Study Of The Methods To Detect And Repair BDS Cycle Slip

Considering the factors such as national security and social and economic development,China has independently built the beidou satellite navigation system.The system operates independently,providing a full-day,all-day,high-precision positioning service.Unlike other satellite navigation systems,the beidou has a short message sending function.The establishment of beidou satellite navigation system is of great significance to China.The high precision positioning of beidou is mainly dependent on the carrier phase observation value,while the cycle slip is a problem frequently encountered in carrier phase positioning,which greatly reduces the positioning accuracy.This article first introduces the theory of beidou positioning and cycle slip problem,and then studied the beidou double frequency cycle slip detecting and repairing methods,analyzes the method in the detection of cycle slip effect under different sampling rate,On this basis,combining with the excellent characteristics of beidou three frequency according to the combination,the detection method of single and double frequency is applied to beidou three frequency of cycle slip detecting and repairing,and the three frequency ionosphere residual method are improved.The main research work is as follows,(1)Introduce the significance and development of the beidou navigation positioning system,the basic observation,the positioning error sources and cycle related issues such as definition,characteristic and influence on positioning accuracy,etc.(2)Study the high order difference method,polynomial fitting,the ionosphere residual method and carrier phase difference method,using the beidou satellite C01 carrier phase observation data are analyzed in the experiment,summarizes the characteristics of these methods in detecting cycle slip.(3)Study the characteristics of the three frequency carrier phase combination,use three frequency according to the formation of the cycle slip coefficient of three linear equation,while detect the combination of phase cycle slip,also can solve out each cycle slip on the band at the same time.The residual method of ionosphere is improved.It is proved that when the sampling interval is large,it can detect the cycle slip effectively.