详情

原文传递 The Global Positioning System: Assessing National Policies,

题名：	The Global Positioning System: Assessing National Policies,
作者：	Fossum, Donna;Frelinger, David;Lachow, Irving;Frost, Gerald;Pace, Scott;
关键词：	POLICIES, GLOBAL POSITIONING SYSTEM, FUNCTIONS, POSITION(LOCATION), AIR FORCE, DEPARTMENT OF DEFENSE, UNITED STATES, COMMERCE, SPACE SYSTEMS, RADIO BROADCASTING, AIR TRAFFIC CONTROL SYSTEMS, COSTS, NAVIGATION, SIGNALS, RADIO RECEIVERS, PRECISION, AMMUNITION, RESOURCES, GUIDANCE, RANGE(EXTREMES), TIME SIGNALS.
摘要：	The Global Positioning System (GPS) is a U.S. military space system operated by the U.S. Air Force. The space segment of GPS consists of a constellation of 24 satellites that broadcast precise time signals. When the satellites are in view of a suitable GPS receiver, these signals aid position-location, navigation, and precision timing. GPS was developed by the U.S. Department of Defense and deployed over two decades at a cost of over $10 billion. The U.S. armed forces are increasingly reliant on its signals for a variety of purposes from navigation to munitions guidance. However, over the past 10 years, GPS has evolved far beyond its military origins. It is now a worldwide information resource supporting a wide range of civil, scientific, and commercial functions, from air traffic control to the Internet. GPS has also spawned a substantial commercial industry in the United States and abroad with rapidly growing markets for related products and services.
总页数：	395
报告类型：	科技报告