Research And Implementation Of High-Precision Carrier Phase Positioning Technology

In the field of carrier-phase differential positioning,the traditional carrier-phase differential positioning method establishes a double-difference model between a single reference station and a user station for positioning.However,this method suffers from drawbacks such as low efficiency due to the need for a reference station and strong dependence of the user station on the reference station.To address these issues,this thesis proposes a solution using a dual-channel USRP B210 platform to build a dual-reference station system and carrier-phase differential positioning system,which helps achieve centimeter-level high-precision carrier-phase positioning in both static and dynamic scenarios.Based on GPS theory and carrier-phase differential positioning principles,this thesis studies and designs a carrier-phase differential positioning system based on USRP,and builds a GPS receiver system on the GNU Radio software platform according to the positioning scheme.This thesis also investigates cycle slip detection and repair solutions,improves the method of integer ambiguity resolution,and designs a dual-reference station system and differential positioning system.The positioning accuracy and stability of the system are verified in both static and dynamic scenarios.The main contributions of this thesis are summarized as follows:1.Study GPS-related principles and carrier-phase differential positioning theory,with a focus on the implementation principles of GPS receivers,carrier-phase differential positioning methods,sources of error,and further analysis of the improvement methods required for high-precision carrier-phase positioning,based on which the overall scheme of the carrier-phase differential positioning system is designed.2.Study the key theories required for implementing the differential positioning system,including the specific implementation of GPS receivers,improved cycle slip detection and repair solutions,and improved integer ambiguity resolution methods.The GPS receiver,cycle slip detection and repair,and integer ambiguity resolution are analyzed by MATLAB simulation.The simulation results show that the GPS receiver can quickly capture and track GPS satellites,the improved polynomial fitting method can effectively repair small cycle slips,and the improved LAMBDA method can obtain accurate baseline vector solutions.3.Implement the signal reception,capture,tracking,and navigation message decoding modules of the GPS receiver on the GNU Radio platform.Implement data processing software on the uplink machine at the dual-reference station end and positioning calculation software on the uplink machine at the user station end.Use the improved LAMBDA method to solve the baseline result and analyze the reliability of the positioning calculation software through GPS data calculation.4.Use USRP B210,GPS antenna,bias tee,and uplink machine hardware devices to build a dual-reference station system and carrier-phase differential positioning system.Design static and dynamic experimental scenarios to verify the effectiveness and time stability of the built carrier-phase positioning system through experimental testing results.