What is Differential GPS (DGPS)?
Differential GPS allows the user to overcome the effect of SA interference, correct for other GPS errors and increase the overall accuracy of the GPS receiver. With DGPS, one GPS receiver is placed at a known location and the position information from that receiver is used to calculate corrections in the position data transmitted by the satellites. This corrected information is then transmitted to other GPS receivers in the area. The resulting real-time accuracy is in the 10-meter range. Sub-meter accuracy can be obtained by using DGPS and post-processing calculations in static positioning. A separate DGPS receiver is required.
Differential GPS (DGPS) Explained To make GPS even more accurate, the U.S. Coast Guard created a radio beacon system based upon differential GPS techniques. This system is a series of more than 60 ground-based stations that transmit a correction or differential signal on marine radio beacon frequencies. This signal can make a GPS receiver accurate from 1-3 meters by applying additional ‘corrections’ to the existing GPS signal. What effects the signal? There are hosts of natural and man-made interferences to the GPS signal. Basically, anything that will not allow the receiver to have a clear view of the sky will block the signal. This includes buildings, trees, mountains and the body of your car. This is why the receiver needs to be outside for optimum reception. The signal can be effected by water vapor in the upper atmosphere and even by the earth’s own sounds. How it works The GPS receiver will receive the signal and calculate your position with the standard method. At the same time,
