GPS navigation for today is a very common technology.
It is used in car navigators, smartphones and other portable devices.
The principle of operation of this technology is quite simple, but it requires appropriate infrastructure and services.
You will need
- - GPS-receiver.
Like many other technologies, GPS navigationWas developed for military purposes, and only then began to be introduced into everyday life. The work of this system is provided by 50 satellites located in the Earth's orbit, the first of which was launched in 1978. 30 of the 50 satellites are active and operate in a constant mode. For the smooth operation of the GPS system, its satellites must be updated every 10 years.
Each satellite of the GPS system flies around the Earth twicePer day, sending to its surface radio signals of low power. The GPS device captures this signal and measures the time it took for the signal to travel from the satellite to the receiver.
The orbits of the satellites are arranged so that in anyThe time point of the receiver can receive a signal from them. However, for accurate positioning, the receiver must be in the receiving zone of at least three of them. This is necessary to determine the latitude and longitude on the surface of the earth. To obtain information about the altitude at which the receiver is located, a signal from the 4th satellite is needed. The information received from the satellites is further compared with the map available on the GPS receiver.
Thus, the satellites and the receiver allowPrecisely determine the coordinates in space. To understand the actual location, the cartographic bases are used, which give names to settlements, roads, etc. The creation of such cards is handled by specialized companies, the accuracy of GPS receivers depends on their quality. There are many opinions as to which cards of their firms are better, but in reality it is a matter of personal preferences, because All of them provide quite accurate positioning.
To obtain clearer signals from satellitesIt is necessary that the receiver be in an open area under the open sky. Using a weak signal leads to the fact that interference for its passage can be the most insignificant, for example, a high-rise building, a mountain, a thick tree, even being in an enclosed space can worsen signal reception.