Security inspection apparatus and method of controlling the same

A security inspection apparatus, comprising a body fixed in a field and an electromagnetic imaging device installed on the body, wherein the electromagnetic imaging device comprising:

• a two-dimensional multiple-input multiple-output array panel, comprising:
• a plurality of two-dimensional multiple-input multiple-output sub-arrays, wherein each two-dimensional multiple-input multiple-output sub-array comprises a plurality of transmitting antennas and a plurality of receiving antennas, a midpoint of a connection line between each transmitting antenna of the plurality of transmitting antennas and a corresponding receiving antenna of the plurality of receiving antennas serves as an equivalent phase center, and the plurality of transmitting antennas and the plurality of receiving antennas are arranged such that the equivalent phase centers are arranged in a two-dimensional array;
• and
• a control circuit configured to control the plurality of transmitting antennas to transmit a detection signal in a form of an electromagnetic wave to an inspected object in a preset order, and to control the plurality of receiving antennas to receive an echo signal from the inspected object;
• a signal processing device connected to the two-dimensional multiple-input multiple-output array panel and configured to reconstruct an image of the inspected object according to the echo signal received;
• and
• a display device connected to the signal processing device and configured to display a reconstructed image of the inspected object,
• wherein each two-dimensional multiple-input multiple-output sub-array comprises two rows of transmitting antennas arranged in a first direction and two columns of receiving antennas arranged in a second direction perpendicular to the first direction, and the two rows of transmitting antennas and the two columns of receiving antennas form a rectangular pattern, and
• wherein the body is formed as an integrated structure, the integrated structure comprises a columnar structure, the electromagnetic imaging device comprises the plurality of two-dimensional multiple-input multiple-output sub-arrays, and the plurality of two-dimensional multiple-input multiple-output sub-arrays are arranged on a plurality of sidewalls of the columnar structure, so that the electromagnetic imaging device is distributed on the plurality of sidewalls of the columnar structure.