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This resource, published by a commercial producer of GPS equipment, introduces students to the concept of Global Positioning Systems (GPS). Topics include how GPS works and how accurate it is. There is also a brief description of the satellite network that makes the system work, and some sources of error in the GPS signal.
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This guide shows teachers and students how to locate and view satellites in orbit. Topics include how to observe, some of the brighter objects such as the International Space Station and Space Shuttles, and how to use orbital tracking programs to identify which satellites are visible.
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This glossary provides definitions for terms used in Global Positioning Systems (GPS) technology.
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This glossary provides definitions for terms used in Global Positioning Systems (GPS) technology.
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This bibliography, intended for more advanced users, is a compilation of peer-reviewed articles published in 2006 describing original research with citations on Global Positioning Systems (GPS) and Global Satellite Navigation Systems (GNSS)
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This animation explains the code-phase and carrier-phase portions of the signal that is used for timing in Global Positioning Systems, and their uses. It is accompanied by a written explanation.
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This reference provides an overview of the United States Naval Observatory's (USNO) NAVSTAR Global Positioning System (GPS). Topics include GPS signal characteristics, selective availability, anti-spoofing, GPS system segments, GPS system time, and GPS time transfer.
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This virtual tour takes users across the Golden Gate Bridge. They can walk forwards or backwards, and look up or down and to the left or right. There is also a view from the top of the South Tower.
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This textual reference describes the history of seismographs, including how they work, as well as seismic waves, travel-time curves, and phase nomenclature.
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This frequently-asked-questions feature provides answers to common problems encountered when using the AS-1 seismometer and AmaSeis software. The AS-1 is the seismometer used in the 'Seismographs in Schools' program sponsored by the Incorporated Research Institutions for Seismology (IRIS).
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