Double-arc MIMO antenna array and security check imaging device

Abstract

The present invention provides a double-arc MIMO antenna array. The double-arc MIMO antenna array comprises a transmitting antenna and a receiving antenna; the transmitting antenna is arranged on a first arc with a target adopted as the center; the receiving antenna is arranged on a second arc with the target adopted as the center; and the first radius of the first arc is not equal to the second radius of the second arc. An MIMO antenna array in the prior art is fraught with approximation error, particularly large error in a near field, and as a result, the MIMO array deviates from design indexes, and leads to serious side gate artifacts, which affects imaging quality. According to the double-arc MIMO antenna array of the invention, the transmitting antenna and the receiving antenna are arranged on the two arcs which adopt the target as the centers respectively, and therefore, approximation error is eliminated, and imaging quality can be ensured. The present invention also provides a security check imaging device. The device includes the above double-arc MIMO antenna array. With the security check imaging device adopted, security check efficiency can be improved, and costs can be reduced.

Description

technical field [0001] The present invention relates to the field of electromagnetic wave imaging, in particular to a dual-arc MIMO antenna array and a security imaging device. Background technique [0002] In today's increasingly severe anti-terrorism situation, public safety issues have been paid attention by the government and the public. Security inspection systems have been widely used in public places such as airports, railway stations, stadiums, and museums. Therefore, people are concerned about the efficiency, cost and complexity of security inspection systems The degree puts forward higher requirements. [0003] Multiple-Input Multiple-Output (MIMO) imaging radar is a radar that uses multiple combinations of transceiver antenna units to generate images with a small number of antennas. It has the advantages of fast data acquisition rate, low cost and system complexity. It has low-level characteristics and has significant advantages in fields such as human body secur...

AI Technical Summary

Problems solved by technology

Due to the need to satisfy the Nyquist sampling law, the sampling interval of the imaging system is generally less than λ / 2. With the increase of the sampling frequency, the single-receiving and single-transmitting mode requires a large number of transmitting and receiving antennas, which not only increases the cost and complexity of the system, but also Too many antennas increase the data sampling time, which is not conducive to the improvement of security inspection efficiency

The design of the linear MIMO antenna array is based on the principle of the equivalent phase center, but in near-field applications, this principle will produce approximation errors that cannot be ignored, resulting in poor image quality reconstructed by the MIMO antenna array and serious side grid artifacts.

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