The Method Research And Program Realization Of GPS/BDS High Accuracy Afterward Dynamic Positioning

With the continuous development and mature of the Beidou navigation system,the use of Beidou satellite positioning has become one of the main ways of positioning at the moment,and has been widely used in the fields of national defense construction,engineering construction and urban transportation.At present,multi-system combination positioning is becoming one of the main trends of GNSS satellite navigation and positioning.GPS/BDS combination positioning is better than single system positioning to obtain more observation satellites,make better satellite layout,improve satellite positioning Accuracy.Real-time dynamic positioning(RTK)is an important positioning method for dynamic positioning.In the absence of real-time requirements,the collected experimental data can be brought back to the room for dynamic data processing.In this paper,the GPS/BDS combined post-processing dynamic positioning algorithm and program were studied in detail,focusing on the GPS/BDS system integration problem and the ambiguity of whole cycles solution method and strategy,and the use of self-programming on the measured data to understand and analyze.The main research work and conclusions are as follows:(1)This paper studies the GPS and BDS time system and coordinate system based on GPS and BDS satellite broadcast ephemeris,and research the function model of GPS/BDS combined relative positioning.Based on the combination of single and double differential mathematical models,Positioning errors exist for detailed analysis and correction.(2)Some basic methods and the solution of double difference ambiguity are analyzed.In the GPS/BDS combined dynamic positioning,the ion beam residual and M-W combination method are used to detect the cycle slip.The LAMBDA algorithm is used to solve the ambiguity and Kalman filter algorithm.(3)The software of GPS/BDS combined with dynamic data processing is developed by using the algorithm.The accuracy of positioning GPS/BDS system is higher than that of single system,and the data of GPS/BDS combination is dynamically analyzed.Accuracy of up to centimeters level,thus verifying the correctness of self programming.