Passive Millimeter Wave Imaging System Servo Unit Design And Research Of Image Correction Algorithm

Millimeter waves can pass through the cardboard, wood, clothing, fog, clouds, fire, etc., millimeter difference in energy and non-metallic objects while metal objects radiate significantly. Passive millimeter wave imaging system to achieve millimeter-wave radiation energy by collecting different parts of the imaging scene, this imaging modality is able to detect the human body to carry concealed metal objects, and does not produce radiation damage to the human body, can be well applied in airports, railway stations and other public places in human security. In all passive millimeter wave imaging systems, single mechanical two-dimensional scan imaging simple, low cost, but poor real-time imaging, large errors; staring focal plane array imaging surface does not require mechanical scanning, real good, but the channel array design consistency is difficult, very difficult to achieve the current level of technology intended effect. Line scan imaging focal plane array, using multiple channels and lines of lenses focal plane array, fast sweep through the pitch swing mirror, two-dimensional imaging, enabling larger FOV imaging equipment in a smaller amount of the conditions, the imaging speed faster, can achieve the highest stage.This article relies on specific research projects, real-time imaging tradeoff, implementation complexity, equipment costs and other engineering factors, discussed institutional passive millimeter wave imaging systems, research fast and reliable way to scan and project implementation. Details are as follows:1. Passive millimeter wave imaging of the overall system solution is studied, the relationship of mutual restraint system, research imaging speed, scan range, movement speed, channel integration time between other technical indicators are analyzed.2. Specific applications for the system to study the fast-scan mirror swing process, "trapezoid" and "triangle" deceleration motion model; system according to the indicator, the overall program to study the servo mechanism, the servo unit of the analysis of the mechanical structure, the motor, position sensor, the control technical indicators hardware and other components, and were completed selection, given the servo unit project implementation.3. Designed based on DSP TMS320F28335 servo motor controller, to complete schematic and PCB design, and each interface circuit debugging, analysis preliminary experimental system servo electrical connections, gives the corresponding interference method.4.For single-channel pre-lens antenna experimental system designed two-dimensional scanning mode, the DSP controlled studies Panasonic A4 servo motor, gives its deceleration in the position control mode DSP control method, and in TI CCS3.3 environment, programming the acceleration and deceleration mode, the horizontal scanning were used in the scanning direction and pitch.5.Through the system test and found mechanical scanning imaging image dislocation problems, analyze the reasons, fitting the experimental scan trajectories, and finally study the millimeter wave image misalignment correction algorithm is applied to post-processing.