Radar original echo data blind focusing imaging method

CN119620069AActive Publication Date: 2025-03-14NANJING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411592888.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-08
Publication Date
2025-03-14
Estimated Expiration
2044-11-08

AI Technical Summary

Technical Problem

Existing radar imaging algorithms require knowledge of radar system parameters to generate images, and cannot generate high-quality radar images without the unknown system parameters.

Method used

A blind focus imaging method for radar original echo data is proposed. PRI coarse estimation and fine estimation are performed through the approximate periodic model of one-dimensional original data amplitude signal and the principal component maximization method, and the one-dimensional data is restored into a two-dimensional data matrix. The approximate matching filtering model of radar image is established using reference point echo and approximate translation invariance models, and the radar image is restored through the matching filtering method.

Benefits of technology

Without knowing any radar system parameters, high-quality images can be effectively restored from the radar raw data, solving the image formation problem in the case of unknown PRI.

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Abstract

The invention discloses a radar original echo data blind focusing imaging method, which comprises the following steps of: based on an approximate periodic model of a one-dimensional original data amplitude signal and a PCM (Pulse Code Modulation) method, carrying out pulse repetition interval coarse estimation and fine estimation so as to recover one-dimensional data into a two-dimensional data matrix; establishing an approximate matching filtering model of the radar image by using the reference point echo and the approximate translation invariance model; the method comprises the following steps: segmenting original two-dimensional echo data into a plurality of blocks, normalizing the energy of each block, and estimating reference echoes by using a PCM (Pulse Code Modulation) method; and recovering a radar image through a matched filtering method by using the estimated reference echo. According to the method, the high-quality radar image can be recovered from the original data without depending on radar system parameters.
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Citation Information

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