An image interference suppression method for zero-IF architecture navigation


	receivers

Abstract

Abstract:

To address the image interference issue in zero intermediate frequency (zero-IF) architecture navigation receivers,

this paper proposes a suppression method based on a complex analytic bandpass filter. The proposed method is

used to optimize the parameters of the receiver′s radio frequency (RF) front-end to achieve spectral separation

between the image interference and the navigation signal, followed by the design of a complex analytic bandpass

filter to suppress image interference. First, this paper theoretically demonstrates that in-phase/quadrature-phase

(I/Q) mismatch during quadrature downconversion is the fundamental cause of image interference. Subsequently,

the impact of image interference on system performance is evaluated under the space-time minimum power antijamming algorithm. Based on this analysis, the proposed complex analytic bandpass filter is employed to suppress

image interference, followed by joint processing with the space-time minimum power anti-jamming algorithm.

Simulation and measured results validate that the proposed method effectively enhances the anti-jamming performance of the navigation receiver.

Key words:

image interference, anti-jamming, I/Q mismatch, navigation receiver

CLC Number:

References 25

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