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A Double-Focus Collimator System for Full PAT Performance Testing of Inter-Satellite Laser Communication Terminals

机译：一种双焦点准直仪系统，用于卫星间激光通信终端的全面PAT性能测试

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摘要

A laser collimator is necessary for the testing and verification of the PAT performance of inter-satellite laser communication terminals. However, the terminals mostly have a large field of view for the acquisition and a high angular accuracy for the fine tracking needed to be examined. A single collimator has the conflict to reach at both a large field of view and a fine resolution. To compromise, a double-focus laser collimator is proposed. The collimator is mainly composed of a primary lens, a beam splitter, a secondary lens and some reflectors. The primary lens with a 9.9m focal length directly forms the long focal length arm of the collimator. The combination of the primary lens and the secondary lens has a new focal length of 1.3m and constructs the short focal length arm of the collimator. With two CMOS imaging sensors, the collimator can realize a 1.1mrad field of view with a < 1μrad resolution in the focal plane of the long focal length arm and a 8.3mrad field of view with a 8.2μrad resolution in the focal plane of the short focal length arm. In combination with a coarse beam scanner (±15°) and a fine beam scanner (1mrad) to simulate the mutual angular movement between two satellites, the united system is capable to test the full PAT performance of inter-satellite laser communication terminals. The optical layouts of the collimator and two detecting units are illustrated. The optical design of the collimator is detailed. The mechanical design of the collimator is given.
机译：为了测试和验证卫星间激光通信终端的PAT性能，必须使用激光准直仪。然而，终端大多具有用于获取的大视场以及用于需要检查的精细跟踪的高角度精度。单个准直仪在大视野和高分辨率下都存在冲突。为了妥协，提出了一种双焦点激光准直仪。准直仪主要由一个主透镜，一个分束器，一个辅助透镜和一些反射镜组成。焦距为9.9m的主透镜直接构成准直仪的长焦距臂。主透镜和辅助透镜的组合具有1.3m的新焦距，并构成了准直仪的短焦距臂。借助两个CMOS成像传感器，准直仪可以在长焦距臂的焦平面上实现1.1mrad的视野，分辨率<1μrad，在短焦距臂的焦平面上实现8.3mrad视野，实现8.2μrad分辨率。焦距臂。结合使用粗光束扫描仪（±15°）和细光束扫描仪（1mrad）来模拟两个卫星之间的相互角运动，该联合系统能够测试卫星间激光通信终端的全部PAT性能。示出了准直仪和两个检测单元的光学布局。详细介绍了准直仪的光学设计。给出了准直器的机械设计。

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