|
Aviation & Flight InformationHow GPS Works
by:
Anne King
Worldwide Positioning System (GPS) is a direction aid originally developed for the military. The system just receives signals. It is the applied technology that gives the GPS its versatility.
If you have ever used map and compass, you wish understand a little just about how the GPS
works. In order to find your position on a map, you need to have three points of
reference. The across line from the reference points is wherever
you are. Map and
compass activity uses triangulation (bearings), GPS uses trilateration (distances) to calculate location. Satellites orbiting the earth emit unique signals that can be received by a GPS. The GPS code interprets the signal, characteristic the satellite that it came from, wherever
it was located, and the time that it took for the signal to reach the system. Once the receiver has several time and distance it begins to determine position.
Three satellites provide the intersection point and the fourth is used to check that the positioning is accurate. Accuracy depends upon the synchronization of atomic clocks in the satellites with the clock in the GPS system. Tho'
the clock in the GPS is not atomic, utilizing the fourth satellite gives it that practicality
as the internal clock adjusts itself to correct any discrepancy discovered.
GPS has gone far on the far side
its initial military application. Drivers can find their way
through city streets, long distance trekkers use the technology to cross strange terrain, mariners and pilots use GPS increased
data to cross the seas and skies.
In--vehicle GPS can be integrated into the car diversion system or can be installed as a removable device. These systems need to tell the driver wherever
he/she is and how to
reach their destination. The information includes road directions plus relevant features on
the way such as rest stops, gas stations, points of interest, etc. Automobile GPS uses voice commands so that the driver can concentrate on the road.
Hikers and trekkers use similar technology, but commonly without the inclusion of road
systems on their devices. Mapping code defines the territory that the footer wish
encounter. The user can enter waypoints (points of reference) so they can return mistreatment the same route. They can add points of interest such as water sources, possible campsites, and different items of interest on their trail. However, the movableness
demanded by hikers wish as well limit the practicality
of the system as small screens mean that several detail wish be lost.
It is GPS technology that is used to track individuals on house arrest, to trace missing
pets, taken
vehicles, and missing people. Small systems can be incorporated into pet
collars and wristwatches. As long as the receiver is active, it can be found.
Marine and aviation GPS units are sophisticated and specialized. The principles involved are the same as any standard system; the code is more much extremely
developed.
Any fisherman, who is mistreatment a fish finder on his boat, is mistreatment a GPS that is increased
by
sonar and chase devices. Units have been developed for use on float tubes as well -– as
GPS technology advances, the systems become more and more compact and their uses
more and more extensive.
If you are considering purchase
a GPS, do sure that it can be updated easily. This is especially true if you buy a multi--function GPS or one that is used wherever
conditions change regularly. An in--vehicle GPS before long loses its quality
if it is not updated as road systems change.
Updates vary according to the device being used. They can move in CD/DVD packages
or as computer downloads. The user can purchase maps specific to the area in which the GPS wish be used or a range of maps and routes. These are accessible from GPS code companies who wish charge proportionately
to the sophistication of the software.
GPS units vary in cost according to their usefulness. It is possible to buy units for less than one hundred dollars to units cost accounting
more than one thousand dollars. What your necessarily are wish be a factor in the cost of your unit. If you are a footer then movableness
is a major consideration. If you are a trucker, you need to be able to find a delivery point as quickly and handily
as possible. Some device you go for, cost is generally related to quality. Buy the better you can afford.
Just just about the author:
Anne King is a sports and recreation writer in Boise, Idaho. For more GPS information, visit Maps GPS Info.com which provides practical information on GPS and maps that everyone can use. The website includes product reviews and a maps/GPS glossary.
| |
