多模GNSS同步兼容技術(shù)研究
[Abstract]:With the rapid development of GNSS (Global Navigation Satellite System), hundreds of navigation satellites will exist simultaneously over the world. Therefore, the compatibility synchronization between GNSS systems has gradually become a global problem. Aiming at the limitation of the GNSS system in the market, this paper studies the GNSS system under the new system. The GNSS system has the unique advantage of strong compatibility and excellent synchronization performance, and can select different synchronization schemes or a set of these synchronization schemes according to the different needs of users, in order to achieve the optimal synchronization effect. In recent years, multi-mode GNSS, which is derived from the concept of new system GNSS, has been proposed and has played an important role in compatible GNSS systems. In this paper, the mechanism of GNSS is studied firstly, and the importance of GNSS system is obtained. Then, the compatibility of multi-mode GNSS is studied, and the conclusion is that the multi-mode is mainly about the type of GNSS system in navigation system. The frequency band of the signal and the modulation mode of the signal are three aspects. On the basis of this research purpose, the time-domain, frequency-domain and related characteristics of GNSS signal are analyzed in detail, and the existing mainstream synchronization algorithms are introduced according to each characteristic, which lays the foundation for multi-mode GNSS synchronization compatibility. Then, the multi-mode GNSS compatible receiver control scheme is studied and designed. The scheme can achieve the different requirements of synchronization performance according to the different requirements of users through policy analysis and detailed planning of the implementation process. In order to solve the problem of resource redundancy caused by the mismatch between the GNSS system and the signal, the synchronization scene is matched one by one with the current mainstream synchronization methods studied in this paper, so that a single system can be compatible with multiple signals. Achieve synchronization process efficiency and synchronization results accuracy requirements. Finally, the problem of optimal synchronization for GNSS systems in different types, different signals and different frequency bands is solved to ensure that the GNSS signals under multi-mode conditions can achieve the requirements of synchronization. On this basis, the synchronization simulation is carried out with GPS,GALILEO and BDS as examples. The simulation results verify the reliability and accuracy of the synchronization compatibility scheme. Finally, the key module of synchronization is simulated and verified under the software radio platform of FPGA Power PC, and the analysis of time domain and frequency domain shows that the synchronization scheme can achieve the purpose of synchronization compatible reception.
【學(xué)位授予單位】:沈陽理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN967.1
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