Some Facts about Global Positioning System of Today
GPS (Global Positioning System) is a navigation facilities that are really famous nowadays among various groups of society. The purpose of the system is the defining of the velocity and position of the objects. It may define the object at any place on Earth, even in polar territories and in space to one hundred kilometers above Earth in any weather conditions. The United States Department of Defense has developed and accomplished Global Positioning System.
The principle of the location definition is in measuring the distance from the point with the fixed coordinates to an object. The sending satellite spreads radio signal to a GPS antenna and the delay time is calculated to detect the distance between the receiver and transmitter. It signifies that to define 3-dimensional coordinates GPS receiver must identify the distance to 3 transmitters and the time of the GPS system. As a result, the signals from 4 satellites minimum are used for the definition of a receiver's coordinates and altitude. Schriever base, Colorado is the control station that implements the orbital force tracking from Earth.
GPS receivers are often used nowadays by civil people, sailors, rescuers and the police for location and speed definition of different objects. GPS systems are being traded in different shops and they are built in mobile phones, PCs and onboarders. A user may define his geographical location with the assistance of GPS receiver at any period of time that he needs. The greatest precision is from 3 to 5 meters and with the correction signal from Earth it is to 1 millimeter.
GPS mapping software is also suggested to consumers. Such system gives you an opportunity to define your geographical location on the electronic navigation map.
GPS electronic maps are divided into two kinds. The first type is raster electronic maps, the simplest and the most open ones. Actually it is the image of a country to which geographical coordinates are related. The initial variant of such a map will assign its scale. It may be both a photo from satellite and scanned paper map.
Vector maps, instead, are the maps with their own data system inside them. They have all useful information about objects, their characteristics and location. For example the country information consists of the rivers, lakes, mountains and other objects that are located in this territory. And of course, both raster and vector Global Positioning System maps would inform you about the hotels, cafes and restaurants, service stations around. Portable GPS systems is you advantage over usual paper maps.
But we have to tell you some words about the disadvantages of this product. The main shortcoming is that Global Positioning System is radio-navigation equipment and owing to it radio signal may not be received in some circumstances. A consumer will be almost imperceptible for GPS signal in reinforced concrete constructions. But today it really is the best system of the geographical coordinates detecting on Earth.
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