Miniaturization and low-cost laser communication terminal is the development direction of space payload. MEMS fast steering mirrors (FSM) has the characteristics of small size, low power consumption, large deflection angle, high closed-loop control bandwidth and low cost. It is a potential fast steering mirror to realize the miniaturized laser communication terminal beam high-precision scanning and pointing, and is also one of the development directions of low SWaP-C laser communication terminal technology. For space laser communication terminal pointing acquisition and tracking (PAT) system, the optical and mechanical characteristics of MEMS fast steering mirror used in beam deflection mechanism are analyzed in combination with theory and engineering application. According to the quasi-static working mode of MEMS fast steering mirror for fine pointing assembly (FPA) and point ahead angle (PAA) mechanism and the resonant working mode for nutation coherent tracking mechanism, the static and dynamic plane types, working bandwidth and scanning angle, closed-loop control accuracy, volume, weight, power consumption and reliability requirements of MEMS fast steering mirror are analyzed in detail. The technical parameters of MEMS FSM for space laser communication are presented, which can provide reference for its application in space laser communication system.
Miniaturization is the development direction of space payload. In this paper, an integrated laser communication and lidar system is proposed. The laser communication and lidar share a hardware system, and the laser is modulated by BPSK, Chirp amplitude-modulated laser is used, and optical coherence zero-difference detection method is adopted to obtain the target range and velocity information, the composition and working principle of the system are introduced briefly, the laser communication link is analyzed, and the target detection performance under different conditions is studied. Theoretical analysis and simulation results show that the integrated scheme is feasible and effective, the communication rate can reach 2Gbps@(60000km,1E-7), and the effective detection range of space debris can reach more than 50km.
Optical antenna is an afocal telescope system which used to transmit or receive optical signals in free-space laser communication systems. In designing a high performance optical antenna, the challenging tasks including achieving of very compact and light weight optical configuration, appropriate exit pupil distance, high transmission efficiency, and wide temperature working range. The formulae of Gaussian parameters between the objective and eyepiece are derived by using the ideal imaging process. A first-order optics analysis of the optical antenna is given, which allows optics engineers to pre-define a suitable optical layout before performing design optimization and analysis. Design examples of off-axis reflective optical system are presented.
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