Research On Wave-front Distortion Calibration Based On The Improved Simulated Annealing Algorithm

The wave-front aberration correction algorithm based on improved simulated annealing(SA) algorithm is discussed carefully in this thesis. SA algorithm is an excellent algorithmduring the adaptive optimization algorithm. So it is expected that the SA algorithm can makeit possible to realize the real-time dynamic wave-front aberration correction in theatmospheric channel. We present the use of combining SA algorithm and image qualityevaluation function to achieve the wave-front aberration correction. The state generatingfunction of SA algorithm, the cooling schedule and other parameters have been improvedand optimized which makes it more efficient to correct the wave-front aberration with SAalgorithm. An image quality evaluation function based on the principle of diffractionimaging is proposed, which can reflect the quality of the image plane spot better andimprove the effect of the correction algorithm.First, the physical model and application principle of the SA algorithm are described.We compare the SA algorithm with several other commonly used adaptive algorithms. Thenthe convergence properties and calibration capabilities of the SA algorithm are analyzed. Wealso propose a program to improve the SA algorithm against for the wave-front distortion inthe atmosphere channel.Second, the definition and application principle about the image quality evaluationfunctions are described in the thesis. On this basis, an image quality evaluation function J isproposed based on the diffraction imaging principle, and its convergence properties havebeen proved theoretically.Subsequently, the components of the wave-front correction system which is based on theimproved SA algorithm are described, after that the simulation model of the correctionsystem is constructed. The numerical model of atmosphere turbulence is built by the powerspectral inversion method, by which we can obtain static wave front distortion. Based on theturbulence model, the influence on the beam passing though the atmosphere turbulence is analyzed.At last, a numerical simulation model of wave-front distortion calibration system is setup based on improved SA algorithm. The operation result indicates that the improved SAalgorithm is robust and convergent. we make a simulation to correct the distortion by usingevaluation function J. The result shows that J is superior to the traditional image qualityevaluation function SR. The advantages of the evaluation function J is more obvious whenpower fluctuate is considered.