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gps handheld submeterThe GPS or Global Positioning System is a global navigation system used for military and civilian applications alike.
The US military has developed the ability to locally deny GPS (and other navigation services) to hostile forces in a specific area of crisis without affecting the rest of the world or its own military systems. Such Navigation Warfare uses techniques such as local jamming to replace the blunt, world-wide degradation of civilian GPS service that SA represented. In late 2005, the US government introduced the first in a series of new generation GPS staellites offering new capabilities. Chief among these is a second civilian GPS signal called L2C for greater accuracy and reliability. The author would have loved to have used GPS years ago in college. We had a class where we used maps and compasses. We were given precise coordinates and had to plot a course through woods and streams and swamps to find and sign in at specific latitude and longitude coordinates. Today, this sport, now called "geocaching", is a popular activity, particularly for outdoor hiking enthusiasts. GPS has become a vital global utility, indispensable for modern navigation on land, sea, and air around the world, as well as an important tool for map-making, and land surveying. GPS also provides an extremely precise time reference, required for telecommunications and some scientific research, including the study of earthquakes. Hand-held GPS units are often used by hikers and mountain climbers to plot their courses and to accurately reflect exactly where they are. The author once used GPS to organize a helicopter evacuation of an injured motorcycle rider in a remote region of the La Sal mountains in Utah. A reading was taken, coordinates given, and the pilot was able to find us with ease. Commercial civilian GPS receivers are purposefully less accurate than they might be. In specific, they are required to have limits on the velocities and altitudes at which they will report coordinates in order to prevent them from being used to create improvised missiles. In 1998, Vice President Al Gore announced plans to upgrade GPS with two new civilian signals for enhanced user accuracy and reliability, particularly with respect to aviation safety. GPS signals can also be affected by multipath reflections of the radio signals off the ground and/or surrounding structures (buildings, canyon walls, etc). For long delay multipath signals, the receiver itself can filter the signals out. A variety of receiver techniques, most notably Narrow Correlator spacing, have been developed to mitigate multipath errors. The GPS system uses a satellite constellation of 24 satellites in intermediate circular orbits. The orbits are designed so at least four satellites are always within line of sight from almost any place on earth. The constellation also includes three spare satellites in orbit. In 1985, ten experimental Block-I satellites were up. A complete "constellation" of 24 satellites was in orbit by January 17, 1994. GPS receivers come in a variety of consumer formats, and today can be found in cars, watches, phones boats and planes. Major manufacturers include Trimble, Garmin and Leica, low-end, hand-held consumer units are often available at less than $100 per unit. GPS derives in part from its predecssor, the LORAN navigation system. LORAN was designed for ship and airplane navigation in the 1940s for use during World War II. Most ships and airplanes are equipped with GPS systems so that they can accurately plot on a map where they are. In planes, this is especially useful during bad weather, and in ships in knowing where shallow water and other sunken obstacles may lie. GPS is coming into common use in cars these days. Most new cars allow you to purchase GPS technology that will help you plot your trip from one location to the next. Atomic clocks on the GPS satellites are set to "GPS time", which is the number of seconds since 00:00:00 UTC, January 6, 1980. UTC is short for Coordinated Universal Time. Today, GPS time is 14 seconds ahead of UTC, because it does not follow leap seconds. That's why new GPS units initially show the incorrect time after achieving a GPS lock for the first time. However, this is usually corrected on the display within 15 minutes once the UTC offset message is received for the first time.
1. Trimble - GeoXT Handheld
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The new GPS receiver has submeter DGPS capability with the internal L1 antenna. ... 29. Frontier Precision, Inc. - "Technology for information and ... A high performance, submeter GPS receiver combined with a rugged handheld computer, the GeoXT handheld is optimized to provide reliable, high-accuracy ... 30. DATASHEET GPS Pathfinder ProXH receiver or the GeoXH handheld. Postprocess real-time differential ... submeter 50 cm / centimeter. 3. GPS Pathfinder ProXH. submeter submeter / subfoot. 4 ... 31. Mulyana Jual GPS 081807480774. 02168923286 Trimble GeoXT The ... The GeoXH handheld is Trimble's top-of-the-line solution for high accuracy GIS data ... High-performance submeter GPS with integrated SBAS and EVEREST multipath rejection ... 32. Geo-Spatial Solutions (GSS) - Trimble GPS Hardware Sales Submeter GPS Accuracy & Mobile GIS. The Geocollector submeter is the essential tool for ... the GeoCollector handheld delivers consistent submeter real-time and ... 33. 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Fully integrated Bluetooth GPS receiver for submeter accuracy Purpose-built for GIS data collection, the GPS Pathfinder® ProXT receiver sets new stand ... 38. Jual : Gps Trimble Geo XT Handheld Murah. A high performance, submeter GPS receiver combined with a rugged handheld computer, the GeoXT handheld is optimized to provide reliable location ... 39. Trimble Equips Second Polish Government Agency with GPS ... The GeoXT combines submeter GPS technology with a rugged handheld computer running Microsoft Windows Mobile software. The GeoXT receiver allows ... } ?>
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