A ship-borne ground wave radar target direction finding method based on multi-time amplitude-frequency information of orthogonal magnetic antenna system

By using a multi-time amplitude-frequency information fusion method based on orthogonal magnetic antennas and taking advantage of the Doppler frequency shift variation of the bow direction of the shipborne platform, the problem of high-precision direction finding of shipborne high-frequency ground wave radar was solved, and high-precision direction finding of distant targets was achieved.

CN121918094BActive Publication Date: 2026-06-09CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Filing Date
2026-03-24
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Shipborne high-frequency ground wave radar is limited by space and platform movement, making it difficult to achieve high-precision target direction finding. Traditional array-type direction finding methods are insufficient in performance, and existing technologies cannot effectively improve the direction finding performance of low-speed shipborne platforms.

Method used

By employing an orthogonal magnetic antenna system and combining multi-time amplitude-frequency information, and utilizing the Doppler frequency shift of the target echo caused by the bow change of the shipborne platform, the target's azimuth is accurately estimated through the fusion of Doppler information and amplitude information.

Benefits of technology

It improves the direction finding performance of shipborne ground wave radar on long-range targets, breaks through the limitations of space constraints and array-type direction finding mode, and achieves high-precision target azimuth estimation.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121918094B_ABST
    Figure CN121918094B_ABST
Patent Text Reader

Abstract

The application relates to a shipborne ground wave radar target direction finding method based on multi-time amplitude-frequency information of a quadrature magnetic antenna system, and belongs to the technical field of high-frequency ground wave radar direction finding. The method obtains radar time domain data, target detection results and attitude data of a shipborne platform during a change in a bow direction, and extracts target echoes according to the target detection results; time-frequency analysis is performed on the target echoes to obtain a Doppler and amplitude information time sequence, and the Doppler and amplitude information time sequence is framed according to a fixed frame length to construct a single-frame Doppler frequency shift change sequence. The amplitude response characteristics of two channels of the quadrature magnetic antenna are utilized, and a target azimuth initial estimation value is obtained by using a amplitude comparison algorithm; further, a theoretical Doppler frequency shift change sequence is generated by combining the attitude data, and single-frame azimuth accurate estimation is obtained by matching search through a least square criterion, and multi-frame results are smoothed to output a stable azimuth. The method has the advantages of high direction finding accuracy and strong robustness under the condition of target echo broadening.
Need to check novelty before this filing date? Find Prior Art