Firstly, this paper introduces the hardware structure and measurement principle of the angle measurement system, and briefly describes the design of the optical amplification system. According to the working principle of the optical autocollimation and the two-dimensional PSD, a optical auto-collimation system is designed. Secondly, the application of auto-collimation principle in three dimensional angle measurement is introduced. Finally, based on the synthesis and decomposition of the spatial three dimensional angle, a three-dimensional angle measurement algorithm is proposed and taking the theoretical parameters as an example to analyze the theoretical error of the optical autocollimator system and the installation error of reflector. The focal length, resolution and magnification of the optical system are calculated based on the design objectives. On the basis of this, the optical devices are selected and the optical auto-collimation system is designed. Finally, the experimental results were analyzed by data obtained from several experiments, and a passive non-contact three-dimensional angle measurement method was proposed. The experimental results show that the proposed three-dimensional angle measuring instrument has the advantages of anti-interference and high precision, and its working accuracy is 0.23 arc seconds. The method is mainly applied in the narrow and strong electromagnetic interference three-dimensional angle measurement field, and it meets the requirements of stable and reliable, high precision and strong anti-interference ability of the three-dimensional angle measurement under the condition of small space. It solves the problem of three-dimensional angle measurement under small space conditions to a certain extent.
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