A high-precision distance estimation method, device and system for shipborne mobile ground wave radar

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By using the fast-slow time domain combined platform motion compensation signal in the ship-borne ground wave radar, the distance measurement error problem caused by distance-speed coupling modulation when the ship-borne platform is maneuvered is solved, and high-precision distance estimation is achieved.

CN119493095BActive Publication Date: 2025-03-25NAT UNIV OF DEFENSE TECH

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Patent Information

Application Number: CN202510082277.1
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2025-01-20
Publication Date: 2025-03-25
Estimated Expiration: 2045-01-20

Application Information

Patent Timeline

20 Jan 2025

Application

CN202510082277.1

25 Mar 2025

Publication

CN119493095B

IPC: G01S7/41; G01S13/08; G01S7/40

CPC: G01S7/41; G01S7/40; G01S13/08

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Application Domain

Radio wave reradiation/reflection

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AI Technical Summary

Technical Problem

The prior art fails to effectively consider complex distance-speed coupled modulation when maneuvering onboard platforms, resulting in a decrease in distance measurement accuracy.

Method used

By combining the multi-degree-of-freedom attitude motion data of the ship-borne platform in the coherent accumulation period, a platform motion compensation signal with a fast-slow time domain combined is generated to eliminate the distance measurement error caused by platform maneuver.

Benefits of technology

High-precision distance estimation in the case of platform maneuvering is achieved, distance measurement error is eliminated, and radar signal processing is improved.

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Abstract

The present invention relates to a high-precision distance estimation method, device and system for a shipborne mobile ground wave radar. The method comprises: obtaining a platform motion compensation signal in a fast-slow time domain combination according to the multi-degree-of-freedom motion parameters and radar waveform of the shipborne platform within the radar coherent accumulation period; obtaining array radar sampling data after compensating the data of all frequency sweeping periods of all antennas; adding the array radar sampling data in the antenna dimension to obtain radar beamforming data; padding the radar beamforming data with zeros at the end of the fast time domain data, performing fast time domain FFT and slow time domain FFT to obtain a distance-Doppler spectrum after platform motion compensation and beamforming; compensating for the distance-velocity coupling error of the target uniform motion, and obtaining the final target high-precision distance estimation result. The present invention takes into account the influence of platform maneuvering motion, distance estimation quantization error and target uniform motion speed on distance estimation, and is suitable for high-precision distance estimation of shipborne mobile ground wave radar.

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