Hidden hazardous material detecting method based on video SAR

A detection method and technology for dangerous goods, applied in the field of electronic signal processing, can solve the problems of not being able to find contraband, not having strong discrimination ability, not being able to detect human bodies, etc., and achieving convenient real-time imaging, Doppler frequency shift characteristics, and real-time monitoring. Effect

Inactive Publication Date: 2016-07-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

For example, X-rays have the advantages of high-resolution imaging, but strong radiation will cause harm to human health and cannot be directly used for human detection
The detection of hidden objects by infrared technology depends on the temperature difference between the hidden object and its background. Its resolution is not strong, and its penetration is weak, so it cannot find hidden prohibited items.

Method used

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Embodiment Construction

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the implementation methods and accompanying drawings.

[0018] see figure 1 , Arrange an arc-shaped track above the security check area, and set multiple radars with SAR working mode and the same working frequency on the track. The number of radars depends on the requirements of omni-directional imaging, generally speaking, there are 3 to 5 radars between;

[0019] When the radar is working, it reciprocates at a uniform speed along the arc-shaped track and emits linear frequency-modulated continuous terahertz waves, that is, linearly modulates the oscillation signal generated by the voltage-controlled oscillator (VCO) of the radar to obtain the emission signal in the terahertz frequency band.

[0020] Then the signal will be transmitted to the security inspection area through the radar ante...

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Abstract

The invention discloses a hidden hazardous material detecting method based on video SAR. According to the hidden hazardous material detecting method, an arc-shaped rail is arranged above a security checking area, and a plurality of radars with same working frequency in an SAR working mode are arranged on the rails; and in operation of the radars, the radars perform uniform-speed reciprocation along the arc-shaped rail and transmit a linear frequency modulation continuous terahertz wave, thereby forming an azimuth synthetic aperture image and obtaining a detected image of an object in the security checking area. According to the hidden hazardous material detecting method, the azimuth synthetic aperture image which is formed in uniform-speed motion of the radars in the arc-shaped rail is utilized for realizing long-distance real-time omnidirectional high-resolution image of the object in the security checking area, and furthermore quick imaging is performed through transmitting an electromagnetic wave with an ultrahigh frequency or higher frequency for preventing defocusing caused by object motion.

Description

technical field [0001] The invention belongs to the technical field of electronic signal processing, in particular to a video SAR-based detection method for concealed dangerous goods. Background technique [0002] Traditional security detection systems (metal detectors and X-ray scanners) have certain limitations in terms of human body safety and perspective imaging. At present, the technologies that have been applied to security inspection mainly include: X-ray, infrared, instrument, ultra-wideband and sound wave and other technologies. Although these technologies have their applicable occasions and characteristics, they all have certain defects for detecting people with concealed objects. For example, X-rays have the advantage of high-resolution imaging, but strong radiation will cause harm to human health and cannot be directly used for human detection. Infrared technology to detect hidden objects depends on the temperature difference between the hidden object and its b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/887G01S13/9027G01S13/9088
Inventor 闵锐吴雨霖皮亦鸣李晋曹宗杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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