High Precision Positioning System Based On Carrier Phase Difference Technology Research And Implementation

High-precision positioning technology has now become an important research direction of satellite navigation technology.It plays a very important role in the fields of map surveying and mapping,science and technology agriculture,national defense construction,and autonomous driving.The degree of development of high-precision positioning technology is even directly related to certain industries.Can you enter the core technology of the next stage.Satellite navigation and positioning technology has been used globally for many years,but ordinary navigation receivers can only provide meter-level positioning services,which cannot meet the current demand for high-precision positioning technology.The development of high-precision positioning technology will promote the further development of multiple industries in the future.This article first introduces the traditional remote principle of satellite navigation and positioning and the satellite navigation and positioning system is mainly composed of radio frequency receiving module,ground monitoring part and user receiving equipment.The common sources of errors in satellite positioning:clock errors,relativistic errors,ephemeris errors,ionospheric errors,tropospheric errors,multipath errors,and antenna center phase errors,and common correction methods are introduced.Carrier phase differential positioning technology can eliminate errors by differing from the reference station,and calculate positioning coordinates by using carrier phase,with an accuracy of centimeters.The calculation of the ambiguity in the carrier phase differential positioning will directly determine the final settlement accuracy.The solution of the ambiguity in the whole cycle is divided into two methods:search-based and non-search-based.The commonly used search-based settlement methods include ambiguity in the observation domain.Degree search,ambiguity search in the coordinate domain and ambiguity search in the ambiguity domain.The ambiguity domain is divided into Bayesian and Non-Bayesian estimation methods.This paper adopts the non-Bayesian-based LAMBDA solution method,analyzes the common cycle slip problems in carrier phase difference,and proposes the processing method of cycle slip.Carrier phase differential positioning technology has also been continuously developed this year.Currently,there are commonly used carrier phase single-difference models,carrier phase double-difference models and carrier phase triple-difference models.This paper has carried out simulation verification based on carrier phase double-difference models.At the same time,in order to solve the problem that the positioning error will gradually increase due to the weakening of the unit vector correlation between the user station and the reference station as the baseline increases in the carrier phase differential positioning,this paper proposes to use the traditional positioning coordinates obtained by the navigation and positioning module as the rough coordinates.The method of compensation can ensure that even if the baseline keeps getting larger,the error can be kept within a certain range,which can better meet the demand for high-precision positioning.It is verified by MATLAB simulation,and the positioning result of the approximate coordinate correction is added,which can meet the positioning requirements of centimeter level.