Accurate DC offset calibration of Doppler radar via non‐convex optimisation. Issue 16 (1st August 2015)

• Record Type: Journal Article
• Authors: Zhao, Heng; Hong, Hong; Sun, Li; Xi, Feng; Li, Changzhi; Zhu, Xiaohua
• Is Part Of: Electronics letters. Volume 51:Issue 16(2015)
• Page Start: 1282
• Page End: 1284
• Publication Date: 2015-08-01
• Subjects: CW radar -- Doppler radar -- concave programming -- iterative methods -- medical signal detection -- patient monitoring -- radar detection -- medical signal processing -- calibration; IRL1 algorithm‐based error correction method -- iteratively reweighed ℓ1 algorithm‐based error correction method -- measurement outlier sparsity -- quadrature homotype architecture -- noncontact vital sign detection -- continuous wave Doppler radar -- nonconvex optimisation -- accurate DC offset calibration; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2015.1181
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : Continuous‐wave Doppler radar has attracted a lot of attention for non‐contact vital sign detection. In the typical quadrature homotype architecture, the DC offset is a tough issue in that it seriously deteriorates the demodulated results. However, existing methods for DC offset calibration can hardly obtain accurate compensation, especially when the sparsity of measurement outliers is relatively large. Proposed is a novel iteratively reweighed ℓ1 algorithm‐based error correction method. Simulated and experimental results demonstrate the advantages of the method for accurate DC offset calibration.