A method for three-dimensional localization of airborne targets based on distributed ground radar cooperation

By performing three-point quadratic fitting and linearization processing at the radar end, combined with a height correction strategy, the problems of missing height-dimensional detection information and matrix ill-conditioning in three-dimensional positioning of distributed ground radar are solved, achieving higher positioning accuracy and robustness.

CN122307532APending Publication Date: 2026-06-30NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2026-04-01
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional distributed radar positioning methods suffer from missing height-dimensional detection information and matrix ill-conditioning in three-dimensional space, leading to deterioration in positioning accuracy. In particular, the target height error is significantly amplified under low-to-high geometric configurations, and existing algorithms cannot effectively solve this problem.

Method used

By refining the echo delay estimate through three-point quadratic fitting at the radar end, the data center introduces auxiliary variables to linearize the nonlinear equations. Combining the Lagrange multiplier method and the height correction strategy, the horizontal and height dimensions of the three-dimensional positioning are decoupled, and the optimal correction radar is selected for height correction to improve positioning accuracy.

Benefits of technology

It significantly improves the 3D positioning accuracy of aerial targets, optimizes the positioning performance in the height dimension, reduces performance fluctuations caused by scene changes, and enhances the robustness and environmental adaptability of the algorithm.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122307532A_ABST
    Figure CN122307532A_ABST
Patent Text Reader

Abstract

This invention discloses a three-dimensional positioning method for aerial targets based on distributed ground radar cooperation, comprising: constructing a cross-correlation function by transmitting and echoing signals, and obtaining the range estimate of each ground radar to the target through quadratic fitting; constructing a nonlinear spherical equation system, introducing auxiliary variables for linearization, and iteratively solving it using the Lagrange multiplier method to obtain the initial three-dimensional position estimate of the target; extracting the initial horizontal coordinates, obtaining the altitude correction contribution of each radar based on the geometric relationship between the radar and the target, adaptively selecting the radar with the largest contribution and satisfying the decoupling premise as the optimal correction radar, using its range information to decouple from the spherical range equation to obtain the altitude closed-form solution, and fusing the horizontal coordinates and the corrected altitude to obtain the final three-dimensional position. This invention overcomes the accuracy degradation problem caused by the lack of altitude dimension information and ill-conditioned matrix in traditional algorithms, and significantly improves the three-dimensional positioning accuracy of distributed ground radar for aerial targets.
Need to check novelty before this filing date? Find Prior Art