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Research on Anti-jamming Technologies of Satellite Tele-control and Tele-measure Communication

Author: WangLiSong
Tutor: LiangGuangMing
School: National University of Defense Science and Technology
Course: Electronics and Communication Engineering
Keywords: Satellite Control Anti-jamming communications DS / FH Hybrid Spread Spectrum Communication Interference suppression Interference modeling
CLC: TN927.2
Type: Master's thesis
Year: 2010
Downloads: 257
Quote: 2
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Abstract


Control is an important part of a satellite communication system, which guarantees the normal operation of satellite communications systems. How to improve the monitoring and control communication satellite monitoring anti-jamming capability to become hot areas of research and difficult problems. Based on the research in DS / FH spread hopping technology, based on the anti-jamming receivers for satellite monitoring key technologies, interference suppression techniques and strategies in-depth study and simulation. Paper work and complete the main achievements: 1, designed based on DS / FH interference receiver overall structure. In order to improve the anti-jamming performance monitoring receiver, papers in the narrative DS / FH Hybrid Spread Spectrum Receiver key technologies based on the proposed use of narrow-band interference suppression algorithm or strategy to achieve large adaptive filtering and interference suppression, thereby improving system The interference tolerance. This receiver structure constructed outside interference significantly inhibited the effect of the transmitted signal, effectively reducing the recovery information distortion. 2, the design and implementation of a long period spreading code sequence. Interference in spread spectrum communication system, a pseudo-random sequence plays a very important role. Pseudo-random performance quality is a critical issue, it is directly related to the overall system performance is good or bad. Based on the actual needs of project, constructed a clock frequency of 10.23MHz in the period more than one year when the long-period pseudo-random sequence code which has similar characteristics with the P-code, the period is longer than the P-code to meet satellite monitoring of the actual needs, and through simulation experiments, the various parameters have reached or even better than the P code. 3, on the Satellite Control channel interfering signals that may exist for the various types of modeling and simulation. Measurement and Control System platform interference produced by a variety of interference, the interference from different platforms on the impact of communication is not the same, in order to effectively carry out interference suppression, interference need to establish a suitable environment model. In this paper, in-depth study of the satellite monitoring communication transmission channel, based on a comprehensive analysis of the control command in the transmission process may encounter common types of interference, and on this basis to establish a mathematical model for all kinds of interference, and various types of interference model for the simulation analysis. 4, the programming of the adaptive transversal filter based on the LMS algorithm and windowed DFT-based domain filtering algorithm and transform algorithm based on FRFT, and conducted interference suppression performance simulation. For satellite monitoring common types of communications and broadband interference narrowband interference, this paper were used LMS algorithm, DFT algorithms and communication FRFT algorithm encountered interference interference suppression modeling and simulation, and the pulse broadband interference suppression strategy analyzed.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Satellite Communications and Space Communications > Satellite Communications
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