Monitoring of GNSS Positioning Accuracy in a Given Area

The method, methodology and algorithm for modeling one of the components of the satellite navigation signal monitoring system on the territory, dilution of precision, is given. The earth's surface is approximated by a grid whose nodes are given by latitude and longitude. At each point, dilution of precision is evaluated at the current time and presented as arrays of data and graphic images. The initial data for modeling and research is the almanac of GPS, GLONASS, GALILEO, BEIDOU, pseudoranges to navigation satellites. Dilution of precision is determined from the diagonal elements of the covariance matrix used to obtain the navigation solution. Dilution of precision can be obtained at a given time for any of the satellite systems or their combinations. There are graphical representation of some of the main results of the study.