chartplotter gps
GPS navigation systems have come a long way
Jeff Sanders
Garmin GPS Navigation Systems
http://www.GpsFrontier.com
05/04/2009
GPS navigation systems have come a long way
GPS systems have come a long way since they were originally designed for the U.S. military. The first signal was a NAVSTAR received February 22, 1978. NAVSTAR 1 was launched from Vandenberg Air Force Base in California and was the first of 24 satellites that make up the positioning system (GPS). The first generation of satellites that comprise the global positioning system 24 satellites were launched between February 22, 1978 and October 9, 1985. Since it became operational on Global Positioning System has revolutionized the way America went to war and provides a gps system in which the world relies on for accurate navigation.
The Global Positioning System constellation of satellites in orbit is managed by the United States Air Force 50th Space Wing. The unit is the host wing at Schriever Air Force Base, located in eastern Colorado Springs, Colorado. They are responsible for monitoring and maintaining command and control, warning, navigation and satellite communications for Air Force Space Command, and the Global Positioning System. Full operational capability was declared in April 1995 by NAVSTAR (NAVSTAR is an acronym for Navigation Satellite Timing and Ranging, and is the official U.S. Government name given to the GPS satellite system).
The U.S. government granted the availability Global Positioning System for civilian use in the late 1980s and no subscription fees or setup charges to use the system GPS on the GPS civilian market has exploded, especially in the last decade. New generation of GPS satellites are sophisticated satellite replacement older and they are now 34 GPS satellites in orbit that provide combat capability for military and aid to air navigation. Applications Civilian include ATM banking and securities trading and management of grid. Currently, 31 of the 34 orbiting GPS satellites transmit signals navigation and timing for the civil and military users worldwide.
GPS for civilian use
System Civilian GPS has not always been as it is today and the U.S. military is still conducting the most accurate available Global Positioning Systems classified for national security. But GPS updates for the two new civil signals to the user's accuracy and reliability, especially as regards air safety have been planned in 1998. Then, May 2, 2000 "Selective Availability" was discontinued following the 1996 Ordinance on management, allowing users to receive a GPS signal not degraded in the world, and in 2004, Qualcomm announced successful tests of Assisted GPS for mobile phones that have led the way for assisted GPS phones by the cell that are widely used today.
In 2005, the first third-generation GPS satellite was launched and began transmitting a second signal Civilian improved user performance. Then, in September 2007, the Air Force completed a four-stage transition of the Global Positioning Systems segment soil of its new Architecture Evolution Plan. The ground segment of the provision of command and control of satellites and generates the navigation message for satellites broadcast GPS users to calculate the position of their land. The new GPS satellites include new high-powered, military anti-jam code, with the precision of others reliability and improved data integrity for civil and military users. This modernized version of the world's largest utility Free was designed to ensure the U.S. has the most accurate positioning and safe navigation and the ability to schedule until 2030.
Europe and Russia to develop their own GPS
In 2004, the United States signed an agreement with the European Community establishing cooperation with the European Galileo system planned. Galileo is a Global Navigation Satellite System (GNSS), which is being built by the European Union and it is independent but complementary to the U.S. Global Positioning System. The European Galileo system should be operational in 2013. The European Community's political objective is to provide an independent GPS that European nations can rely on in time of war or political disagreement, because the use of both Russia and the United States could disable their national systems by other (For encryption).
The Russian GLONASS GPS is a satellite based radio navigation that has been developed by the former Union Soviet and now operated for the Russian government by the Russian Space Forces. As the European GPS system GPS works in the Russian system as separate but is free to the U.S. Global Positioning System. Russia began launching satellites for GPS in space October 12 1982 and was completed in 1995. The system rapidly fell into disuse aside the collapse of the Russian economy, but in 2001, The Russian government has begun to restore the system in hopes of restoring global coverage by the end of 2009.
Systems GPS today
According to the GPS device with a GPS receiver requires only one signal three to four satellites to calculate the units of measure and work in all weather, anywhere in the world, 24 hours a day. There are no subscription fees or installation costs, as with a cell phone to operate GPS receivers and GPS receivers, although some have additional features such as update real-time traffic with a monthly subscription, Garmin Nuvi Some receivers as "T" series come with real-time traffic for lifetime of the device. Today GPS is extremely accurate thanks to their design multi-channel parallel. Garmin's 12 receivers parallel channels are very quick to lock onto the satellites in the first step and they maintain strong locks, even in dense foliage or city with tall buildings, because they constantly monitor the signals of 12 satellites at any time. Even if a 12 parallel channel receiver loses the satellite signal 8 simultaneously it will always work correctly.
WAAS (Wide Area Augmentation System) was developed by the Federal Aviation Administration to increase the global positioning system to improve the accuracy, integrity and availability. WAAS was originally intended to allow aircraft to rely on GPS for all phases of flight, including precision approach to the airport in its coverage area. All albeit Originally intended for aviation most GPS receivers today are WAAS including automotive, navigation plotters craft and labor units. WAAS uses a network of ground stations reference function in North America and Hawaii, to measure small changes in the signals from GPS satellites. The measurements from these reference stations are routed to the station master, then they send messages to WAAS satellite correction GEO. These satellites then broadcast the correction messages to Earth, where WAAS GPS receivers use the correction data for the calculation of their positions to improve accuracy. WAAS-enabled GPS receivers are accurate to within 3 meters and are therefore more accurate GPS receivers for use Civil on the market today. In fact, a WAAS GPS receiver can even give you directions to the path of your car rolls in (as the program Mapping supports "Lane Assist" directions) and no additional hardware or costs required to take advantage of WAAS GPS receivers, they are also becoming common as cell phones.
About the Author
Jeff Sanders
Garmin GPS Navigation Systems
www.GpsFrontier.com
04/05/09
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