利用共轭对称性的数字IQ频域校准方法

doi:10.19665/j.issn1001-2400.2021.02.023

Abstract

Abstract:

To address the problem of IQ imbalance in the demodulation of radar intermediate frequency(IF) signals,this paper proposes a method for digital IQ calibration in the frequency domain based on conjugate symmetry.By modeling the IF signal at the presence of IQ imbalance,its spectral characteristic is first analyzed.The IF signal in the frequency domain can be decomposed into the unilaterally ideal signal and bilateral error signal.Among these,the bilateral error signal can be further decomposed into two components,the mirror-frequency error and the main-frequency error.Then,the relationship between the original spectrum of these two components and the spectrum of their conjugate counterparts is used to conduct some simple calculations for obtaining a frequency-domain estimate of the error signal.Therefore,the estimated error can be used to make the compensation in the IF signal.Experimental results from synthetic aperture radar imaging verify that the proposed method can effectively suppress both the mirror-frequency error and the main-frequency error from the IF signal and calibrate IQ imbalance to achieve the high performance of imaging.

Key words: IQ imbalance, radar signal processing, error calibration, synthetic aperture radar

CLC Number:

TN95

TAO Yi,DING Li. Method for digital IQ frequency-domain calibration based on conjugate symmetry[J].Journal of Xidian University, 2021, 48(2): 181-189.

Figures/Tables 8

参数名	含义	取值
V₁	含有误差的中频信号的主频分量值	V₂+V₄+V₅
V₂	理想中频信号的主频分量值	A exp(jθ)
V₃	双边总误差信号的主频分量值	V₄+V₅
V₄	实误差信号主频、镜频分量值或双边总误差信号的镜频分量值	0.5A $exp (- j θ) - α exp (- j (φ + θ))$
V₅	复误差信号的主频分量值	A $α cos (θ + φ) - cos θ$

References 16

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Method for digital IQ frequency-domain calibration based on conjugate symmetry

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