation is proposed. By exploiting the fact that phase bias would cause Doppler spectrum broadened, the phase biases can be successfully estimated by maximising a sharpness optimisation of the Doppler spectrum. The effectiveness of the algorithm is validated by experimental result carried out on the SAR data collected by an air‐borne multi‐channel system.