Research On High-Precision Positioning Technology Based On Beidou

The Beidou satellite navigation system is an important construction project of China’s space power strategy,and it is also the basis for the construction of high-precision positioning services.The system is independently developed by Chinese researchers to provide navigation and positioning services for the Asia-Pacific region and even the world.With the development of navigation and positioning technology,there are new requirements for positioning accuracy.At present,high-precision positioning technology is mainly realized by the combination of satellite positioning and inertial navigation and positioning.The weakening of multipath errors in satellite positioning and the improvement of attitude calculation accuracy in inertial navigation and positioning are important research directions of high-precision positioning.In order to improve the positioning accuracy of the Beidou satellite system,the specific research contents of this dissertation are as follows:Aiming at the problem that Beidou multipath errors cannot be effectively weakened due to the characteristics of Beidou satellites,a multipath weakening method based on the periodic characteristics of Beidou satellites is proposed for the single-difference observation model.Firstly,the carrier phase double-difference positioning is used to remove some observation errors of the observation data,and the satellite period characteristics are obtained through the single-difference observations.The singledifference multipath model is extracted by the empirical wavelet transform(EWT)algorithm,and the errors are corrected according to the satellite period characteristics.The experimental simulation results verify the effectiveness of the method,improve the positioning accuracy,and reduce the interference of errors on the positioning.In the process of inertial navigation,in view of the problem that the high-frequency noise and drift error of the gyroscope lead to the decrease of the attitude measurement accuracy,an EWT algorithm is proposed to fuse the inertial sensor elements to calculate the attitude angle.Firstly,the hardware equipment is used to collect the attitude data of the object,and the PID control complementary filtering combined with the accelerometer data is used to reduce the drift error.The EWT algorithm combined with the wavelet soft threshold is used to remove the high frequency noise of the gyroscope,and the fourth-order Runge-Kutta method is used to solve the differential equation.Through the analysis of simulation experiments,it can be seen that compared with the traditional method,the improved algorithm improves the accuracy of attitude calculation.