在卫星通信中引入激光通信可以带来增大链路带宽、降低卫星重量等多方面的优点。由于光波波长极短,因而用口径很小的天线系统即可使光波具有极强的方向性,带来了很大的天线增益,但同时目标点光束的覆盖范围也随之急剧减小,因而不能沿用微波卫星通信的PAT系统。文中对星间激光通信使用的PAT系统的原理及关键技术进行了研究讨论,其中重点讨论了通信光束的捕获问题。 The introduction of laser communications in satellite communications can bring many advantages such as increasing link bandwidth and reducing satellite weight. Due to the extremely short wavelength of the light wave, the antenna system with a small aperture can make the light wave have a strong directivity and bring a great antenna gain, but at the same time, the coverage of the target point beam also decreases sharply, thus Can not follow the microwave satellite communications PAT system. In this paper, the principles and key technologies of the PAT system used in inter-satellite laser communication are discussed and discussed, and the capture of communication beams is discussed.