The effectiveness of global positioning system electronic navigation

Global Positioning System (GPS) is a worldwide radio-navigation system that consists of a constellation of twenty-four satellites located in six orbits, and their ground control stations. A unique device called the GPS receiver is responsible for the actual interface between the civil user and the global positioning system network. Global position system provides specially coded satellite signals that can be processed using a GPS receiver, enabling the receiver to compute position, velocity and time. Four GPS satellite signals are used to compute position in three dimensions (X, Y, and Z) and the time offset in the receiver clock. The position in the X, Y, and Z dimensions along with time are converted in the receiver to calculate geodetic latitude, longitude and height above the ellipsoid. Our research utilizes the earthmate high-performance GPS receiver, Ashtech G8 GPS receiver and a Sigtech Subaltto MC 500 GPS receiver. Our purpose is to test and evaluate the performance of the receivers to determine which gives more accurate position. In addition to position, we will determine the accuracy of the measurements computed by the receiver in comparison to those of a local area road map. This research focus towards implementing GPS into an indoor environment. With this research, we can determine which receiver(s) would be more effective for positioning, tracking, and navigation in a closed structure.