Bus Priority System Development Based On The Combination Of GPS And BDS

A country’s satellite positioning system is directly related to the territory of the country, national security and indirect impact on the economic development of the country, with the maturity and development of China’s Beidou satellite navigation and positioning technology, the Beidou system step by step in the construction of national defense information, National Geographic field conditions survey, land surveying, engineering and construction, Smart City has been widely used.In this paper, the global satellite navigation and positioning system (GNSS) in the field of intelligent transportation applications, for example, analyzes the current state of the art of urban intelligent transportation systems and shortcomings, and then the "Nanjing traffic signal priority control network and ground transportation systems." project background. Submeter background made based Compass+GPS pseudo-range differential positioning technology combined application of intelligent transportation. The main contents of the use of TCP/IP network data transmission protocol is based on VS2010platform C#language network data communication technology, data transport layer; multi-terminal, multi-threaded data parallel processing technology; compatible Compass extension RTCM3data transfer protocol, GNSS reference station data decoding technology; background BDS+GPS pseudo-range real-time differential positioning technology; communications terminals and servers decoding technology; data fusion technology.Currently GPS/BDS integrated positioning technology is still in an immature stage of the application for the BDS and GPS positioning method or using a similar approach, this study by RTCM3format data base station decodes the GPS reference station and the Big Dipper calendar, pseudorange, carrier terminal real-time observation data and upload GPGGA and pseudo-range observation data is decoded in real-time software in the background pseudorange differential analysis, to obtain positioning terminal differential positioning results. The results show that the software running real-time dynamic pseudo-range differential positioning accuracy of better than one meter in line outside in good observing conditions, the accuracy of1to2meters under normal circumstances.