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Frequency point power self-adaptive control method for stepped frequency through-wall radar

A technology of adaptive control and step frequency, applied in the field of radar, can solve problems such as large positioning error, ranging error, and reduce the distance resolution capability of through-wall radar, so as to improve accuracy, eliminate broadening and distortion, and ensure flatness. Effect

Inactive Publication Date: 2012-09-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

The target echo pulse broadening will reduce the distance resolution ability of the through-wall radar, and the target echo pulse distortion will introduce ranging error (the propagation distance between the radar and the target), resulting in a large positioning error, which cannot realize the detection of buildings. Precise positioning of hidden human targets inside

Method used

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  • Frequency point power self-adaptive control method for stepped frequency through-wall radar
  • Frequency point power self-adaptive control method for stepped frequency through-wall radar
  • Frequency point power self-adaptive control method for stepped frequency through-wall radar

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Embodiment

[0033] An example of a step-frequency through-wall radar with adaptive control of frequency point power, in which the frequency source of the transmitter is realized based on a direct digital frequency synthesizer (DDS), and the DDS generates a stepped frequency continuous wave signal of 0.5GHz-1.5GHz , A total of 251 discrete frequency points are set, and the interval between adjacent frequency points is 4MHz; the computer PC is used as the signal processor and display control terminal of the device, and the display and control graphical human-computer interaction interface based on VC++ is set with clay brick walls and cinder brick walls There are three wall type options: and cement brick wall.

[0034] Based on the above-mentioned stepped frequency through-wall radar system, the specific working process of the frequency point power adaptive control method of the present invention is as follows:

[0035] (1) VNA is used to generate stepped frequency continuous wave signals with t...

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Abstract

The invention provides a frequency point power self-adaptive control method for a stepped frequency through-wall radar. The method comprises the following steps of: determination of the attenuation characteristic of a wall: determining the power attenuation characteristic of each discrete frequency point of an ultra-wideband stepped frequency signal in the process of penetrating through the wall forwards and backwards for two times; and control over the transmitting power of the frequency points: determining the power attenuation characteristic corresponding to the wall type of a building which is currently detected, and pre-compensating the transmitting power of each discrete frequency point on an ultra-wideband stepped frequency transmitter according to the power attenuation characteristic in the process of penetrating through the wall forwards and backwards for two times. By adoption of the frequency point power self-adaptive control method for the stepped frequency through-wall radar, the flatness of the power of each frequency point of a target echo of a human body can be ensured, widening and distortion of pulse waveform caused by power fluctuation of the frequency points of the stepped frequency target echo are eliminated, and the positioning accuracy of a hidden human body target in the building is improved.

Description

Technical field [0001] The invention relates to radar technology, in particular to step-frequency through-wall radar technology. Background technique [0002] As the only detection device that can penetrate the walls of buildings to detect hidden human targets inside buildings, through-wall radar uses electromagnetic waves of specific frequencies that can penetrate the walls of buildings, and extracts the position of human targets through echo signal processing Information such as, status and vital characteristics can realize the detection, positioning, tracking, imaging and recognition of hidden human targets inside the building. Penetrating radar can be widely used in public security, armed police, customs, security, fire protection and other fields, and has important research value and broad application prospects. [0003] According to research results at home and abroad, one of the main detection functions of the through-wall radar is the location of hidden human targets insid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/282
Inventor 孔令讲贾勇杨晓波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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