A phase center calibration method of a large-scale broadband conformal digital array

By calculating the channel residual frequency response error and array pattern of the conformal digital array, and combining the linear fitting equation and beam weighting coefficients, the problem of phase center calibration of large-scale broadband conformal digital arrays is solved, and accurate phase center estimation and calibration in a wide frequency band is achieved.

CN117741269BActive Publication Date: 2026-06-02CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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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
2023-12-11
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies cannot accurately calibrate the phase center of a large-scale broadband conformal digital array without being limited by far-field or near-field test conditions and array geometry, especially the phase center at any scanning angle over a wide frequency range.

Method used

By obtaining the channel residual frequency response error of the conformal digital array, the array amplitude and phase pattern are calculated, the phase center value is estimated using a linear fitting equation, and the phase center is calibrated using beam weighting coefficients and time delay compensation values.

Benefits of technology

It enables accurate estimation of the array phase center at any scanning angle within a wide frequency range, simplifies calibration complexity, is applicable to large-scale broadband conformal digital arrays, and is suitable for digital receiver and transmitter arrays.

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Abstract

The application discloses a kind of phase center calibration methods of large-scale broadband conformal digital array, utilize the residual frequency response error of the element pattern of M antenna, receive or transmit channel, directly estimate the array amplitude pattern at any scan angle, any radio frequency operating frequency in wide space, wide frequency range, obtain the array phase pattern in 3dB beam width. Utilize this array phase pattern, can obtain the phase center at the scan angle, radio frequency operating frequency by least square method. By discretization division to wide space, wide frequency range, the phase center value of broadband conformal digital array at different discrete azimuth and elevation under wide space range can be calculated, and then the phase center value at any scan angle in wide frequency range is obtained. Utilize the phase center value, the beam weighting coefficient of each element, time delay compensation value relative to array geometric center can be calculated. The application is not limited by far-field test or near-field darkroom test condition.
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