GPS technology has improved operations in many industries including aviation, environmental sciences, marine, road and railroads, and surveying. Countless activities like the plowing of farm fields, banking and even the management of electricity power grids, are enhanced by the accurate information provided by GPS. Aircraft pilots, surveyors, boaters and countless others perform their work more efficiently and safely using GPS.
The GPS is a utility owned by the USA government focused on providing positioning, navigation and timing services to civilian as well as government, military and business users free of charge. Anyone with a GPS receiver can receive location and time information from the system. The system consists of three components.
Firstly, satellites orbiting the earth in low space. Secondly, control bases in various countries on earth. And finally, the individual GPS devices owned by millions of users. The satellites and control stations are operated day-to-day by the US Air Force.
The GPS started operation with 24 satellites but now has up to 32 in operation. The greater the number of satellites in operation the greater is the accuracy and reliability of the system. Each satellite is strategically positioned in low space about 12,000 miles above the surface of earth. They all move in a fixed, pre-determined orbit. At any instant in time, all areas on earth are capable of receiving signals 24x7x365 transmitted by multiple satellites.
Signal acquisition can sometimes be difficult for GPS receivers. Signal acquisition time can vary depending on the specific topographical and meteorological conditions surrounding a device. Highly sensitive antennas built-in to most GPS devices are designed to allow rapid signal acquisition even in heavily forested areas, thick cloud cover, stormy and overcast weather and so on. However, extreme topographical and meteorological conditions can delay or even prevent a device from receiving satellite signals at all (such as narrow, deep gorges).
Each satellite transmits radio microwaves one-way down to earth so as to blanket a large portion of its surface. Collectively, the full fleet of satellites ensures blanket coverage from 70 degrees north to south of the equator. Areas from the poles to 70 degrees latitude north and south are not serviced by the GPS system; they rely on a similar system operated by European governments.
At the push of a button, these specially-enabled GPS devices transmit their location coordinates, along with a personalized identification code, to the Search And Rescue Satellite Aided Tracking (SARSAT) satellites. This instantly alerts search and rescue (SAR) forces that the user needs emergency assistance. All of this happens within minutes. This GPS technology has greatly improved the safety of maany outdoor and extreme sports.
Look at this heart rate monitor watch. It?s pretty cool. The Garmin heart rate monitors that we have are worth every cent.
Source: http://communicationsarticles.info/2012/03/gps-technology-some-of-the-best-things-in-life-are-free/
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