Experimental Study on PAT System for Long-Distance Laser Communications Between Fixed-Wing Aircrafts
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Free-space laser communication is characterized by high communication speed, strong anti-jamming ability, high confidentiality, and flexible configuration. In this paper, a pointing, acquisition, and tracking (PAT) system based on a two-stage (i.e., coarse and fine) composite tracking mechanism is proposed to solve the optical axis alignment problem, which is common in free-space laser communications. The acquisition probability of the PAT system is ensured by designing two tracking modules, a coarse tracking module which combines passive damping with active suppression and a fine tracking module based on an electromagnetic galvanometer. Both modules are combined by using a dynamic scanning mechanism based on the gyroscope signal. Finally, a free-space laser communication test with a long range and a high speed is conducted by two fixed-wing Y12 aircrafts equipped with the proposed PAT system. Experimental results show that the coarse tracking precision of the airborne PAT system is 10 μrad (1σ), and the fine tracking precision is 8 μrad (1σ) during flights which are much improved as compared with the indoor tests. This indicates that the system can achieve a high precision for PAT during high-speed and long-range laser communications in the free-space. This also verifies the tracking capability and the environmental adaptability of the proposed laser communication PAT system.
KeywordsPAT system laser communications airborne platform coarse tracking error fine tracking error
This project was supported by the National Natural Science Foundation of China (Grant No. 51505087). Also, we thank the Collaborative Innovation Center of High-End Equipment Manufacturing in Fujian Province of China for applying the experimental field.
- T. M. Fletcher, J. Cunningham, D. Baber, D. Wickholm, T. Goode, B. Gaughan, et al., “Observations of atmospheric effects for FALCON laser communication system flight test,” SPIE, 2011, 8038(1): 80380F-1–80380F-12.Google Scholar
- H. B. Huang, W. R. Jiang, Y. Ai, and T. Zuo, “Adopting gradient vector and particle filter in APT for space optical communication,” in Proceeding of First International Conference on Intelligent Networks and Intelligent Systems, Wuhan, China, 2008, pp. 301–304.Google Scholar
- D. Ruffner, “Optical forces in complex beams of light,” Ph.D. dissertation, New York University, New York, USA, 2015.Google Scholar
- A. Ashlaghi, “100 GBPS orthogonal frequency division multiplexing optical fiber communication network,” Master dissertation, California State University, California, USA, 2015.Google Scholar
- T. Luo and H. U. Yu, “Design and realization of laser beam acquisition, pointing and tracking of ground demonstration system for free space optical communication,” Journal of Applied Optics, 2002, 23(2): 14–17.Google Scholar
- J. Cunningham, D. Grinch, and D. Fisher, “Acquisition, pointing, and tracking architecture for laser communication,” U.S. Patent 7609972 B2, Oct. 27, 2009.Google Scholar
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