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Global Positioning Systems (GPS)
The Global Positioning System is a satellite-based navigational system that provides dependable time and location information of a receiver. Maintained by the U.S. government, it is originally intended for military applications and later made freely accessible for civilian use.
1,372 Questions
When were personal GPS units first sold and for how much?
The earliest personal GPS systems were handheld, and were capable of displaying the user's location on an electronic map. They were first sold around 1980, and there were more than 150 million turn-by-turn navigation systems worldwide in mid-2009.
Are there any cars that come standard with a GPS?
maybe soon ,here is the page i bought my car gps.
They have specilized in manufacturing auto parts for several years.the price is much reasonable than others,and also satisfing quality
Hope it may help U
How to choose a good GPS navigation system,where can I buy a good quality car gps at lower price?
Firstly, Determine how much you want to spend on in dash GPS system for your auto,
Secondly, List portable GPS navigation system features that you're seeking, like the United States map in details, voice guidance,
Thirdly, Visit as many online retailers or visit a few nearby stores as you want to look at the available GPS navigation systems
Forthly, A major drawback of the in dash GPS navigationsystem is the lack of an internal compass, accelerometer or a device used to measure the car's speed.
Is it possible to do car tracking on a stolen car?
Yes, they work with GPS technology. Basically they triangulate the location from GPS signal information relayed to hundreds of satellites. Then they alert the vehicle owner of the movement (for theft prevention, e.g.)
How many satellites does it take for GPS to find something?
Your receiver must pick up at least 4 to get an accurate 3D lock.
If your receiver can safely assume you are on or near surface of earth it can get a good 2D lock with just 3. This is usually a safe assumption to make, especially with civilian receivers.
Less than 3, all it can do is set its clock.
How can a gps system be blocked or jammed?
GPS signal jammers are portable devices that literally means gadgets that stop a GPS tracking device from receiving the signal that without which they cannot pick up their position. They emit their own signal at the frequency that GPS tracking devices use, which confuses or blocks other GPS signals.
How do global positioning systems work?
They calculate the time difference for signals from different satellites to reach the receiver.
The only thing your unit can tell from a single satellite is roughly
how far you are from that satellite.
But what you want is your location nailed down in 3 dimensions ...
where you are left/right, where you are forward/backward, and
where you are up/down. Your receiver calculates each of these
by comparing its distance from different satellites.
And if you want all three dimensions, then you need a minimum
of four (4) different satellites, not 3.
Can a gps work without a battery?
Le GPS d’un téléphone portable peut continuer à fonctionner même lorsque la batterie est épuisée, mais seulement dans certaines conditions.
Le GPS est un système de positionnement qui utilise des signaux émis par des satellites pour déterminer l’emplacement d’un appareil. Les signaux GPS sont captés par une antenne GPS intégrée dans le téléphone portable, qui est généralement distincte de l’antenne utilisée pour la communication sans fil.
Lorsque la batterie d’un téléphone portable est épuisée, cela signifie que l’alimentation électrique qui alimente le processeur et les autres composants du téléphone est interrompue. Cependant, si le téléphone portable dispose d’une fonction de localisation par GPS, l’antenne GPS peut continuer à fonctionner pendant un certain temps même après que la batterie est épuisée, à condition que l’appareil soit suffisamment proche d’un satellite
Cela dit, la durée pendant laquelle le GPS peut fonctionner sans alimentation de la batterie dépend de divers facteurs, tels que la qualité de l’antenne GPS, la force du signal satellite et la température environnante. En général, la durée de fonctionnement est assez limitée et il est recommandé de ne pas compter sur la fonction de localisation par GPS d’un téléphone portable épuisé pour des situations critiques ou d’urgence.
What are 2 health risks of using sat nav?
People tend to trust them too much, and stop thinking for themselves. Then if the sat nav fails for some reason(poor weather, overhanging trees, high buildings, old maps, temporarily rerouted roads or whatever) people get all upset and make a mess out of things.
Also, trying to set a destination while driving is distracting and dangerous if it's the driver doing it.
Gps is helpful because it helps you find location and where you are and Gps are known to be in cars.
It's all down to timing ! Ground stations 'decode' the amount of time it takes for a signal to 'bounce' from the satellite to the Earth. This pinpoints the location of each GPS satellite - and thus the necessary calculations produce the coordinates
How many people in the world use GPS?
