Research Of New Synchronization Mechanism For New Satellite Navigation Signals

The satellite navigation system was the high precise aviation systems, which would realize global, all-weather, real-time, continuous navigation and positioning. The new generation signals were applied gradually in the satellites navigation system, in order to meet the need on the performance of anti-jamming, expansibility and adaptability. Accordingly, it was the emphasis problem that the research of synchronization methods on the new modulation signals, the new spread frequency spectrum signals, and the new frequency band signals.In this dissertation, on the foundation of analyze the research actuality and the development trend for acquisition and tracking based on navigation signals, the research was done thoroughly, which lay an emphasis on the new synchronization mechanism of new navigation signals. The followings were the main innovative works and research results.(1)A new high precision fast acquisition (HPFA) algorithm based on long period code was provided, according to the fast synchronization requirement of new mechanism navigation signals. The fast direct acquisition purpose was achieved by this new algorithm, and the new algorithm was better than XFAST algorithm and average algorithm in processing speed, the search scope, direct acquisition precision.(2)According to the difficulty of satellite navigation signal acquisition processing which was aroused by the new modulation technology, the three steps direct acquisition (3SDA) algorithm based on TDDM-BOC signal was provided, on the foundation of systematically analyze existing methods. The simulation experiment was done through correlation peak, acquisition efficiency, SNR limit and anti-jamming aspects, not only the reasonable and effective purpose was achieved, but also the data reversal position was accurately outputted.(3)An improved high efficiency tracking method based on BOC modulation signal was proposed, considering the error locked characteristic of DLL loop. Not only the purposes of main peak extracted and phase-locked were achieved, but also the carrier frequency was dynamically tracked, and the same time the data was accurately outputted by this method.(4) Considering the potential requirement for multi-mode synchronization receiving, three control methods were provided, which were method choice, flow choice and multi-threshold. On the foundation of synthetically consider the factors of synchronization processing speed, processing precision, resource utilization ratio and complexity degree etc, a configurable control scheme of multi-mode signal synchronization receiving was built.In the end, the research work was summarized, and the further research direction was given.