Some Facts about GPS Systems of Today
NAVSTAR GPS (Global Positioning System) is a navigation facilities that are very popular nowadays among various classes of society. This arrangement is created for detecting the position and velocity of the objects at any place on Earth. It may be done almost in any weather conditions and in all the areas on Earth including polar area and in outer space to 100 kilometers above Earth. Global Positioning System was developed and accomplished by the United States Department of Defense.
The basic principle of work is identifying of the position by the means of measuring the distance to an object from the point with definite coordinates. The distance is counted by the delay time of the signal spreading from the sending satellite to the receiving of it by a GPS antenna. It means that to detect 3-dimensional coordinates GPS receiver must know the distance to three satellites and the time of the GPS system. As a result, the signals from 4 transmitters minimum are applied for the definition of GPS receiver's coordinates and altitude. The direction of the transmitters from Earth is realized in the control station that is situated in Schriever base, Colorado.
A great amount of usual persons as well as the police, sailors and rescuers apply GPS systems for different purposes, mostly for navigation, position and speed definition. If you need handheld GPS systems you may buy it almost anywhere nowadays. It is also built in the most personal computers, cellular telephones and onboarders. GPS receiver allows a consumer to define geographical coordinates of the receiver's position at the present moment. The accuracy of the situation detection is from 3 to 5 meters and when radio signal is corrected from Earth it becomes higher and may be to one millimeter.
You can buy GPS mapping software as well. This system helps a customer detect his location that is displayed on the electronic map.
There are two kinds of electronic maps. The first type is raster maps, the simplest and the most available ones. It is the image of a country where the position if the receiver is used. There are used different scales but it mostly depends on the primary variant of an electronic map. This electronic map may be a simple picture from space or a scanned geographical map.
But vector electronic maps have their own database within them. There are all information about surrounding objects, the territory you are located in and other helpful information for a traveler. The area information includes the data about the entire object starting from rivers and finishing with hills that are located in this territory. And of course, both raster and vector Global Positioning System maps will inform you about the motels, cafes and restaurants, filling stations around. You will receive a real comfort of a travel with the assistance of portable automotive.
But we have to tell you some words about the shortcomings of this product. As in any radio-navigation arrangement GPS signals would not come from the satellite to a receiver and visa versa due to diverse conditions. A consumer will be almost invisible for GPS signal in reinforced concrete constructions. But anyway it is the greatest system of defining your geographical coordinates for today.
This entry was posted on Friday, June 20th, 2008 at 10:57 pm and is filed under Science & Progress. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.
