Demanding for the closed communication among urban buildings, a solution for close range laser communication is proposed. The functional composition of the system is demonstrated and analyzed and the parameters of the system are reasonably allocated. The system design is used with independent optical aperture. The energy model under the inherent error of transceiver is analyzed and calculated. On the basis, the actual communication test was carried out, the specific test operation process is given and the measured data are obtained. The deviation between the average data and the theory is not more than 0.58dB. The correctness of the theoretical energy model is verified. The energy model can be used to guide the design of remote distance communication terminal. At the same time, the successfully development and communication test can be effectively accelerated the application of civil communication for urban buildings.
In order to analysis and design the Czerny-Turner structure spectrometer with the high resolution and high energy reception, various astigmatism methods of the Czerny-Turner structure are reported. According to the location of plane grating, the astigmatism correction methods are divided into two categories, one is the plane grating in divergent illumination, another is the plane grating in parallel illumination. Basing on the different methods, the anastigmatic principle and methods are analyzed, the merits and demerits of the above methods are summarized and evaluated. The theoretical foundation for design of broadband eliminating astigmatism Czerny-Turner spectrometer and the reference value for the further design work are laid by the summary and analyzing in this paper.
In order to break through the laser communication technology of one point to multipoint, which is the difficult problems for laser communication. The networking solutions of the antenna structure of three concentric spheres are proposed. Being with the advantages of simple structure, small size and light weight, the antenna structure of three concentric spheres can be applied to short-distance space laser communication. The feasibility of the system can be realized from two aspects, the analysis of link and the analysis of the precision index. On this basis, the whole optical system can be determined by the corresponding optical system design. Under the condition of permitting of link energy, the optical system of antenna structure of three concentric spheres with mobile field azimuth angle of 120°and the pitching angle of 20°is completed. The parameters can meet the requirements in the subsystem of the communication receiving optical path, the communication transmitting optical path and the communication tracking optical system. The results indicate that the antenna structure of three concentric spheres can be applied to the laser communication networking under the short-distance space.