A method for channel calibration and equalization of a wideband zero intermediate frequency receive array

By calculating the discrete-time Fourier transform and FIR equalizer coefficients, the problem of error estimation and compensation for broadband zero-IF receiving channels was solved, channel calibration and equalization were achieved, the image suppression capability of the array was improved, and the design of the correction source was simplified.

CN117713960BActive Publication Date: 2026-06-02CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
Filing Date
2023-11-02
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies cannot effectively estimate and compensate for various errors in broadband zero-IF receiving channels, making it impossible to achieve calibration and equalization of broadband zero-IF receiving digital array channels.

Method used

By calculating the discrete-time Fourier transform and FIR equalizer coefficients in each channel, the IQ imbalance and inter-channel frequency response error are estimated and compensated respectively. The point frequency signal is used as the correction source to simplify the correction source design.

Benefits of technology

It achieves error estimation and compensation for broadband zero-IF receiving channels, improves the image rejection ratio of the array, simplifies the design of the correction source, reduces the implementation complexity of the device, and is applicable to planar and conformal digital arrays.

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Abstract

The application discloses a kind of broadband zero intermediate frequency receiving array's channel calibration and equalization method, comprising: obtaining the baseband digital complex signal of each receiving channel of digital array;Obtain baseband digital complex single frequency signal;Obtain the spectrum value of each channel single frequency signal itself and the spectrum value of corresponding image signal;Calculate the first compensation value and the second compensation value of each channel IQ imbalance frequency response;Estimate the first FIR equalizer coefficient and the second FIR equalizer coefficient of IQ imbalance;Obtain the complex signal after IQ imbalance compensation;With the first receiving channel as reference, calculate the inter-channel frequency response compensation value of other channels relative to reference channel;Estimate the third FIR equalizer coefficient between channels;When array receives target signal, compensate the baseband digital complex signal received by array;The application has the advantages that: various errors of broadband zero intermediate frequency receiving channel are estimated and compensated, and broadband zero intermediate frequency receiving digital array channel calibration and equalization are realized.
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