2/16/2023 0 Comments Garmin expert gps codeThe GPS industry is still very much in its childhood. The point at which the spheres intersect is the location. The receiver determines how long it takes the signal to get from space and then can determine a ÒsphereÓ where it is located. The GPS receiver takes this information and, making dozens of calculations per second, finds your position. This information is constantly updated and synchronized by land stations throughout the globe. The almanac data indicates where all the SVs are supposed to be in orbit at that given moment. This part of the signal is essential for determining a position. The ephemeris data contains information about the position of the satellite, along with the current date and time. The satellites (SVs) transmit a signal using their own unique ID code, ephemeris data and almanac data. They are solar powered and have a battery backup for the times when the sun is eclipsed. The satellites come equipped with an atomic clock, accurate to within 10-billionths of a second, and a radio transmitter of about 50 watts. Each satellite weighs about 2,000 pounds and is about 17 feet across with the solar panels extended. It took 16 years for the system to become fully operational with 24 satellites (and some back-ups). It was the first of four GPS satellites to be launched that year. 22, 1978, the first Navstar Global Positioning System satellite was launched from Vandenberg Air Force Base, California. After years of development and testing, GPS was born. In the height of the cold war, scientists were looking for a better and more precise way to guide ICBMs. In the 17th century accurate time keeping was added to the equation and navigation became more accurate but there was still a long way to go.įast forward to the 1960s. Bad ones, who got lost, were often executed. A good navigator who could get you within a few miles of your destination, was worth his weight in gold. Sailors guided themselves using a compass and the stars. In ancient times, navigation was a difficult and less than exact science. There are no fees associated with using the signal. A GPS receiver will show you your position, velocity, direction and time anywhere on the planet. The system is maintained by the US Department of Defense. In a nutshell, the Global Positioning System (GPS) is a space-based navigation system, consisting of 24 satellites orbiting about 11,000 miles above the earth.
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