Today GPS (Global Positioning System) is a well known reality that has already become a standard of life for a great number of people. This arrangement is created for detecting the position and speed of the objects at any area on Earth. It can be done almost in any weather conditions and in all the areas on Earth including polar territory and in outer space to 100 kilometers above the planet. The developer of Global Positioning System is the United States Department of Defense that has realized the project.
The main principle of work is definition of the location by the method of measuring the distance to an object from the point with definite coordinates. The sending satellite spreads the signal to a GPS antenna and the delay time is calculated to detect the distance between the receiver and transmitter. 3-dimensional coordinates can be detected when GPS receiver will know the distance to 3 satellites and the time of the NAVSTAR GPS system. And when we want to detect coordinates and altitude of GPS receiver we have to apply minimum 4 signals from 4 transmitters. The direction of the transmitters from Earth is implemented in the control station that is located in Schriever base, Colorado.
A lot of civil people as well as the police, sailors and rescuers use GPS systems for various needs, mostly for navigation, location and speed definition. You may get GPS systems in different stores. Today it is usually built in cell telephones, personal computers and onboarders. GPS receiver gives you a possibility to detect geographical coordinates of the receiver's situation at the present moment of time. The exactness of the definition of the signal location is from three to five meters and it is really heightened with the correction radio signal from Earth and the calculating mistake is 1 millimeter.
Also a large amount of internet sites suggest GPS tracking software to purchase. This arrangement allows you to see your situation on the electronic map.
There are 2 types of maps. The first kind of raster electronic maps is the most available and the simplest type. Factually it is the picture of a country to which geographical coordinates are applied. The scale of such an electronic map depends on the primary version of it. This electronic map may be a simple picture from satellite or a scanned paper map.
Vector electronic maps, instead, are the maps with their own data base within. They have all the information about objects, their characteristics and location. The area information contains the data about the entire object starting from lakes and ending with hills that are situated in this area. These two types of electronic maps include the information about all the hotels, motels, cafes and filling stations in the area you are. You would receive a real comfort of a travel with the help of portable GPS.
But we are to say some words about the disadvantages of this product. The main shortcoming is that GPS is radio-navigation arrangement and owing to it signal would not be received in some conditions. A user will be almost invisible for GPS signal in reinforced concrete buildings. None the less it remains to be the best system of the position detecting for the present moment of time.
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