Research On Application Of Global Navigation Satellite System Data Processing Software In Mountain Engineering Control Network

Since the 1970 s,the Global Positioning System(GPS)has gradually evolved into the Global Navigation Satellite System(GNSS).Its growth process is very rapid and its use is very extensive.Among them,for surveying and mapping,the GPS static measurement and real-time carrier phase difference(RTK)positioning system are particularly prominent.For GPS’s static relative positioning,high-precision GNSS data processing software has come out.For the static relative positioning of GPS,to improve the accuracy of GPS control network,in addition to program design and field implementation,internal data processing is particularly important,and baseline processing is the top priority in internal data processing.For the establishment of GPS control network and processing of static data,this study establishes a control network by selecting points with different side lengths and different topographic conditions,transforms different research areas,and performs static GPS observations on the control points selected in different research areas.The use of different GNSS data processing software at home and abroad for the baseline solution,analysis of the treatment process in the baseline solution to pay attention to.Previous studies have shown that most GNSS data processing software is only used to solve static data of their own products.One is that the software is not mature enough,and the second is that people are more difficult to operate,leading to slower baseline resolution and lower accuracy.Today’s GNSS data processing software is developing rapidly and supports the solution of multiple formats of data.In order to improve the time efficiency of GPS,the main contents of this study are divided into the following points: analysis of how to establish a suitable GPS control network for mountainous terrain;use different combinations of satellite height cutoff angles and epoch intervals to calculate baseline results After the analysis,a combination of high cut-off angle and epoch interval suitable for baseline processing is finally obtained;the data of different time periods are processed to analyze the influence of different observation time periods on the accuracy of the baseline resolution;by changing the known control points introduced Number and location of distribution,analysis of GPS network adjustment and the effect of the accuracy of the fitted altitude;analysis of the baseline solution accuracy and network adjustment and elevation fitting under two different satellite ephemeris calendars loaded with broadcast ephemeris and precise ephemeris data Accuracy.This article through the actual measurement data comprehensive calculation analysis verification,obtains the control network when laying the principle which should pay attention to;The observation period,the network the number of known points on the adjustment and the elevation fitting precision influence;Each commonly used GNSS data processing software processing The methods and characteristics lay the foundation for further improving the efficiency and accuracy of future geographic information work.