Terahertz inverse synthetic aperture radar imaging method based on frequency modulation step frequency

An inverse synthetic aperture and frequency modulation stepping technology, which is applied in the field of communication, can solve the problems of high resolution, laser beam distortion and jitter, and the inability to achieve high resolution of inverse synthetic aperture radar imaging, so as to achieve high resolution in distance and overcome The effect of low resolution in the distance direction

Active Publication Date: 2013-12-18
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is: the laser pulse signal is used, which is easily affected by the weather and the atmosphere during work, causing the laser beam to be distorted and shaken, which directly affects the working accuracy of the radar, and cannot achieve the high-resolution effect of inverse synthetic aperture radar imaging.
The disadvantage of this method is: this method is an imaging method based on optoelectronics, it can only image objects at a short distance, and the resolution achieved by the imaging is not as high as that achieved by the inverse synthetic aperture method

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  • Terahertz inverse synthetic aperture radar imaging method based on frequency modulation step frequency

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[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Refer to attached figure 1 , the concrete steps of the present invention are as follows:

[0034] Step 1, obtain the terahertz pulse echo signal.

[0035] The terahertz radar receiver receives the terahertz frequency modulation step frequency signal reflected by the target scattering point, and obtains the terahertz frequency modulation step frequency echo signal. The terahertz frequency modulation step frequency echo signal is composed of a terahertz frequency modulation step frequency pulse train. Each burst consists of chirps.

[0036] Using the mathematical model of chirp signal to obtain the mathematical model of FM step frequency, the mathematical model used is as follows: a set of terahertz FM step frequency signal is composed of M chirp pulses, and the mth chirp pulse transmitted can be written as :

[0037] c ...

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Abstract

The invention discloses a terahertz inverse synthetic aperture radar imaging method based on a frequency modulation step frequency to solve the problem that in the prior art, the range resolution and the direction resolution of inverse synthetic aperture radar imaging in the microwave band are not high. The method includes the steps of firstly, obtaining a terahertz pulse echo signal; secondly, conducting pulse compression; thirdly, synthesizing a broadband; fourthly, conducting windowing and correcting; fifthly, conducting distance Doppler imaging; sixthly, obtaining an imaged picture. According to the method, the characteristic that the terahertz wave has the high frequency and the broadband is combined with the frequency modulation step frequency system so that the high-resolution terahertz inverse synthetic aperture radar imaging can be achieved through the method of synthesizing the broadband.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a terahertz inverse synthetic aperture radar imaging method based on frequency modulation step frequency in the technical field of inverse synthetic aperture radar. The invention adopts the frequency modulation step frequency system and the signal of the terahertz band to realize high-resolution inverse synthetic aperture radar imaging, so as to solve the problem of low resolution of ordinary microwave band signal inverse synthetic aperture radar imaging, and obtain high-resolution inverse synthetic aperture radar imaging picture. Background technique [0002] Terahertz waves are electromagnetic waves between millimeter waves and infrared light (frequency ranges from 0.1THz to 10THz), and it is also the last frequency band that humans have not yet fully recognized and utilized. Terahertz wave combines the advantages of microwave, millimeter wave and infrared light, a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 王敏舒鑫王伟
Owner XIDIAN UNIV
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