Research on integrated tracking and communication ATP system based on four-quadrant detector

With the continuous development of laser communication technology, UAV-based laser communication ATP system is gradually developing towards lightweight and miniaturization. This paper presents a multiplex system based on fourquadrant detector, which integrates tracking and communication. By using a four quadrant detector, the precision tracking detector and communication detector in conventional laser communication systems are combined into one. This can reduce the weight, size and power consumption of the fiber optic terminal. The receiving unit uses the diversity receiving and merging function of the four quadrant detector to improve the signal-to-noise ratio and improve the communication performance.