Accurate DC offset calibration of Doppler radar via non-convex optimisation

Author

Heng Zhao ; Hong Hong ; Li Sun ; Feng Xi ; Changzhi Li ; Xiaohua Zhu

Author_Institution

Sch. of Electron. & Opt. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China

Volume

51

Issue

16

fYear

2015

fDate

8 6 2015

Firstpage

1282

Lastpage

1284

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.

Keywords

CW radar; Doppler radar; calibration; concave programming; iterative methods; medical signal detection; medical signal processing; patient monitoring; radar detection; IRL1 algorithm-based error correction method; accurate DC offset calibration; continuous wave Doppler radar; iteratively reweighed ℓ₁ algorithm-based error correction method; measurement outlier sparsity; noncontact vital sign detection; nonconvex optimisation; quadrature homotype architecture;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2015.1181

Filename

7175179