Time synchronization in communication networks based on the Beidou foundation enhancement system

Abstract

Communication networks rely on time synchronization information generated by base station equipment (either the Global Navigation Satellite System receiver or rubidium atomic clock) to enable wireless networking and communications. Meanwhile, the time synchronization among base stations depends on the Network Time Protocol. With the development of mobile communication systems, the corresponding time synchronization accuracy has increased as well. In this case, the use of sparsely distributed-high-precision synchronization points to synchronize time for an entire network with high precision is a key problem and is the foundation of the enhanced network communication. The current receiver equipment for China's digital synchronous network typically includes dedicated multi-channel GPS receivers for communication; however, with the development of GPS by the USA, network security has been destabilized and reliability is low. Nonetheless, network time synchronization based on Beidou satellite navigation system timing devices is an inevitable development trend for China's digital communications network with the establishment of the independently developed BDS, especially the implementation and improvement of the Beidou foundation enhancement system. Beidou satellite navigation system precision timing, time synchronization, Beidou foundation enhancement system, communication network time synchronization Citation: Liu H, Zhang R F, Liu J N, et al. Time synchronization in communication networks based on the Beidou foundation enhancement system. Sci China Tech Sci, 2016, 59: 915,

Master stability functions for complete, intralayer, and interlayer synchronization in multiplex networks of coupled Rössler oscillators

“…(S10), (S9) and (S6), respectively) can be derived provided that the multiplex network has intra-layer topology that is identical on each layer and that both the intra-layer Laplacian matrix L L and the inter-layer Laplacian matrix L I can be diagonalizable and have real eigenvalues. There are important classes of real-world networks that fit this paradigm, such as the CORS geospatial information infrastructure [41][42][43] discussed in detail in the Supplementary Information.…”

Benefit of Sparse Reference Network in BDS Single Point Positioning with Single-Frequency Measurements

“…Currently, the BeiDou Foundation Enhancement System is composed of about 150 national frame-net base stations in China, all of which are homemade devices (). These are established through sparsely distributed BDS/GNSS satellite tracking stations, which help to correct the errors from atmosphere, space and other elements in satellite positioning (Liu et al, 2016). Compared with one station, the pseudorange corrections using a number of more nearby stations’ data for the rover station should further improve the accuracy of SPP.…”