A virtual reference station network covering a metropolitan area supplies position corrections to commuter buses equipped with a driver-assist system to enable safe operation, even under harsh weather ...
GPS is the modern answer to the ancient question about one’s place in the world yet it has its limitations. It depends on the time of flight of radio signals emitted by satellites twenty thousand ...
The U.S. Coast Guard (USCG) is working to provide Differential Global Po sitioning System (DGPS) service for harbor and harbor approach navigation by 1996. DGPS technology is the first to economically ...