Aircraft target classification method for frequency modulated continuous wave radar based on multi-range cell fusion
A frequency-modulated continuous wave and distance unit technology, applied in the field of radar, can solve the problems of reduced recognition performance, loss of micro-motion information, inability to meet approximate conditions, etc., to achieve the effect of improving utilization and improving classification performance
Active Publication Date: 2020-04-21
XIDIAN UNIV
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[0007] In the frequency modulation continuous wave radar system, due to the existence of high-speed moving rotor parts, the aircraft target echo will have obvious spectral peak splitting, and the micro-motion components are distributed on different range units, which cannot satisfy the above-mentioned approximation that the target is in a single range unit. Conditions, the existing method only extracts the echo of the range unit where the target of the fuselage is located for processing, which will lose a lot of micro-motion information and reduce the recognition performance
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[0025] Reference figure 1 The specific implementation steps of the example of the present invention are as follows:
[0026] Step 1. Observe the time-domain echo difference frequency signal of the aircraft target.
[0027] The radar observes m frequency modulation cycles, receives the echo difference frequency signal of the aircraft target, and obtains the time-domain echo matrix s=[s 1 ,s 2 ,...,S i ,...,S m ] T , Where s i Is the column vector echo of the i-th FM cycle, i=1, 2,...,m.
[0028] It should be noted that each row of the time-domain echo matrix s represents the time-domain echo difference frequency signal of one modulation period. After the pulse pressure of the FM continuous wave time-domain signal, it reflects the information of different distance units, which is equivalent to time Each column of the field echo matrix s represents the information of a different distance unit.
[0029] Step 2: FFT the time-domain echo difference frequency signal of each cycle with D time...
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The invention discloses a frequency modulated continuous wave radar aircraft target classification method based on integration of multiple distance units, and mainly solves the problems in the present method that only the echo of the distance unit in which the fuselage target is located is extracted to be processed, and a lot of micro-dynamic information is lost and the recognition performance is reduced. The implementation process is that observation of multiple frequency modulation periods is performed through radar, and the echo difference frequency signal of aircraft targets is received; fast Fourier transform processing of multiple times the original signal length is performed on the time domain echo difference frequency signal of each period; three multi-distance-unit integration characteristics of the sample are extracted; the classifier is trained by using the multi-distance-unit integration characteristics of the training sample; and the multi-distance-unit integration characteristics of the test sample are inputted to the classifier so as to obtain the classification result of three types of the aircraft targets. The recognition performance can be enhanced, and the method can be used for the frequency modulated continuous wave radar system to integrally process the echo information dispersed in multiple distance units and then perform classified recognition.
Description
Technical field [0001] The invention belongs to the field of radar technology, and particularly relates to a classification method of air moving targets, which can be used in a frequency modulated continuous wave radar system to perform classification and recognition after comprehensive processing of echo information scattered in multiple range units. Background technique [0002] In recent years, the micro-motion characteristics have received extensive attention in radar target recognition. Fretting refers to the vibration or rotation of the radar target in addition to the translation of the center of mass. In 2000, Victor C. Chen of the US Naval Research Laboratory first published the experimental results of micro-Doppler effect analysis in microwave radar. Experiments show that different micro-motions will produce different micro-Doppler modulations. The micro-Doppler effect can reflect the geometric composition and motion characteristics of the target structural components. ...
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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 纠博刘宏伟张华斌冯家贲王鹏辉
Owner XIDIAN UNIV