Research On Precise Point Positioning Model Without Ionospheric Effect

GPS precise single point positioning technology is to use the precision ephemeris and satellite clock error provided by IGS,and the carrier phase and pseudorange data collected by a single GPS receiver are observed values,and the distance station method is used to determine the position of the station.GPS precise single Point positioning is also divided into static positioning and real-time positioning.The positioning accuracy is decimeter,centimeter and millimeter.In this paper,the precise single point positioning model and error correction model without ionospheric effects are studied,and a corresponding data processing program is written with MATLAB.The positioning accuracy of the model is verified and analyzed using the collected data.Work includes:Sliding Lagrangian interpolation method and Chebyshev fitting method are used to solve satellite coordinates and satellite clock errors at the corresponding epoch time.The interpolation precision and different orders of different order sliding Lagrange interpolation methods are analyzed in detail.The precision of Chebyshev fitting,so as to select an interpolation method suitable for precise single-point positioning model without ionospheric effects.The advantages and disadvantages of cycle slip detection and repair using MW combined method and ionosphere residual method were analyzed.In order to compensate for the shortcomings of the two methods in the detection of cycle slip,this paper proposes the use of combined MW combination and ionospheric residual method The detection and repair of hops and verification of the feasibility and reliability of the method are performed by a written program.For tropospheric delay errors,this paper compares the application of models,models,and models to correct tropospheric delay errors.By comparing the final selection model and projection function of this paper,tropospheric delay errors are corrected.In this paper,the receiver clock error is treated as white noise,and the validity of this method is verified by practical examples.In this paper,the error equation of the precise single-point positioning model without ionospheric effects is deduced in detail,and on the basis of the theoretical study of the precise single-point positioning model without ionospheric effects,a suitable application for static non-ionosphere effects is written on the MATLAB platform.Precise point positioning data processing program,through the collected data on the program was tested,and finally obtained the decimeter level positioning results.