Lowrance GPS Methods for Usual Persons
Friday, June 20th, 2008
GPS (Global Positioning System) is a navigation facilities that are really famous today among various layers of society. This system gives a possibility to identify the position 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 realized NAVSTAR GPS.
The basic principle of functioning is identifying of the position by the means of measuring the distance to an object from the spot with definite coordinates. The transmitting satellite spreads the signal to a GPS antenna and the delay time is calculated to detect the distance between the receiver and transmitter. You may see that GPS receiver must know the distance to three satellites and the time of the GPS system to identify 3-D coordinates. And to define GPS receiver's coordinates and altitude it must use minimum 4 satellites' signals. The control over the satellites from Earth is implemented in the control station that is situated in Schriever base, Colorado.
Today GPS receivers are frequently used for civil purposes, mostly for position and speed detection. If you need handheld GPS systems you can purchase it almost everywhere today. It is also built in the most computers, mobile phones and onboarders. GPS receiver gives you a possibility to detect geographical coordinates of the receiver's location at the present moment of time. The accuracy of the location definition is from three to five meters and when radio signal is improved from Earth it becomes higher and can be to one millimeter.