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DGPS Reference Station (choke ring antenna)A reference station calculates differential corrections for its own location and time. Users may be up to 200 nautical miles (370 km) from the station, however, and some of the compensated errors vary with space: specifically, satellite ephemeris errors and those introduced by ionospheric and tropospheric distortions.
The follow articles comprise the glossary of education-related terms: Glossary of education terms (A–C) Glossary of education terms (D–F) Glossary of education terms (G–L) Glossary of education terms (M–O) Glossary of education terms (P–R) Glossary of education terms (S) Glossary of education terms (T–Z)
In the 1990s, Differential GPS systems from the US Coast Guard, Federal Aviation Administration, and similar agencies in other countries began to broadcast local GPS corrections, reducing the effect of both SA degradation and atmospheric effects (that military receivers also corrected for). The U.S. military had also developed methods to ...
The US Nationwide Differential GPS System (NDGPS) was an augmentation system for users on U.S. land and waterways. It was replaced by [dubious – discuss] NASA's Global Differential GPS (GDGPS) system, which supports a wide range of GNSS networks beyond GPS. The same GDGPS system underlies WAAS and A-GNSS implementation in the US.
The goal of technology education is to spread technological literacy which is accomplished by bringing laboratory activities to students. The term "technology education" is frequently shortened to "tech ed". Technology Integration: A term used by educators to describe effective uses of technology by teachers and students in K-12 and university ...
DGPS also corrects for several other important sources of GPS errors, particularly ionospheric delay, so it continues to be widely used even though SA has been turned off. The ineffectiveness of SA in the face of widely available DGPS was a common argument for turning off SA, and this was finally done by order of President Clinton in 2000. [9]
The term "arts education" implies many things, but it is defined as: Instruction and programming in all arts disciplines—including but not limited to dance, music, visual art, theater, creative writing, media arts, history, criticism, and aesthetics. "Arts education" encompasses all the visual and performing arts delivered in a standards ...
The term digital anchor has been used to describe such dynamic positioning systems. [4]. The applications and availability depends on the type of work and water depth. The most common position reference systems (PRS) and position measuring systems (PME) are: GPS satellite in orbit. DGPS, Differential GPS. The position obtained by GPS is not ...