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Physical Basis and Corresponding Instruments for PAT Performance Testing of Inter-Satellite Laser Communication Terminals

机译：卫星间激光通信终端PAT性能测试的物理基础和相应的仪器

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The propagation of laser beam in inter-satellite laser communications belongs to the far-field diffraction, but in the optical test and verification of pointing, acquisition and tracking (PAT) function on the laboratory the beam from a terminal propagates within the near-field. In this paper, in terms of the Fresnel diffraction theory the inherent difference is found that in the far-field diffraction the optical tracking position error is resulted from both the mutual movement between two laser communication terminals and the tilting of the receiver terminal, but the tilting of the transmitter has no effect on the error position; and that in the near-field diffraction the position error is caused by the tilting of the transmitter or the receiver, but the mutual movement has no effect. It is furthermore found that the use of a beam scanner in the test in the near-field can simulate exactly the mutual movement of satellites in the far-field, and the trajectory formula for the beam scanning is deduced that is the same as the mutual angular trajectory from one satellite to another. Therefore a practical PAT test bed of a double-focus laser collimator, a beam scanner and a fine beam steering device is developed by us to test and verify the PAT function of inter-satellite laser communication terminals. The optical aperture is about φ440mm for this use. And a test bed for concurrent test and verification of both PAT function and communication performance is also demonstrated. The test bed consists of a conventional laser collimator, an optical scanner and a far-field beam transmission simulator, which is a combination of a Fourier-transform lens an a followed multiple-stage imaging amplifier. The details of configurations are given. It is clear that these test beds can be also used to test and verify the functions of laser radar, passive optical tracker, and so on.
机译：卫星间激光通信中激光束的传播属于远场衍射，但是在实验室的指向，采集和跟踪（PAT）功能的光学测试和验证中，来自终端的光束在近场内传播。在本文中，根据菲涅耳衍射理论，发现了固有的差异，即在远场衍射中，光学跟踪位置误差是由两个激光通信终端之间的相互运动以及接收器终端的倾斜引起的，但是变送器的倾斜对错误位置没有影响；并且在近场衍射中，位置误差是由发射器或接收器的倾斜引起的，但是相互运动没有影响。进一步发现，在近场测试中使用光束扫描仪可以精确模拟远场中卫星的相互运动，推导出光束扫描的轨迹公式与相互之间的相同。从一颗卫星到另一颗卫星的角度轨迹。因此，我们开发了实用的双焦点激光准直仪，光束扫描仪和精细光束转向装置的PAT测试台，以测试和验证卫星间激光通信终端的PAT功能。光学孔径约为φ440mm。并演示了用于同时测试和验证PAT功能和通信性能的测试平台。测试台由传统的激光准直仪，光学扫描仪和远场光束传输模拟器组成，后者是傅立叶变换透镜和随后的多级成像放大器的组合。给出了配置的详细信息。显然，这些测试台还可用于测试和验证激光雷达，无源光学跟踪器等的功能。

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