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针对自由空间光通信中对信标光进行快速、准确定位的要求,基于一种新型四象限探测器设计,提出了采用归一化函数方法获得光斑参数。首先,根据电流与相应光斑面积关系之比,可以得出光斑半径;其次,利用归一化函数的方法获得光斑中心偏移量的估计量;再次,采用查表法简化了函数的运算复杂度;最后,利用误差分析方法得出光斑中心偏移量的估计误差。理论分析和仿真表明,该方法能够精确地估计出光斑的半径和位置,光斑半径估计误差在±0.01%以内,光斑位置的估计误差在±0.005%以内。算法计算复杂度低,测量跟踪速度快,定位准确,可以广泛应用于自由空间光通信。
Aiming at the requirement of fast and accurate positioning of beacon light in free space optical communication, a new four-quadrant detector design is proposed to obtain the spot parameters by using the normalized function method. First, the spot radius can be obtained according to the ratio of the current to the corresponding spot area. Secondly, the normalized function is used to get the estimate of the spot center offset. Thirdly, the look-up table is used to simplify the computation complexity of the function Finally, error estimation method is used to get the estimation error of spot center offset. Theoretical analysis and simulation show that the method can accurately estimate the spot radius and position, the spot radius estimation error is within ± 0.01% and the spot position estimation error is within ± 0.005%. The algorithm has low computational complexity, fast measurement and tracking, and accurate positioning. It can be widely used in free space optical communication.