Study On Key Technologies Of Spaceborne Laser Reflection Tomography Imaging

Synthetic aperture laser imaging radar(SAIL)is an optical imaging means to acquirecentimeter-class resolution on a long distance observation. Accordingly there are therigorous constraints to the amplitude, polarization, frequency, temporal phase andspatial phase of optical signals in time domain and space domain during the signalcollection and image reconstruction. There is a higher difficulty in practicalapplication. In order to solve the contradiction between the imaging range and highresolution, and avoid the synchronization problem of optical signals’ time phase andspace phase which is difficult to achieve in practical application. Key technologies oflaser imaging based on CT principles were studied in this paper. Laser reflectiontomography is a new method of long distance and high precision imaging, especiallyin the space environment which without the influence of atomospheric attenuation tolaser, has great application prospects in the field of spaceborne platform to monitorsensitive space target. Key technology of laser reflection tomography imaging forspaceborne moving platform has been considered to be the frontier and hot area. Greatscientific significance and research value could be achieved with the help of laserreflection tomography technology.In this paper, laser reflection tomography technology applied to spaceborneplatform was studied in depth. The difference between transmission tomography andreflection tomography was detail analysised. As to reconstruct image from reflectiontomography data, the projection registion method of Non-cooperation objectives wassolved. Furthermore, low noise applification photoelectric detection circuit wasdesigned and week optical signal was lossless received. The parameters andcharacteristics of flying around the satellite, a laser reflection tomography experimentplatform was eventually designed and implemented. Meanwhile, obtained a batch ofvaluable experimental data, and the paper demonstrated and designed the technicalindicators of spaceborne laser reflection tomography image system, which laid thefoundation for spaceborne platform practical application.The main innovations of this paper lied in the following areas:(1) According to the reflection tomography imaging principle, The method of orbitdetermination, orbital characteristics and vibration characteristics of fly aroundsatellite platform were analysised. Laser reflection tomography experimental platform was builted to simulate the spaceborne platform conditions.(2) Tracking echo peak point and combing use phase recovery image registrationmethod to set up relationship of rotation center alignment of non-cooperationobjectves.(3) Carried out experiment of reflective tomography, obtained laser reflectiontomography experimental data of40m distance, then used filter back projectionreconstruction algorithm to achieved0.15m resolution of target profile.