大气湍流中空间光至单模光纤耦合的跟踪算法

 通过模拟湍流波前的振幅起伏及相位起伏，研究了采用CCD探测器的湍流波前倾斜校正系统的空间光到单模光纤耦合功率的衰落特性，对CCD图像的跟踪算法进行了研究。仿真结果表明，在接收孔径直径与Fried 参数的比值较大时，采用质心跟踪算法的倾斜校正系统的性能很差，耦合光功率会产生严重衰落。提出了一种高斯模板匹配的倾斜校正跟踪算法，在湍流较强时，可以有效地降低耦合光功率的衰落深度，并且可以避免采用质心算法可能出现的大孔径接收性能低于小孔径的不利情况。

Tracking algorithms for coupling space light distorted by turbulence into single mode fiber

By simulating amplitude and phase fluctuations induced by atmospheric turbulence,signal fading for coupling space light into single mode fiber is studied in wavefront tip-tilt corrected system.Tracking algorithm of CCD image is studied.Simulation results show that when the ratio of the receiving aperture to the Fried's parameter is large,the performance of tip-tilt corrected system using centroid tracking algorithm is very poor and the signal fading depth is very large.A gaussian template matching tracking algorithm is proposed and by using this algorithm,the signal fading depth can be reduced greatly when the ratio of the receiving aperture to the Fried's parameter is large,and that the disadvantage of the performance of large aperture may be inferior to that of small aperture can also be avoided which may occur using centroid tracking algorithm.