Abstract
Position on the planet has always been vitally important to human beings and today our exact position is something that we can obtain with ease. Among the most stunning technological developments in recent years have been the immense advances in the realm of satellite navigation or Global Navigation Satellite Systems (GNSS) technologies. There are various causes of measurement error. The precision of positioning with GPS navigation depends on the one hand on the precision of the individual pseudorange measurements and on the other hand on the geometric configuration of the satellites used. In order to achieve an accuracy of one meter or better, additional measures are necessary. Reducing the effect of measurement errors can considerably increase the positioning accuracy. Differential GPS (DGPS) is a method for reducing the measurement error of GNNS.
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