基于水下光斑跟踪的接收机对准系统

Receiver Alignment System Based on Underwater Spot Tracking

针对水下无线激光通信中光斑易变形、易受湍流影响和易被遮挡的问题,采用均值漂移与无迹卡尔曼滤波器结合阈值判断的跟踪光斑算法,获取跟踪光斑实时位置坐标.分析得到光斑在被遮挡、变形和受湍流影响时,实际移动轨迹和跟踪移动轨迹的误差分别在2.1%、4%和1.2%左右,验证了算法的可行性.搭建接收机对准系统,利用跟踪光斑实时位置和中心位置的关系,控制接收机和发射机的实时对准.通过对比对准系统获得光斑的实际中心坐标和严格对准时光斑中心坐标之间的偏差,来反映系统的对准精度,实验结果发现接收机的运动角速度越大,对准精度越小.

Aiming at the problem that the light spot in underwater wireless laser communication is easily deformed,susceptible to turbulence and to be blocked,firstly,the tracking light spot algorithm of Mean Shift combined with unscented Kalman filter and threshold judgment is used to obtain the real-time position coordinates of the tracking light spot.The analysis results show that when the light spot is blocked,deformed or affected by turbulence,the error between actual movement trajectory and tracking movement trajectory are about 2.1%,4%,and 1.2%,respectively,which verifies the feasibility of the algorithm.A receiver alignment system is built to track the real-time position of the light spot.The real-time alignment of the receiver and transmitter is controlled based on the relationship of the real-time position and the center position.The alignment accuracy of the system is reflected by the deviation between the actual center coordinates and the center coordinates of the light spot obtained by comparing the alignment system.The experiment results show that the greater the angular velocity of the receiver's motion,the smaller the alignment accuracy.