Research And Implementation Of Satellite Positioning Error Correction System Based On Position Difference

With the development of global satellite navigation technology,there are more and more available positioning methods,while provide a basis for the accurate location services and the extraction of other relevant information by using the location information.However,due to affected by various deviations,the general positioning accuracy of 5-10(meters)level cannot meet the higher requirements for positioning accuracy of users.Adopting the pseudo range differential and carrier phase measurement can achieve a high positioning accuracy of meters and centimeters.However,since its high costs and complicated calculation,it cannot be popularized.Starting from the positioning module,data transmission,deviation calibration accuracy and the cost of use,it analyzes the source of position deviation,the correlation between the deviation and the positioning accuracy,and the method for correcting the deviation systematically.At last,it adopts the location difference to correct the satellite positioning deviation in order to achieve the(1-1.5)meter-level positioning accuracy by using the differential positioning,and provide a new idea for achieving the low-cost,dual-mode single-frequency positioning module to achieve meter-level positioning accuracy.The following content refers to the main work of the research:1)Expound the composition of the current main GPS/BDS global positioning system.The GPS and BDS positioning accuracy are affected by various deviations.Therefore,it analyzes and summarizes the above-mentioned deviation sources.Meanwhile,it corrects all deviations by adopting the differential positioning and expounds the positioning accuracy of three different differential positioning based on the experimental data.After the comprehensive comparison,it selects the location difference as the research basis to compare the practicability and accuracy of the other two differences.2)Analyze the positioning accuracy with or without position difference based on the experimental data of single-point positioning and location difference positioning in order to further prove the progress of location difference in positioning.It achieves the positioning on the basis of the location difference,and analyzes the specific factors affecting the location difference positioning.The main factors affecting the location difference correction deviation is the distance factor R between the two and the measured value of the receiver.It adopts the DOP weighted Kalman filter to improve the measured value of the receiver,and the multi-base station selection algorithm to correct the deviation for the mobile station of the nearest base station.The positioning accuracy of the mobile station has been increased by combining the two factors.3)Design the hardware and software of the system:the hardware adopts the low-cost dual-mode dual-frequency receivers,single-chip microcomputers,and GPRS modules for the building of base stations and mobile stations,while the software building a base station+mobile station+server system by adopting the remote server PHP programming background system and C language programming mobile station system.It achieves the systematical function of real-time positioning and real-time deviation correction.Meanwhile,it provides an application interface for users,which is finally integrated into a complete satellite positioning deviation correction plan.Based on the experimental data,it proves the reliability and accuracy of the location difference on correcting the satellite positioning deviation.