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Calibration method for millimeter-wave antenna array

A millimeter-wave antenna and calibration method technology, which is applied in the field of calibration of millimeter-wave antenna arrays, can solve problems such as complex algorithms and achieve the effect of improving calibration accuracy

Active Publication Date: 2014-03-12
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

The advantage of this method is that the engineering implementation is simple, and the disadvantage is that the algorithm is complex, and the calibration accuracy is controlled by the system parameters and the calibration algorithm.

Method used

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  • Calibration method for millimeter-wave antenna array
  • Calibration method for millimeter-wave antenna array
  • Calibration method for millimeter-wave antenna array

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings. The specific steps of a method for calibrating a millimeter-wave antenna array are as follows:

[0022] Step 1: Coarse calibration of the mmWave antenna array.

[0023] The calibration metal plate 1 is placed in the middle of the imaging area of ​​the imaging system 3, and the distances from the reflective surface of the calibration metal plate to the antenna surface of each transmitting and receiving channel of the millimeter-wave antenna array 2 are as consistent as possible. Under the condition that the antenna array remains stationary, the millimeter-wave signal scans the calibration metal plate from top to bottom through each transceiver channel of the antenna array to obtain sampling data, which is defined as S Cal (θ 0 ,ω,z), where, θ 0 Indicates that the antenna array is sampling at a fixed angle at this time, ω indicates the frequency of the signal transmit...

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Abstract

The invention discloses a calibration method for a millimeter-wave antenna array. Coarse calibration of the amplitude and the phase of the antenna array is realized through a calibration metal plate by an external reference calibration method; then three-dimensional space reconfiguration of the calibration metal plate is realized by a wavefront reconstruction algorithm based on space frequency interpolation, and precision calibration of the phase is realized by correcting the phase of the antenna array through self-focusing of a three-dimensional space scattering intensity distribution sectional drawing. According to the calibration method, under the condition that an extra calibration algorithm is not added, the precision for calibrating the millimeter-wave antenna array is greatly improved by an imaging algorithm and the external reference calibration method.

Description

technical field [0001] The invention relates to a method for calibrating a millimeter wave antenna array. Background technique [0002] With the continuous promotion of short-distance active millimeter-wave cylindrical scanning imaging systems, the unbalanced amplitude and phase of the millimeter-wave antenna array used in the system limits the image quality of the imaging system and the effective detection of dangerous goods. How to effectively reduce the The unbalanced amplitude and phase of the small millimeter-wave antenna array has become a key technology for close-range active millimeter-wave cylindrical scanning imaging. [0003] At present, the calibration methods of millimeter-wave antenna arrays that have been applied for include: hardware channel calibration, antenna mutual coupling calibration, external reference calibration, and target imaging calibration. Hardware channel calibration is to compensate the amplitude and phase by adding hardware to each channel o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4026
Inventor 温鑫方维海费鹏年丰
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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