Assessment of the Location Determining Accuracy of the Drone in Difficult Conditions of Radio Visibility

The position accuracy of a subscriber by means of satellite navigation systems is studied in detail. However, little attention is paid to these issues in conditions of poor visibility of a navigation receiver. The article presents experimental results of the receiver localization by the GPS-GLONASS satellite constellation in conditions of considerable multipathing. The measurements were taken with a specially made experimental GPS-GLONASS receiver. These results have been analyzed using statistical methods. Such analysis permits exploring the influence of quantity and relative position of the satellites on the positional accuracy. The study justifies stricter requirements to the indices of the geometric dilution of precision, when selecting satellites in case of reduced visibility of the receiver.