Almost 17% of Americans own a GPS device, whether in their car or on their phone or other wise. An approximate number would be around 3,065,849 people, and the number continues to climb. (Maty 2013)
What is a reason to use a compass rather than a GPS?
To navigate your way if your in the middle of nowhere.
Is there a way to update the GPS map in garmin for free?
First, click on this link (from TomTom's support site) and follow the step-by-step instructions for installing TomTom Home software on your computer.
Your TomTom should have came with a USB cable that can attach to your computer. Use this cable to connect your TomTom to your computer, and then follow the instructions in this link to update the firmware (the software that is inside of the TomTom).
A Periscope is a type of observation material used during World War I. It is made up of two mirrors in parallel position with an angle of 45 degree placed inside a case. Periscope can also be seen on submarines and other military equipment.
Who was the originnal inventor of gps?
The GPS project was developed in 1973 to overcome the limitations of previous navigation systems,[1] integrating ideas from several predecessors, including a number of classified engineering design studies from the 1960s. GPS was created and realized by the U.S. Department of Defense (DoD) and was originally run with 24 satellites. It became fully operational in 1994. Bradford Parkinson, Roger L. Easton, and Ivan A. Getting are credited for inventing it.
What material was used in the making of the GPS?
GPS (and its equivalents) is a system, not a product. It means Global Positioning System, and consists of a constellation of 20-odd satellites (plus a few spares) and some ground stations to control them. GPS is the US originated system (and the original), and there are several others from different nations. These systems are based upon the ability to find a location by comparing radio waves from several different sources, and of having an exact knowledge of where these sources are. Your hand (or car) device is a complex computer that listens for the signals of several of these satellites, and from this data computing your location. You need at least four good quality signals to compute a location. Forest cover, canyons (including city streets), and other variables will degrade the signal. But you will still be given a number which may thus have a degree of uncertainty associated with it, but seldom is this qualification offered. Higher quality outdoor devices will indicate whether the satellites are at suitable azimuths, and of course, those used by surveyors have quite superior properties.
Everyone that uses any kind of GPS based device, in a car, most new phones, guided long-range missles, etc.
Does the GPS use sound waves or light waves?
There really isn't much of a connection between GPS (global positioning system) and sound waves. Sound waves are mechanical energy. They're pressure waves (force) that are transmitted into the medium through which they are going to travel. GPS is all about electromagnetic waves. And they can travel through the vacuum of space (as well as atmosphere, though with some scattering loss). GPS is a linked group of orbiting satellites that, for any given place and any given moment, form what may be referred to as a "constellation" (yes, just like the stars) overhead that can be used to locate a receiver on the earth. The satellites are always in motion and the constellations change, but the net result remains the same. At any time there will be enough of the birds somewhere overhead to talk to an individual receiver, and that receiver, based on the signals and the differential times at which they arrive, can calculate a geographic location. (There's a little whiz-bang processer inside that crunches all the numbers.) Need links? You got 'em.
Where can you purchase Garmin GPS navigation?
You can purchase a GPS navigation system in just about any electronics store, such as Best Buy or Radioshack, or in other stores such as Walmart. They can also be purchased from thousands of places online.
How can you explain global village?
it is based on the Medieval era that very few people left their own village and only with permission of the local Lord, know we live in one big village the world, only a few leave aka space and only leave the nation with permission aka passports.
Why is it necessary to have 3 satellites signals to determine elevation when using a gps receiver?
The receiver calculates the distance to each satellite from which it can receive a signal. The positions of the satellites are known, so with three known points (the satellite locations) there are two geometrically possible positions that are the correct distance from each one. With a fourth satellite and known point, there is only one position that is the correct distance from all of them.
Three points will always define a flat surface or plane between them, and for every location that is a given distance from each of the reference points, there will be another location on the other side of the plane that is the same distance away from each reference point - if you imagine the plane as a mirror, then the reflection of the first location is the second position. With a fourth reference point - as long as it is not on the same plane - there is no 'mirror' and thus no mirror position. As the GPS satellites are orbiting in ellipses around the Earth, it's impossible for four to be in the same plane, so this never arises...
