Differential GPS (DGPS): Increasing GPS Accuracy
What is Differential GPS (DGPS) and how does it improve GPS accuracy?
A) Measures ionospheric effects and updates GPS coordinates accordingly
B) Is a GPS system based on geostationary orbits
C) Is a system of reducing satellite signal interference
D) Utilizes the difference between a known position and measured position to increase the accuracy of GPS units
E) Cannot correct for selective availability
Answer:
Differential GPS (DGPS) is a system that utilizes the difference between a known position and measured position to increase the accuracy of GPS units.
Explanation: Differential GPS (DGPS) is a system that enhances the accuracy of GPS devices by utilizing reference stations to correct errors caused by various factors, such as atmospheric conditions and satellite orbits. By comparing the known position of these stations with the GPS coordinates received, DGPS can calculate and apply corrections to improve the accuracy of location information.
One of the key benefits of DGPS is its ability to mitigate ionospheric effects and minimize satellite signal interference, resulting in more reliable and precise GPS positioning. This is achieved by transmitting correction signals from the reference stations to DGPS receivers, allowing them to adjust their coordinates accordingly.
Overall, Differential GPS plays a crucial role in increasing the accuracy of GPS units, making it an essential technology for applications where precise positioning is required, such as in aviation, marine navigation, and surveying.