Millimeter wave three-dimensional imaging method for scanning scenes outside or inside cylinder for security check

Abstract

The invention discloses a millimeter wave three-dimensional imaging method for scanning a scene outside or inside a cylinder for security check, and the method comprises the steps: transmitting N stepping frequency signals to a target through N antennas of a linear array antenna, and enabling the N antennas of the linear array antenna to receive (2N1) one-dimensional echo signals generated after the stepping frequency signals transmitted by the N antennas reach the target; obtaining a three-dimensional target echo signal based on the (2N1) one-dimensional echo signals; obtaining target echo signals after decoupling in the height direction and the distance direction according to the three-dimensional target echo signals; and carrying out distance and orientation two-dimensional coherent processing on the target echo signals decoupled in the height direction and the distance direction to obtain a target three-dimensional image. Three-dimensional high-resolution imaging of a target is realized by scanning outside a cylinder and carefully scanning in the cylinder in combination with omega k and BP algorithms. Compared with an existing three-dimensional millimeter wave imaging method ofa cylindrical security check instrument, the three-dimensional millimeter wave imaging method has the advantages that the security check efficiency can be improved to a great extent, and the securitycheck work intensity is improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a millimeter-wave three-dimensional imaging method for scanning the scene outside or inside a cylinder for security inspection. Background technique [0002] In recent years, due to the severity of the international and domestic public security situation, security checks in public security places such as railway stations, airports, and subways are particularly important. Traditional security inspection methods such as metal detectors and X-ray security inspection machines are not suitable or efficient for human security inspection due to their respective limitations. Millimeter waves have inherent advantages such as strong penetrating ability, low radiation to the human body and high resolution, and are especially suitable for hidden object detection. Therefore, millimeter wave imaging provides a new option for human body security inspection and has br...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned 3D millimeter-wave imaging method can realize 3D scene imaging and security inspection tasks, when the number of scene grid points is large, using the BP (Back Projection, 3D back projection) algorithm for 3D imaging will greatly increase the amount of computation , it is difficult to meet real-time human security inspection

Images