What You Want to Know About GPS Receivers
By now, you've likely heard about this hot new technology called GPS. Handheld GPS receivers are popular items that are being used by everyone from outdoors enthusiasts to average drivers. But, how many of us really understand the technology behind these modern-day marvels?
There is a whole lot of power and capability packed into a GPS receiver. They are linked to complex satellite systems in outer space, providing a reliable navigational system to users on earth. Many new cars have GPS receivers included as standard equipment. Hikers use them to find their destinations, and treasure hunters rely on them for Geocaching excursions.
Simply, a GPS is an electronic device that can determine one's precise location on earth. The entire system is anything but simple; and the GPS receiver is but a single and minute part of this immense network. GPS is the short form of Global Positioning System. This very large navigation system was developed and implemented by the United States' Department of Defense (DOD). The system is composed of a network of 27 satellites, various ground stations located at points throughout the world and individual GPS receivers. Most of the 27 satellites in the GPS are active, and continuously send radio signals. GPS receivers use these signals to determine their geographical location.
Function
The primary function of a GPS receiver is to pinpoint its actual location on earth using the signals it intercepts from GPS satellites. To do this, the GPS receiver must be able to locate and intercept signals from three or more GPS satellites. After intercepting the signals, GPS receivers use basic principles of mathematics called triangulation or trilateration to compute its actual position. Before any triangulation calculation can be implemented, however, the GPS receiver must verify two points:
1- The positions of at least 3 satellites
2- The distance between each satellite and the receiver.
GPS receivers decode the signals in order to determine the locations of at least three GPS satellites. The signals transmitted by GPS satellites are radio signals, and each contains three different bits of information: ephemeris data, almanac data and a pseudorandom code. The ephemeris data is the information that the GPS receiver needs to be able to determine the actual position of the satellite transmitting the signal.
The distance of a GPS receiver to a satellite is measured using the signal's speed, or the time delay from the initial transmission of the signal, to its reception by the GPS. From this speed or time difference, the GPS receiver calculates the satellite's distance.
With information about the location of at least three or four satellites, along with their individual distances, a GPS receiver utilizes the basic principle of triangulation to calculate its actual position in terms of altitude, latitude and longitude.
Accuracy
GPS receivers are incredibly accurate, usually to within twenty meters of radius. It is possible, however, to increase this accuracy level using supplemental technologies. Some GPS receivers using multiple parallel channels can achieve an accuracy level to within fifteen meters. More complex systems such as DGPS (Differential GPS) and WAAS (Wide Area Augmentation System) can reduce this range to an impressive three meters.
Despite the use of these supplemental technologies, there are still many factors that can cause even the best GPS receivers to broadcast inaccurate locations. Among these factors are:
* Number of visible satellites
* Radio signal delays caused by the passage through the ionosphere and troposphere
* Signal multipath (bouncing of the signal as it hits an object)
* Inaccuracy of GPS receiver clocks
* Ephemeris errors (inaccuracy of the satellites' reported locations)
* Poor positioning of satellites (i.e.: satellites in a linear position, or in a tight grouping)
Some, but not all, of the GPS errors caused by these factors can be remedied by the software that is packaged with personal GPS receivers. If you are having difficulty with the accuracy of your GPS receiver, check your user guide or refer to the software to see if the problem can be fixed.
Technology has given us wonderful gifts and powers beyond imagination. A GPS receiver is one technological wonder that is so accessible, many people use them on a daily basis. If you travel locally or across country, or enjoy exploring the great outdoors, pick up a GPS receiver and you'll always be able to find your way home.
Questions and Answers
Article Tags:
computer
,internet
,hardware
,software
,online
,website
,search engine
,seo
,technology
,science
Keywords are an important factor of producing a website and getting traffic. These are the terms which the search engines use to categorize and rank your webpages. For example, if your website is about "traffic building" then your keywords could include traffic,building traffic,website traffic, and so forth.
Maneuvering the business process and ensuring the right proportions of profit earning are the fundamentals of all types of the business, whether it is small business or the large corporate. Internet marketing is no exception. Online businesses employ a number of techniques and strategies to increase the
With almost 85% of Internet users accessing search engines to find products and services, according to a top Arizona SEO Company, web sites that do not have a natural search engine optimization plan that gets them a Top 10 search engine ranking are missing out on a lot of business.
There is no doubt that search engine optimization (SEO) is very important to the overall success that you have with your website. Unfortunately, however, there are many people out there who spend lots of time and money submitting their websites in hopes of improving their search engine rankings.
If you're thinking about better exposure online then you'd probably start putting more time and effort on social networking. Social network sites are the new user created content hubs that can offer large amount of traffic to any website that can properly pitch online user's interest. MySpace, Friendster,
Every search engine uses it's own, very specific algorithm to index the websites. All major search engines keep updating their search algorithms quite frequently to give their searchers the best searching experience. Your website's place in the search result pages depends on it's calculation from the
An in depth look at the new MMORPG from Blizzard Entertainment known as Diablo III, a long awaited release for Diablo fans.
Most small businesses take advantage of computer technology, and it certainly can make things a lot easier for everyone within the business when you do so properly. Unfortunately, there are also a number of different problems that can occur as a result of the technology that you are using.
Copying ipod to computer is easy. For more information on how read this article.
Online training software has found its place in almost all the offices and organizations. It can be used to train employees over the net
According to leading research carried out by Gartner, the number of PCs distributed throughout the first quarter of 2012 went up by 1.9% which was better than analysts predicted.
business from home opportunity work, from home work, moms, career, health, womens, part-time, goals,
The Moguls did it. So did the Vikings. "A mouth of a perfectly happy man is filled with beer." After coining that phrase, you don't think this anonymous Egyptian from 2200 BC kept it to himself. I can see him raise his drinking vessel to his Nile-side neighbors while repeating the words.
Nearly everyone enjoys making money. More often than not, the more money we make the better we feel and the more confidence we have. These are good things as long as making money doesn't get too emotional. If investing is treated like a business and most of the emotion is left behind, many people can do well
Many students find math a challenging subject, and hiring math tutors can provide a great solution for trouble in the classroom. Difficulty with math is a widespread problem, particularly with the strong emphasis on testing for students in all grades. High stakes tests can create anxiety, especially for math
Each year, an unlimited number of individuals make the decision to travel to Hawaii. Hawaii trips have rapidly increased in popularity over the past few years. There are a number of different reasons for that, such as the beautiful weather and breathtaking beaches. It fact, it has often been said that the
