The Global Positioning System involves the use of transmission of at least 4 radio wave signals from a "constellation" of 24 earth-orbiting satellites at one time.
A Global Positioning System (GPS) unit consists of a space segment, a control segment, and a user segment. The space segment is a constellation of two-dozen satellites orbiting the earth twice every 24 hours, at approximately 10,900 nautical miles above the earth's surface. The control segment is a series of monitoring stations located at different sites on earth. …
