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无信标捕跟瞄技术以通信光为信标光,无需额外的信标光激光器,在重量和功耗受限的卫星光通信应用中更具优势。针对低轨小卫星平台星间光通信,对直接探测方式下的捕跟瞄链路进行功率预算分析,研究光通信终端的无信标捕跟瞄技术,设计捕跟瞄流程,并深入分析视轴抖动对捕获时间和捕获概率的影响,提出剩余不确定区域计算方法。结果表明:所设计的无信标捕跟瞄方法所需最大激光发射功率为0.135 W,捕获时间为30 s,捕获概率为95%,能够满足低轨星间光通信链路要求。
Beacon-less tracking technology aims at communicating light as beacon light without the need for additional beacon light lasers and has advantages in satellite optical communications applications where weight and power consumption are limited. Aiming at low-orbit small satellite platform inter-satellite optical communication, this paper analyzes the power budget of direct-target tracking-and-aiming links, studies the technology of beacon-free tracking and aiming of optical communication terminals, designs aiming and tracking process, Axis jitter on the capture time and capture probability, the calculation method of the remaining uncertain region is proposed. The results show that the maximum laser emission power of 0.135 W, the capture time of 30 s, and the capture probability of 95% can be achieved by the designed beacon-free tracking method. This method can meet the requirements of low-band inter-satellite optical communication links.