GPS for traffic conditions; How does it work?
GPS stands for Global Positioning System is a recent technology which was initially restricted to professional use before being made available to the general public.
GPS technology relies on the location (or position) of a GPS device from crossing triangulation) of data returned by 3 satellites. Each positioning updated in real time is very accurate as it can point a vehicle, boat or a device equipped with an ad hoc to 5 meters. This high precision positioning is involving in the case of a GPS road system maps for guidance in real time on-screen or voice depending on the model. The maps provided by operators are more or less detailed and sophisticated: for example add some simple maps of the "points of interest" which can be a service station, a school, hospital, etc. to better identify the one hand and provide more services in case of failure by example.
Other services may also be involved including the news that Traffic information in real time traffic conditions on roads used. This last option uses either the technology or the RDS TMC.
The positioning but also the card system and the Traffic info services are provided free of charge to owners of GPS devices.
Two major types of devices coexist on the market:
Dedicated devices: Called PND, these devices are designed and used exclusively for the GPS.
Advantages: They are dedicated; there is no problem of incompatibility. They are autonomous with a battery.
The disadvantages: Their prices for a single use only.
Tips: Some systems dedicated to hiking may include maps. These devices can be valuable for followers of routes outside the classical circuit of the city or main roads.
The aircraft "supporting" GPS:
These devices are PDAs or PDA (organizer) plus a specific card GPS, or mobile phones equipped with special software (type Smart phones).
Advantages: The price is much cheaper than a dedicated system because it includes features PDA or phone. Allow an average of € 400 for a PDA + map and an average of 500 € for a mobile phone.
Disadvantages: The generation of PDA, the 100% compatibility is not always there. In mobile phones models only the most technologically advanced (and therefore most expensive) are compatible. In practice, the system is dedicated much more comfortable.
The GPS competition
The GPS was developed by the Department of Defense and the U.S. is still dependent. If it is the largest satellite positioning system in the world, he is not alone. Indeed, Russia is using GLONASS and 2008; the European Union will launch its own system called Galileo.
Category:
Comments
Post new comment