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What is GPS? You’ll be surprised HOW IT WORKS

Posted by map on February 9th, 2010

Author: KALP SYSTEM (530)50
Modified on 17/01/2009

Much talk in the day to day GPS navigators. We took in the car or pocket, some even on a clock and not even know it. But what these acronyms mean? Where do they come? I will try to tell you the clearest possible way the origin, meaning, operation and types of GPS navigators that we find today. WHAT IS THE GPS The Global Position System (GPS) or Global Positioning System (its correct name is NAVSTAR-GPS1) is a Global Navigation Satellite System that enables us in the place we’re in the world (is worldwide, unlike the Russian system GLONASS) to determine our position or that of an object to within a few meters, but could be improved. This technology has its origin and development in the military. Specifically, is currently responsible for the Department of Defense of the USA. In the next version, GPS III, will be a branch that is not dependent on the military field. HOW IT WORKS Although one might think the GPS device is placed in the car, the reality is that this element is only one part, namely one third of the entire system. What we have between the hands is only the receiver. For this element we need to be of some satellites, 27 in total, which orbit the Earth. These teams have a lifespan of about 8 years, after which generally are replaced with more modern ones. Power is receiving solar cells. The satellites circle the Earth and their orbits are calculated so that at any time and from anywhere on Earth have at least six satellites are visible by our receiver. That everything happens as planned in charge of monitoring stations that synchronize the atomic clocks of the satellites and alter the trajectory and orbit. These data will be crucial if our receiver then know where we stand. Receivers to calculate their position, they need the following information: ? The exact location in space of at least three satellites. ? The exact distance between himself and each of those satellites. ? The exact time at which the satellite transmitted the information received. Briefly, because the entire process is complex and does not interest us, each of the satellites constantly transmit their exact position, its unique identifier, information from the satellite’s orbit, and very importantly, the exact time of which was sent transmission. With these data, the receiver can calculate the time it took to travel information and using triangulation to calculate its 3D position. With more satellites is achieved slightly higher accuracy. Basic is that the clocks of all the parts are very precise and are perfectly synchronized. The ideal is to have an atomic clock at the receiver, but its price is infeasible, so you place a normal quartz clock adjusts its time with the satellites. Moreover, theirs will be adjusted also by ground stations. As for timing, it is considered that the signal travels at the speed of light and necessary adjustments are made by small variations due to the atmosphere. ACCURACY OF GPS The accuracy of GPS systems can vary depending on many factors: weather, number of visible satellites, natural or artificial barriers? In general, captured more than 7 satellites, GPS accuracy is about 2.5 meters for 95% of the time, albeit with DGPS (Differential GPS) is available within 1 meter. Until 2001, this had to be added to the random error introduced due to U.S. military technology. However, since then there is no such fact was called Selective Availability. As for the DGPS correction is applied in the receiver with data from ground stations, they always have well defined coordinates. When receiving data from satellites, the station calculates its exact position to increase accuracy, as we have said may even be + / – 1 meter. Browser types Currently, a consumer may find the following basic types of browsers: ? Handheld GPS. ? Mobile phone with integrated GPS or agenda. ? GPS integrated into vehicles. ? GPS receivers for use with other equipment such as phones. For the ultimate in personal pleasure that I recommend Garmin for my use and knowledge is one of the best and affordable for the market.

WHAT WE CAN DO WITH A GPS

Posted by map on February 8th, 2010

Some possibilities offered by this device, almost all do the same, although some differences explained below. And these fundamental differences are based on the presence or absence of altimeterThis makes them to give us very accurate data related to those that have height, and the presence or absence of electronic compass, Which makes those who have also stopped functioning, ie they are able to tell the direction or measuring distance or the cardinal point where we stand. Those who have no compass only work to pursue a course when we are walking. Not to say neither one nor the other do not give us the altitude at all times (but with less accuracy) and the cardinal points (but not stopped). Those are the biggest differences, of course, accuse the price and when walking more comfortable but not fundamental.

The GPS software have several screens. One, to tell us where we should go to pursue a course or to reach a specific place or to follow a path that we have made previously on the computer, as I will explain later. Another, with the compass, which, by means of an arrow also indicates the direction to follow, and the cardinal points and other data. Others give us interesting data, which can be quite varied. Depending on the GPS this data can be: speed we carry, we kilometers traveled, distance left to us to reach a particular point, the time it will take to arrive depending on the speed that we, as long as we are moving, the While we stand, the average moving speed or the total average speed height at a specified time, the cumulative rise in whole tour, accurate meters will have at all times the device (ie, the maximum error we can commit, even going by where we indicated, does not usually exceed 10 usually meters), height profiles and much more data and unhelpful. There is a display devoted solely to this type of data and another with the main menu to access where we want. Can there be any more appropriate. You can customize many details.

