自由空间激光通信捕获控制系统

Acquisition control system of free space laser communication

为了完成快速高概率的捕获,设计并构建了自由空间激光通信捕获控制系统,主要由主控计算机、GPS/INS捷联导航系统、数传电台和控制软件等部分组成。主控计算机采用嵌入式操作系统Windows CE,控制系统采用多线程同步技术和事件驱动方式处理多个通信串口的数据,减少了处理数据的延迟时间;同时,系统采用快速高精度指向算法,实现高精度的粗对准;使用复合光栅螺旋扫描方式和可对速度补偿的捕获算法,减少了捕获时间,提高了捕获概率。基于野外试验数据对捕获控制系统性能进行分析评估。结果表明,系统指向误差小于1°,捕获时间小于30s。目前,该系统已经研制完成并投入使用,效果良好。

In order to realize fast and high-probability acquisition, the acquisition control system of free space laser communication had been designed and constructed. It was composed of main control computer, GPS/INS prompt unite navigation system, numeral transmitter-receiver and control software. The operation system of main control computer was Windows CE. In order to reduce delay time of processing data, the control software adopted the technology of multithreading synchronization and event-driven mode to deal with the data of multi-serial ports at the same time. Fast and high-precision pointing arithmetic was applied to realize high-precision pointing of coarse tracking subsystem. Multiplex raster spiral method and acquisition arithmetic with speed compensation were used to reduce acquisition time and improve acquisition probability. Based on the examination data obtained in the field, the performance of acquisition system was analyzed. The result indicates that pointing error is less than 1°, acquisition time is less than 30 s. This system had been developed and put into operation. It has been proved effective.