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THE INFLUENCE OF A GEOMETRIC FACTOR ON A SATELLITE POSITIONING ACCURACY
Abstract
The influence of the geometry of the spatial resection - mutual positioning in the space of the receiver and satellites, signals from which the receiver is received at the time of measurement, on the positioning accuracy is considered. The position of the satellite is described through the geometric range, the direction angle and the elevation angle in a rectangular spatial coordinate system. The geometric factor is expressed through the diagonal elements of the inverse weight matrix of the position error determined point. The change in the geometric factor for symmetrical satellite layouts is investigated - with uniform location along the horizon and on the hemisphere. It is shown that as the elevation angle increases, the accuracy of determining elevation marks increases (VDOP decreases), and vice versa, the accuracy of determining the planned coordinates de-creases (HDOP grows). In this regard, it is suggested that when planning survey at observation stations and geopoligons, it is not to focus on PDOP, but separately on VDOP and HDOP.
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