Recent developments in optical communication systems have presented an emerging need for scanning and tracking dynamic targets with high accuracy. Unfortunately, conventional scanners have difficulty supplying either sufficient vision information or high scanning resolution because of the fixed optical parameters and optomechanical structure. This paper introduces a novel cascaded double-prism scanner that combines the two scanning modes of rotating and titling motions into a nested device. The analysis results show that both the vertical field angle range and the horizontal field range of the coarse scanning are no less than ±10°, with the scanning accuracy superior to 50 μrad, while the vertical field angle range and the horizontal field range of the fine scanning are, respectively, no less than 2500 μrad and 1200 μrad, with the scanning accuracy superior to 1 μrad. The scanning method not only meets the requirements of collaboratively steering the beam deviation in a large range with high accuracy but also can obtain a variety of scanning modes and trajectories, which has important engineering significance for the solution of steering a fine beam to track and position a dynamical target.

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The laser tracking measurement for space moving targets is the research hotspot in the precision measurement field, which has attracted many researchers' interests for many years. The tracking mechanism characterized with the performance of high accuracy and rapid response is the key to solving the dynamic measurement problem. In the paper, a project with one prism rotating around the rotating axis to attain the linear tracking is proposed, which can not only meet the requirements of the large range, rapid response and dynamic tracking, but also achieve the high accuracy of submicroradian magnitude due to the particular opto-mechanical design. Steering the tracking mechanism can well track the linear motion of space dynamic or static target. In order to study the above system, the technical parameters of the mechanism are firstly designed, and then the model analysis and simulation calculation is respectively carried out. Therefore, a new measurement is finally brought about, which points outs a solution for the measurement of space moving target with large range and high accuracy. The design results show the tracking accuracy is better than 0.5 µrad within the tracking angle range.

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