Yuan Hu

Reach on the measurement of the terminal performance of space laser communication system

Space laser communication system uses laser light as the information carrier to achieve intersatellite communication. And the terminal of laser communication is the key part. It is necessary to accomplish the test of performance and function, validation and judgment. The test of dynamic and static performance for terminal is the basic content and necessary steps on the reliability of space laser communication terminal. So the reach on ground test technology of space laser communication is more important. This paper mainly describes the test system of integrated performance for space laser communication terminal. The test range of system includes two essential parts, i.e, static test and dynamic test. Static test includes the angle of divergence, the coaxially of axis, communication performance and so on. Dynamic test includes the test of capture ability at dynamic and disturbance environment, and the test of dynamic track precision. The test system has achieved accurate test of dynamic track precision and multi-performances test of terminal based on simulatin at real working environment. The test result could present the anti-disturbance performance, anti-noise performance, and dynamic communication performance of the terminal.

Application of Dynamic Optical Theory in Zoom System

Dynamic optical is a theory which we can deduce the object-image conjugated rations of optical system by researching motion group in optical system. It can unify various formula and methods of optical system which have motion group. Zoom system is a typical dynamic optical system. This paper will discuss how to apply the dynamic optical theory to zoom system design. With dynamic optical theory, we can derive the image motion compensating formula and the trace curve of the image motion compensating group. The cam can be fabricated according to compensating curve, which can ensure the stabilization of image plane and keep imaging quality. Moreover, a example of 30× zoom system is presented, which proves that the dynamic optical theory has some practicability for zoom system design.

Study on the testing device of axis parallelism

Refer to the dynamic optics theory, there is no image deflection in the rotation process of right-angle-roof prism and rhombic prism around any axis in space. That is to say, after reflection, the output optical axis from the prism is parallel to the direction of the initial optical axis. The optical character of right-angle-roof prism and rhombic prism is applied in this paper. A new testing method of multi-axis parallelism with chain of combined multi-right-angle-roof prisms or multi-rhombic prisms is proposed. And the testing error is analyzed in detail.