空间光通信捕获与跟踪技术

空间光通信系统中,要在收信端与发信端之间快速建立通信链路,并在通信过程中维持链路的稳定与可靠,捕获,跟踪与对准技术——ATP(AcquisitionTrackingandPointing)技术至关重要。通过焦平面探测器阵列CCD(Charge-CoupledDevice)采集光学信号的图像,利用灰度直方图的性质推导出捕获判决条件,采用光电图象处理算法进行图像的二值化处理,根据质心公式计算光信号的空间坐标,得到的结果作为控制参数,再由控制装置进行收发双方的对准,并通过实验验证了捕获与跟踪的原理,实现了信标光的捕获与跟踪。

Research of Acquisition and Tracking Technology For Free-space Optical Communication

For setting up and maintaining a steady and reliable link between the transmitter and the receiver, ATP(Acquisition, Tracking and Pointing) technology plays a key role in free-space optical communication System. With capturing images of laser signal through Focal Plane Array Detectors - CCD (Charge Coupled Device), a novel scheme to acquire and track beacon beam is proposed, by using the features of grayscale histogram to deduce the criterion of acquisition and centroiding algorithm to calculate the coordinates of laser signal. Used the results as parameters, control devices can align the transmitter and the receiver. An experimental system, used to implement the alignment of transmitter and receiver and verify the theory of acquisition and tracking, is also demonstrated.