A method for jointly estimating parameters of a rotating target based on whirling electromagnetic waves

By employing a joint parameter estimation method for rotating targets based on vortex electromagnetic waves, and utilizing maximum likelihood estimation and time-frequency analysis, the problem of high-precision parameter estimation for rotating targets with multiple scattering points is solved. This method enables accurate measurement of rotation radius, tilt angle, angular velocity, and position, thereby improving the accuracy of radar targeting.

CN117169843BActive Publication Date: 2026-06-19XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIDIAN UNIV
Filing Date
2023-08-30
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately estimate the rotation center position and rotation parameters of multi-scattering point rotating targets, and traditional methods suffer from large parameter estimation errors when the target's rotation axis is offset from the radar's radial direction.

Method used

A joint parameter estimation method for rotating targets based on vortex electromagnetic waves is adopted. By establishing a mathematical model, using maximum likelihood estimation and time-frequency analysis, combined with intelligent optimization algorithms and least squares method, the parameters of the rotating target are accurately estimated.

Benefits of technology

It achieves high-precision parameter estimation of rotating targets, including accurate measurement of rotation radius, tilt angle, angular velocity and position, reducing the error of traditional methods and improving the accuracy of radar targeting.

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Abstract

This invention discloses a method for joint parameter estimation of rotating targets based on vortex electromagnetic waves, comprising: establishing a typical detection scenario and obtaining mathematical models of the target's range, azimuth, and elevation angles in the radar coordinate system; establishing an electromagnetic vortex echo signal model and defining the parameter vector to be estimated; performing maximum likelihood estimation on the parameter vector to be estimated based on the echo time-domain signal to obtain the maximum likelihood estimator; performing time-frequency analysis on the echo signal under the multi-scattering point model, extracting the skeleton from the time-frequency spectrum to obtain the rotating Doppler curve; estimating unknown parameters from the rotating Doppler curve; and performing error analysis on the parameter vector to be estimated to derive its joint Cramer-Rao bound. Compared with traditional methods for detecting local peak points, the joint parameter estimation method for rotating targets based on vortex electromagnetic waves provided by this invention has higher accuracy and can accurately estimate the position of the rotating target.
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