Double-calibration antenna radio frequency channel calibration method for millimeter wave security check imaging

A technology of radio frequency channel and calibration method, applied in radio wave measurement system, geophysical measurement, instrument and other directions, can solve problems such as poor imaging effect

Pending Publication Date: 2021-01-01
北京子兆信息技术有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor radio frequency channel calibration imaging in the prior art, and to provide a method for calibrating radio frequency channels with dual calibration antennas for millimeter wave security inspection imaging. The dual-calibration antenna radio frequency channel calibration method does not need to directly measure the position coordinates of the calibration antenna, but obtains the true value of the calibration antenna position through statistical analysis of data, so as to accurately realize the calibration of the radio frequency transceiver channel, making the millimeter-wave security imager better imaging

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  • Double-calibration antenna radio frequency channel calibration method for millimeter wave security check imaging
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  • Double-calibration antenna radio frequency channel calibration method for millimeter wave security check imaging

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Embodiment Construction

[0049] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0050] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating relative importance, or implicitly indicating the quantity of indicated technical features. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features; "plurality" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, possible presence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0051] Also,...

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Abstract

The invention relates to the technical field of radio frequency channel calibration, and discloses a double-calibration-antenna radio frequency channel calibration method for millimeter wave securitycheck imaging, and the method comprises the steps: respectively obtaining calibration test data through two external calibration antennas which just need to roughly estimate the positions; and throughmutual calibration and related analysis processing between the two groups of calibration test data, accurately calculating the position coordinates of the two calibration antennas, and thus completing calibration of the radio frequency receiving / transmitting channel. According to the double-calibration-antenna radio frequency channel calibration method for millimeter wave security check imaging,the position coordinates of the calibration antennas do not need to be directly measured, the positions of the calibration antennas are accurately obtained through data statistical analysis, the positioning precision is high, so that the calibration result of the radio frequency receiving / transmitting channel of a corresponding system can meet the imaging quality requirement.

Description

technical field [0001] The invention relates to the technical field of radio frequency channel calibration, in particular to a radio frequency channel calibration method for dual calibration antennas used for millimeter wave security inspection imaging. Background technique [0002] Active millimeter-wave security imagers usually use multi-channel MIMO working mode, such as figure 1 As shown, in order to reduce the cost of system hardware and improve the imaging speed of the system at the same time. In order to improve the imaging performance of the system, it is necessary to calibrate the amplitude-frequency characteristics, phase-frequency characteristics, and electrical length of each RF receiving / transmitting channel before imaging. In addition, according to the relevant requirements of the imaging algorithm, the detection signal of any transmitting and receiving antenna pair in the antenna array for the target to be measured should use the phase center of the correspon...

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Application Information

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IPC IPC(8): G01S7/40G01V13/00
CPCG01S7/4026G01V13/00
Inventor 孙国琳欧乃铭姚现勋
Owner 北京子兆信息技术有限公司
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