Operation of a movable telephone GPS

Imagínate that you are leading to a work interview and gives account you of which you have yourself lost. Your first impulse probably is to call to the company that is going to interview and to ask to you for some indications to arrive. But you do not know very well where you are, can be something complicated to orient itself, even if they begin to give to advice and forms to you to arrive. Now supón that you use the telephone for another intention - to exactly know where you are and knowing how passage by step as to arrive at your destiny. The new telephones that include receivers GPS (Global Positioning System) can do that exactly. With the software or package of services indicated, to give to information of directions or places where you must arrive, it is much more simple and precise.
Combination of two technologies
A movable telephone is basically a sophisticated radio in two-way traffic. Towers and stations base formed on a network of cells, send and receive radio signals. The movable telephones contain transmitters of low power that allow them to communicate with the nearest tower.
According to you travel, you are moved from a cell to another one, and the station base monitors the force of your signal of telephone. According to you move one of these cells on the brink of madness, the power of the signal falls. At the same time, the station bases on the following cell to which you are approaching note as the signal is raising. According to you move of cell cell, the towers transfer your signal from one to another one.
In remote locations, the towers can be so distanced that they cannot signal consistent. Even when there are the towers very well, the high mountains and buildings can interrupt the signals. Some times people have enough problems in securing a good signal within the buildings, especially in elevators.
Even without a receiver GPS, your movable telephone she can provide information with your location. A computer can determine where you are being based on measures of your signal such as:

• The angle of approach to the towers in the cells.
• The time that takes the signal in traveling to multiple towers.
• The power of your signal when it arrives at a tower.

Ever since the obstacles as the trees and buildings can affect while the signal in arriving at a tower takes, this method usually is less precise that a measurement with GPS.
Basic concepts of receiver GPS
Like a movable telephone, a receiver GPS delegates in radio waveses. But instead of to use towers that are put in the ground, it communicates with satellites that orbit the Earth. There are at the moment about 27 satellites GPS in orbit - 24 in active state and 3 like backup in case some fails.
In order to determine your location, a receiver GPS must know:

• The location of at least three satellites over you.
• Where these in relation to the satellites.

The then receiver uses the trilateración to determine your exact location. Basically, it draws a sphere around each one of the three satellites that can locate. These three spheres intersection in two points - one in the space and another one in the ground. The point in the ground where the three spheres are intersectioned is where you are.
A receiver GPS needs to have a line clear to the satellite to be able to operate, reason why urban forests or centers can cause that it has problems in making a good location.
Telephones GPS
The integration of the movable telephones with technology GPS can come in two modalities. On the one hand the telephone can have a complete installed receiver GPS, or also it can be connected to one with cables or one connection bluetooth. These telephones with qualified GPS can understand programming languages like for example Java, and can serve us as street guide to arrive exactly at the point that we say to him. In order to use some of these functions, you need:

• A telephone with qualified GPS or a compatible receiver GPS.
• A call plan that supports to the transmission of maps and data GPS.
• A plan on watch or software that provides the up-to-date maps more, directions or information of the location of the telephone.

The uses most common in telephones GPS are:
Guide of direction - movable telephones GPS with qualified screens, can work like a traditional GPS showing us the exact way from a site another one in real time, and at the same time use the service of voice to indicate the details to us of our route. A data base that contains maps, normally updated of continuous form is used. Not only they even provide directions with directions in different cities or countries, but also similar routes of senderismo, montañismo and other activities.
Localizer - perhaps This it is a use that is not to the liking of all. Some industralists use this type of telephones to make a pursuit of their employees when company telephone occurs them. Many parents are also benefitting from this technology to know at any moment where are their children.