Research On Dynamic Measurement Accuracy Verification System Of GNSS Receivers

With the continuous development of GNSS receiver technology,the calibration of receiver dynamic measurement performance is very critical to meet the user requirements for its reliability,and until now there is a lack of comprehensive research.Based on the above background,this paper discusses the composition of GNSS receiver dynamic measurement accuracy calibration system,and the construction of GNSS dynamic calibration field and writing the corresponding dynamic measurement data processing software.The research content and methods are as follows.1)Analysis of existing measurement-type receiver calibration protocols and a variety of calibration fields,design,and completion of the construction of a GNSS dynamic calibration field at the North China University of Technology,which consists of a mandatory observation pier,a fixed track plus a dynamic platform,and accuracy verification of the calibration field through experiments.The results show that the baseline standard deviation of ultra-short baseline field measurement composed of observation pier is ± 0.49 mm,and that of ultra-short baseline field measurement on dynamic platform is ± 0.30 mm,all of which are in line with the construction specifications of the calibration field and can be used to calibrate the dynamic measurement accuracy of multiple receivers simultaneously.2)Based on the basic theory of dual-system fusion dynamic positioning,this paper analyzes the differences between GPS and BDS systems in time and space references and the sources of various positioning errors,discusses the characteristics and countermeasures of related error sources,and the magnitude of the error interference studies the pseudo-range observation model and the carrier phase observation model of GPS/BDS combined positioning and discusses the construction of models such as the circumferential jump in the data processing.3)Using VS 2019 as the integrated development environment,c/c++ programming is adopted,MFC class library is used to generate a visual operation interface,writing dynamic measurement data processing software,and verifying accuracy of software solutions by using the measured data.The results show that under static measurement,the program solves the three points with an out-of-plane conformation accuracy better than4.0 mm,elevation is better than 17.4 mm,integrated external conformation positioning accuracy better than 18.0 mm,and integrated internal conformation accuracy better than4.5 mm.This verifies the accuracy and stability of the software solution results.4)Based on these two kinds of receivers,the internal noise detection,the consistency test of antenna phase center,and dynamic measurement accuracy-test were carried out.The results show that the internal noise check and antenna phase center consistency check of the two types of receivers are by the specifications,and in the dynamic measurement accuracy check experiment,the dynamic measurement plane positioning accuracy of the Huaxing A12 type receiver is ±6.9 mm,and the dynamic measurement plane positioning accuracy of the Haixingda i RTK2 type receiver is ±7.2mm,thus indicating that the dynamic check on the receiver can be carried out with the help of the check system.The final calibration report was generated for both receivers.Figure 29;Table 17;Reference 65...