Research Of The Method Of Measurement And Calculation On The Deflection Of Vertical

The information of gravity deflection of the vertical is very important in defense technology,resource exploration and geodetic surveying.It is a difficult problem in the field of geodetic measurement that the measurement method of gravity perpendicular deviation can only achieve static measurement or dynamic measurement.In this paper,the measurement and estimation of the deflection of the vertical are studied in three aspects,such as the measuring method of vertical deviation based on the GPS/INS system,the measurement method based on the ZUPT and the method of estimating the vertical deviation based on the scalar gravity measurement.The main research work and research results are summarized as follows.(1)In this paper,the relationship between attitude error and deflection of the vertical in GPS/INS combination mode is studied,and the corresponding relationship model is established,and the estimation method of deflection of the vertical is studied based on the relationship mode.The deflection of the vertical is decomposed into medium and low frequency and high frequency.The low frequency part is calculated by the global gravity field model EGM2008,and the improved Gauss-Markov model is used to model the high frequency part.Finally,the RTS smoothing algorithm is adopted to realize the estimation of the high frequency disturbance part of the deflection of the vertical,and then add the high frequency part and the low-frequency part obtained by EGM2008 as the corresponding deflection of the vertical.(2)The application of ZUPT is studied in GPS/INS integrated navigation system.Based on the relationship between carrier attitude error and the deflection of the vertical,an improved method is used to estimate the deflection of the vertical.The simulation results show the validity and accuracy of the model.(3)In this paper,the method of estimating the deflection of the vertical based on airborne scalar gravity abnormaly data is studied.Analyzing the main reasons for the problem of downward extension of the air data.Based on regularized inverse poisson integral downward continuation method,the regularization solution parameter is introduced to improve the problem of downward continuation.EGM2008 is used to calculate the data of the corresponding area of gravity anomaly and the deflection of the vertical.Set the data as a benchmark.Regularization solution is used for data downward continuation calculation and then compared the data calculated with the benchmark to validate the feasibility and effectiveness of this method.(4)Based on the calculation method of the deflection of the vertical studied in this paper,the software for calculating the deflection of the vertical is designed by using the combination of C# and Matlab.The software platform can use three methods to calculate the deflection of the vertical expediently and instantly.The software application test shows that the software can meet the applicability and effectiveness.