What is the Global Positioning System (GPS)

Posted by map on February 7th, 2010

Author: KANATAONLINE
Modified on 16/11/2007

The Global Position System (GPS) or Global Positioning System (better known by the acronym GPS although its correct name is NAVSTAR-GPS1) is a Global Navigation Satellite System (GNSS) which allows to determine everyone’s position an object, a person, vehicle or shed, with an accuracy up to centimeters using differential GPS; usually a few meters. Although his invention is attributed to French and Belgian governments, the system was developed and installed, and is currently operated by the Department of Defense of the United States. GPS works through a network of 27 satellites (24 operational and 3 back) in orbit over the globe at 20,200 km with trajectories synchronized to cover the entire surface of the Earth. When you want to determine the position, the device used to it automatically locates at least four satellites in the network, which receives signals indicating the position and watch each of them. Based on these signals, the device synchronizes the GPS clock and calculates the delay of the signals, ie the distance to the satellite. By “triangulating” calculates the position in which it is located. The triangulation in the case of GPS, unlike the 2-D case is to ascertain the angle with respect to known points, is based on determining the distance of each satellite relative to the measuring point. Knowing the distance, is easily determined one’s position relative to the three satellites. Knowing well the coordinates or position of each of them emitting the signal, we obtain the absolute position or actual coordinates of the measuring point. Also extreme accuracy is achieved in the GPS clock, similar to that of atomic clocks carried on board each satellite. The former Soviet Union had a similar system called GLONASS, now managed by the Russian Federation. Currently the European Union tries to launch its own satellite positioning system, called ‘Galileo’.
ome mobile phones can be linked to a GPS receiver designed for that purpose. They tend to be independent modules that communicate with the phone wirelessly via Bluetooth and to provide the positioning data, which are interpreted by a browser program. This application of GPS is particularly widespread in mobile phones operating on the Symbian operating system and PDA with Windows Mobile but Nokia released the N95 with integrated GPS module

What is GPS? To Serve a GPS? … Practical Guide

Posted by map on February 6th, 2010

What is GPS? To Serve a GPS? … Practical Guide to GPS

Author: BODECOR (6020)

Circulating in the area has about 20 satellites that are capable of giving us the position on the earth taking into account the rate of emission of waves between them and a GPS. The mathematical foundations are complicated and need not concern us too, it really is to know what can be done with a GPS, in what sense are useful to us.

There GPSs for cars and GPSs for hiking, sailing, etc.. Some Member States have included an accurate map of roads, such as cars, drive you to them once you have set a destination and there is no map, as the most elementary of hiking, which lead us to a point which we are adding (coordinates) or lead us on a tour true that we have introduced previously.

What concerns us here are hiking or GPS navigation, etc.. which are the same. They are small gadgets (like the palms and less) laptops, designed to bring the mountain. They run on batteries that come to last between 4 and 10 hours, though they say it last longer. There are two outstanding brands in the market for this type of GPSs, GARMIN and MAGELLAN.

What GPS to buy?

Posted by map on February 5th, 2010

Author: LUISMORELLO (22)

This is a question whose answer depends on each person’s needs and preferences, of course. This document is intended to answer this question broadly.

The first question is how you will use the GPS. For example, you can use it for backpacking type trip, in your car or a boat. If you’re using in your car, you can use alone or with a laptop (to use OziExplorer, for example).

What brand?

In Venezuela there is only good maps for Garmin GPS brand, so it only makes sense for Venezuela to buy Garmin GPS brand. Other brands, such as Magellan, are excellent units. But without maps, are of limited usefulness.

? I are offering a GPS used.?

Sometimes it’s the only way to get a device, but beware. Typically, someone says: I sold it for $ 300 and I will sell for $ 250?. It turns out that in that time has come one who makes it, do it better, and comes much cheaper and again.

What to buy?

For hiking:

GPSMap 60CSX: The color screen is much appreciated. With expandable memory.

GPSMAP 76CSx: Similar to the 60, but fleet. A disadvantage is that covers the screen when using the buttons, which is a lack of design.

To take in the car:

276C: This is the model harder and more powerful, and has large clear screen. The only drawback is that is too large to load too.

NUVI: They are multimedia units. But they have the great disadvantage of not recording tracks.

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