The easiest way is differential GPS like surveyors use. Add an artificial reference satellite on ground with receiver and calculates errors between its known location and GPS location. This can do mm accuracy even with just civilian CA code.
GPS accuracy greatly improved when a new feature called WAAS (wide area agumentation system) was built in. It is used with GPS systems in the ground to make accuracy better by sending accuracy to a main station, which is then routed to your GPS.
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GPS
The WAAS systems improves the accuracy, integrity, and availability in a GPS system.The WAAS specification requires the system detect errors in the GPS
improved transaction speed and accuracy
No it does not. GPS satellites are geosynchronous, so they are in the same place 24 hours a day.
GPS readings are generally accurate within a range of 3-15 meters under normal circumstances. Factors such as satellite signal blockage, atmospheric conditions, and device limitations can affect the accuracy of GPS readings. However, advancements in technology have improved the accuracy of GPS readings in recent years.
Newer Garmin GPS receiver WAAS (Wide area augmentation system) capability can improve accuracy, averaging less than three meters. No additional equipment or fees to take advantage of WAAS. Users can also get a better differential GPS (DGPS), to correct an average of three to five meters accuracy of GPS signals within range. To get the corrected signal, users must be out by the differential GPS beacon receiver and beacon antenna. Now we use the following GPS receiver for our bus railway system.
DGPS is one of two widely used methods to augment the accuracy of the GPS. Most GPS chips will follow the NMEA standard so that is usually the preferred way of parsing both GPS and DGPS data. Check out the related links for a link to the NMEA GPS standard.
GPS uses a coordinate system called WGS84, which stands for World Geodetic System 1984. This system uses latitude and longitude coordinates to pinpoint locations on Earth with high accuracy.
GPS means Global Positioning System. This system includes 24 satellites that transmit microwave signals, allowing us to determine our location on the planet's surface with amazing accuracy. See link for details.
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