In the satellite to earth laser communication link, large-aperture ground laser communication terminals usually are used in order to realize the requirement of high rate and long distance communication and restrain the power fluctuation by atmospheric scintillation. With the increasing of the laser communication terminal caliber, the primary mirror weight should also be increased, and selfweight, thermal deformation and environment will affect the surface accuracy of the primary mirror surface. A high precision vehicular laser communication telescope unit with an effective aperture of 600mm was considered in this paper. The primary mirror is positioned with center hole, which back is supported by 9 floats and the side is supported by a mercury band. The secondary mirror adopts a spherical adjusting mechanism. Through simulation analysis, the system wave difference is better than λ/20 when the primary mirror is in different dip angle, which meets the requirements of laser communication.
A novel realization method of a high-precision and wide-range echo-laser simulator is presented according to the detection requirement for ranging performance measurement of some fire control equipment.The simulator is designed to achieve both high resolution precision and wide dynamic range, the method of time delay combined with counter method and time to amplitude conversion method is adopted, the first stage time delay adopts the counter method which use FPGA as the core device to enlarge the simulation range, the second stage delay adopts time to amplitude conversion method which use a ramp delay circuit as the core device to improve the resolution precision of the simulation. The method can realize echo laser simulation of 0.5m high-precision with 50m-2km wide range, the detailed design of each component of the laser echo simulator is also given in this paper. The experimental results show that the echo simulation accuracy of the simulator is better than 0.5m, meeting the detection requirement of laser ranger performance test.
An application example of precision photoelectric 2D-turntable for aiming device baseline variation detection is proposed in this paper, the optical measurement method is also expounded and the design scheme of automatic digital photoelectric 2D-turntable with high precision is supported. Because the supporting framework is the key component and the main bearing component of two-dimensional turntable, its strength and stiffness will directly affect the adjustment accuracy and stability property, the variable density topology optimization is applied to optimize the structure of supporting framework. The quality of supporting framework reduces by 20%, the displacement of the center of shafting mass under gravity loads is less than 0.05mm. The experimental results indicate that adjustment error of the photoelectric 2D-turntable is less than 0.05mil, repetitive positioning accuracy is more than 0.01mil which meets the design requirements of high precision adjustment accuracy or stability.
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