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Time-frequency domain combined ground radar automatic target recognition method and system

A technology of automatic target recognition and joint time-frequency, applied in radio wave measurement systems, instruments, etc., can solve the problems of low recognition accuracy and limited feature information, achieve high judgment efficiency, high accuracy, and improve recognition performance

Active Publication Date: 2020-05-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current classification and recognition methods are either based on time domain or frequency domain for feature extraction, the extracted feature information is limited, and the recognition accuracy is low

Method used

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  • Time-frequency domain combined ground radar automatic target recognition method and system
  • Time-frequency domain combined ground radar automatic target recognition method and system
  • Time-frequency domain combined ground radar automatic target recognition method and system

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Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Such as figure 2As shown, a comprehensive time domain, frequency domain radar target recognition method, the specific steps are:

[0051] The first step is to build a radar target recognition system based on time-frequency domain features. The radar target recognition system based on time-domain and frequency-domain features includes: feature calculation module and judgment recognition module.

[0052] The characteristic calculation module is used to calculate the characteristics of the target, including: (1) time-domain waveform irregularity, (2) time-domain waveform smoothness, (3) time-domain waveform variance, (4) effective reflection area, (5) main peak Spectral width, (6) Broadened spectral width, (7) Frequency domain waveform entropy, (8) Frequency domain waveform second-order central moment, (9) Peak energy ratio, (10) High frequency component content, (11) Singular value waveform Attenuation speed, (12) Stability of singular value waveform, (13) Energy concen...

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PUM

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Abstract

The invention discloses a time-frequency domain combined ground radar automatic target recognition method and system. The recognition method comprises the steps: carrying out the time-domain feature extraction of I and Q paths of echo signals, carrying out the Fourier transform of a baseband echo signal after the down-conversion processing of a radar echo signal, and extracting the frequency-domain features; and sending the extracted time domain features and the frequency domain features to a classifier, and performing judgment according to output values. The system comprises a feature calculation module used for calculating and obtaining feature information of a target; and a judgment identification module which is used for sending the extracted features into the designed classifier and determining target attributes according to an output judgment result. The method is easy to implement, high in judgment efficiency and high in ground radar target attribute recognition accuracy of thelow-resolution radar.

Description

technical field [0001] The invention belongs to the field of ground moving target reconnaissance radar digital signal processing field, in particular to a ground radar automatic target recognition method and system combining time-frequency domain. Background technique [0002] The target echo composition of ground radar is relatively complex. In addition to the targets such as people and vehicles that need to be detected, there may also be strong ground clutter. Modern information warfare has higher and higher requirements for reconnaissance radar. Radar not only needs to be able to detect targets, but also needs to identify target attribute information, which requires radar to have the function of automatic target classification and recognition. Radar target recognition technology plays an important role in homeland defense and battlefield target reconnaissance, and is an important content in the development of radar. [0003] Radar target recognition is based on the backw...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/35G01S7/292
CPCG01S7/41G01S7/415G01S7/411G01S7/354G01S7/2923Y02A90/10
Inventor 谢仁宏孙泽渝芮义斌李鹏郭山红王丽妍边晨光王欢吕宁
Owner NANJING UNIV OF SCI & TECH
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