Research On Dynamic Measurement Verification Method Of GNSS Receiver Based On Fixed Track

At present,GNSS receiver measurement accuracy verification is mainly based on static measurement mode verification,but in practice,dynamic measurement and positioning are more widely used,and it is more necessary to ensure accuracy.To solve this problem,a receiver dynamic verification field is designed and established.The verification field includes a fixed track with straight lines and curves and four known coordinates around the track.Based on the above basic equipment,the main research contents and results are as follows:1)The basic theory of GNSS relative differential positioning is studied,the main errors in the measurement and positioning are analyzed,the basic theories of uncertainty and information entropy are introduced,and the minimum fuzzy entropy estimation model is introduced.2)The relationship between the absolute value of the plane measurement positioning residual and the fuzzy entropy score is verified,and the conclusion that the absolute value of the residual in the plane direction is positively correlated with the fuzzy entropy score is obtained.Based on this conclusion,the method of using the fuzzy entropy score to verify the positioning accuracy of the receiver plane measurement is proposed,and the results are compared with the internal and external compliance accuracy verification results of the plane measurement positioning results.The results show that the external and internal compliance accuracy of the three points in the plane direction is better than 3.3 mm and 1.8 mm,respectively.The average value of the limit difference fuzzy entropy is 0.3333,and the average value of the measurement positioning residual fuzzy entropy is less than 0.2251.The verification results show that the positioning accuracy of the receiver meets the specification requirements,which verifies the feasibility of the verification method.3)The system verification of the whole receiver is carried out,including the detection of the appearance of each component,the calibration of the base level,the calibration of the base optical pointer,the data transmission function,the ability to lock the satellite,the consistency of the antenna phase center of the receiver,the detection of the internal noise of the receiver,the residual accuracy of the dynamic measurement and positioning of the receiver,and the accuracy of the fuzzy entropy score of the dynamic measurement and positioning of the receiver.Considering the influence of temperature on the dynamic measurement and positioning results of the receiver,the repeated verification is carried out at 15? and 8? respectively.In the two experiments,the positioning accuracy of the slow mode and the fast mode in the plane direction is better than 18.6 mm,the external coincidence accuracy is better than 7.0 mm,and the fuzzy entropy score of the positioning residual is less than 0.3219.The verification results show that the receiver meets the requirements of dynamic positioning accuracy,and further proves that the verification method can realize the purpose of dynamic measurement accuracy verification of GNSS receiver.Figure 31;Table 21;Reference 59...