Definitions for "Differential Correction"
Keywords:  gps, rtcm, accuracy, nearby, correct
a method of obtaining greatly enhanced precision from GPS navigation. Generally involves a correction signal transmitted from a reference GPS receiver, the exact location of which is known, (called the base station) to the GPS receiver being used to take measurements (called the 'rover')
A mathematical method of correcting inaccuracies in GPS data during post-processing. Differential correction compares the positions recorded by a mobile GPS unit with those taken at the same time at a nearby base station with a fixed location. The idea is that whatever variations occur in the signals received by the mobile device will also have occurred at the base station. Since the base station knows its exact position, any variances in the positions recorded by the base station can be reduced mathematically, or corrected. Whenever we apply this same correction to positions recorded at the same moment by a mobile GPS unit, we increase the accuracy of the position, often on the sub-meter level.
A technique used to improve GPS accuracy. Differential correction signals remove or reduce errors associated with atmospheric effects and other positioning errors. The correction signal can be land-based or satellite-based. Common sources of differential correction include WAAS, Omnistar, and Coast Guard Beacon.