Design Of Vehicle Terminal System Based On Integrated Positioning Of Satellite And Inertial Measurement

Vehicle terminal positioning mainly relies on Global Navigation Satellite System.At present,the global positioning system in the United States and Beidou Satellite Navigation System in China are widely used.Whether GPS or BDS can provide high-precision and long-term positioning information in the case of good satellite signals,but GNSS is strongly dependent on the external environment.In some common specific environments,such as high-rise buildings,viaducts,tunnels,underground garages,etc.,it is easy to cause insufficient visible stars due to the obstruction of satellite signals,or even lead to positioning failure.In contrast,Inertial Measurement Unit can calculate the attitude of the carrier without the aid of external information,and it has strong independence.However,due to the measurement error of inertial devices,this error will accumulate over time when it enters the positioning solution.The combined positioning system of GNSS and IMU can not only solve the positioning problem caused by the obstruction of satellite signals in a specific environment,but also effectively reduce the accumulated error of IMU.Therefore,the research and design of vehicle terminal system based on integrated positioning of satellite positioning and IMU is of great significance.Firstly,the satellite positioning technology and inertial measurement are elaborated,and the requirement analysis of the vehicle terminal system is given.Then the hardware design of the vehicle terminal based on the integrated positioning of satellite positioning and IMU is completed by using A9 G module as the terminal microprocessor.The integrated positioning successfully solves the positioning problem caused by the obstruction of the satellite signal in the specific environment.Moreover,A9 G module replaces MCU,network communication module and positioning module in traditional design scheme.It can not only ensure the integrity of vehicle terminal function,but also reduce costs,simplify the complexity of hardware circuit,shorten development time and minimize the size of vehicle terminal.Then the function realization of the vehicle terminal and the realization process of Kalman filter algorithm in the vehicle terminal are introduced in detail.Then the key functions and reliability of the vehicle terminal are tested and evaluated.Finally,this paper summarizes the relevant research content,discusses the shortcomings of this research work,and then,on the basis of the summary,the future work is prospected.