Some Information about Global Positioning System of the XXI century
Today NAVSTAR GPS (Global Positioning System) is a well known reality that has already become a norm of life for a great number of people. This system gives a possibility to identify the location and velocity of the objects at any area on Earth, including polar areas, almost in all weather conditions, and in space to 100 kilometers above Earth. The United States Department of Defense has worked out and accomplished Global Positioning System.
The location is identified by the principle of measuring the distance from the point with the fixed coordinates to an object. The distance is defined by the counting the delay time of radio signal spreading from the satellite-transmitter to a GPS antenna which is a receiver. It signifies that to define 3-dimensional coordinates GPS receiver must know the distance to 3 transmitters and the time of the GPS system. And when we want to detect coordinates and altitude of GPS receiver we are to apply minimum 4 signals from 4 satellites. The direction of the transmitters from Earth is realized in the control station that is situated in Schriever base, Colorado.
Today GPS receivers are often applied for civil purposes, mostly for position and velocity detection. GPS devices are being traded in different stores and they are built in mobile phones, PCs and onboarders. GPS receiver allows a consumer to define geographical coordinates of the receiver's location at the present moment of time. The exactness of the location definition is from 3 to 5 meters and when radio signal is improved from Earth it becomes better and may be to one millimeter.
You may get GPS mapping software as well. This arrangement helps a consumer detect his location that is displayed on the electronic navigation map.
GPS electronic maps are divided into two kinds. Raster electronic maps are related to the first type of maps that are the simplest and the most open. This kind of maps is a simple image of the country where the coordinates of a receiver are used. There are used various scales but it mostly depends on the primary variant of a map. It can be either a photo from space or scanned version of a simple geographical map.
And vector electronic maps are created with their proper data system inside that makes them really useful. There are all information about surrounding objects, the place you are situated in and other useful data for a traveler. For example the country information includes the streams, lakes, mountains and other objects that are situated in this territory. These 2 kinds of maps include the info about all the hotels, motels, cafes and service stations in the area you are. So you can buy also portable automotive that will give you a convenience during the travel.
There are also some drawbacks that GPS has. The main shortcoming is that GPS is radio-navigation equipment and due to it signal would not be received in some conditions. A consumer will be practically imperceptible for GPS signal in reinforced concrete constructions. But anyway it is the greatest system of defining your location for today.
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