Raina Kelsey is an expert author, and writes about latest gadgets.
Cheap Sat Nav Devices
Tom Tom Go 720 Sat Nav
Garmin Zumo 550 Sat Nav
Global Navigation Satellite System (GNSS) is the standard generic term for satellite navigation systems that provide autonomous geo-spatial positioning with global coverage. It allows small electronic receivers to determine the location including longitude, latitude and altitude to within a few meters using time signals transmitted by satellite radios. The precise time for the reference of scientific experiment is calculated by the receivers on the ground with a fixed position.
The NAVSTAR Global Positioning System by the U.S. is the only fully operational GNSS. Russia with GLONASS is all set to enter into the field of GNSS. The European Union’s Galileo positioning system belongs to the next generation GNSS in the initial deployment phase, which is expected to be operational in 2010. The Beidou navigation system by China is expected to get operational in near future. IRNSS by India is in developmental phase and is expected to be operational by around 2012.
The history of satellite navigation devices traces back to the cold war area. Transit, the first satellite navigation system was deployed by the US defense forces in the 1960s. Transit's operation was mainly based on the Doppler Effect. By monitoring the shift of the frequency over a short time interval, it is possible for the receiver to determine the location to one side or the other of the satellite, and several such measurements combined with a precise knowledge of the satellite's orbit can fix a particular position.
The latest satellite navigation devices are more direct. They are capable of broadcasting a signal that carries the position of the satellite and the precise time of the signal transmitted. The position of the satellite is transmitted in a data message that is superimposed on a code that serves as a timing reference.
The main purpose of satellite navigation devices are military applications. Satellite navigation allows for hitherto impossible precision in the delivery of weapons to targets, greatly increasing their lethality whilst reducing inadvertent casualties from misdirected weapons.
- Related Videos
- Related Articles
- Ask / Related Q&A
- Sat Nav Devices – Directs you to Drive Safe
- Sat Nav Devices: Your Best Bet for Finding Unknown Locations
- Sat Nav Devices - Dependable Travel Companions
- Garmin Sat Nav Devices - Perfect Accessories for Frequent Travelers
- Sat Nav Devices
- Sat Nav Devices - Guidance for Selecting the Best
- Top Quality Sat Nav Devices Need Not Cost the Earth
- Tomtom Go 720 Sat Nav Device – your Perfect Traveling Companion
5 Inch Touch Screen GPS Navigator w/FM Transmitter (Sports Ed.)
By: szpren | 05/01/2010This 5 Inch Touch Screen GPS unit comes in a sleek three color design, Red, Silver and Black. Driving will never be the same again thanks to its wonderful performance and smooth touch screen interface.
What GPS-RFID Technology Can Do for Your Fleet
By: Tom Gruich | 01/01/2010GPS/RFID technology combined with trucking fleet software has many applications in the real world. If your company owns a fleet, ships merchandise or is involved in the transportation industry, now is the time to invest in the latest technology.
The GPS Navigation System
By: Geovani Stoner | 28/12/2009The GPS navigation system, however, forms the bridge between safety and entertainment features.
Track your lost iPhone using find my iphone
By: Alex zhang | 27/12/2009Find My iPhone is Apple in the iPhone OS 3.0 added an important feature for iPhone users have a MobileMe account.
Google to release mobile phone tracking
By: Alex zhang | 27/12/2009Google is to release mobile phone tracking using its google maps.
Keep Yourself Updated with Portable GPS
By: Article Manager | 24/12/2009Portable GPS systems have gained world recognition within a very short span of time. These systems are also very helpful in getting detailed information about the nearby restaurants, gas stations, banks and almost all the important establishments.
Coolest GPS Watch - Location Finder + Data Logger + Photo Tagger
By: szpren | 24/12/2009The GPS watch houses 4-in-1 GPS features that let you track your location anywhere on the globe. The GPS watch can be used for tracking your car by the push of a button.
2-DIN 7 Inch LCD Car GPS Navigation Media Center w/Bluetooth
By: szpren | 24/12/20092-DIN 7 Inch LCD Bluetooth Car GPS Navigation provides you a safer and more enjoyable driving experience.
Samsung Tocco Lite a tiny-winy wonder machine
By: Raina Kelsey | 04/01/2010 | Cell PhonesThe Samsung Tocco Lite scores high on usability, despite its small size. In fact, being small acts to its advantage, as its size makes it easy to carry along. It is blessed with revolutionary features and breathtaking looks.
Sony Ericsson Aino a Style re-invented
By: Raina Kelsey | 04/01/2010 | Cell PhonesThe Sony Ericsson Aino is quite popular among the users, for its superb looks and out of the box features. The 8.1 mega pixel camera that it is blessed with attracts millions of individuals towards this amazing gadget.
Get highly benefited mobile phone comparison
By: Raina Kelsey | 04/01/2010 | Cell PhonesIn this modern world, everyone wants to get perfect things. Mobile phones which have become an important part of life is fulfilling the communication requirements of people efficiently. Availability of large number of phone manufacturers plus supporting on line phone shops are benefiting people to get their desired handset. Users can easily compare between different branded handsets before making final choice.
Christmas Phones Offers: Best way to own phones at affordable costs
By: Raina Kelsey | 29/12/2009 | Cell PhonesChristmas Phones offers are the best way to own a mobile phone at affordable costs. Different handsets manufacturers and dealers, retailers and others introduces various offers for the individuals whereby one can make the most of every bit of money spent. So it is indeed a high time to go for shopping mobiles.
Mobile Phone Insurance
By: Raina Kelsey | 29/12/2009 | Cell PhonesThe people, today, have become very much aware of the mobile phone insurance and its associated benefits, as a result the number of the insured mobile phones are growing by every passing day. It is indeed a wise decision to go for an insurance cover even for phones, as by doing so one gets relieved from the burden of the losses caused in the event of any untoward incidents.
Nokia 5800 Xpress Music : Outstanding multimedia features combined with high speed performance
By: Raina Kelsey | 29/12/2009 | Cell PhonesThe Nokia 5800 Xpress Music has been very much popular because of its outstanding music playing capabilities and some of the other multimedia aspects. This is not all, the device scores very high even on the performance aspects.
Symbian Mobile Phones: Supporting great performance
By: Raina Kelsey | 29/12/2009 | Cell PhonesSymbian mobile phones have immensely been popular these days, the number of users finding these devices more comfortable to use, are increasing day by day. It is so as these devices are loaded with the features to support high quality multimedia aspects and the overall performance.
Nokia Mobile Phones: There is one for almost everyone !
By: Raina Kelsey | 29/12/2009 | Cell PhonesThe Nokia mobile phones have always been in the news for the successful launch of various mobile phones in various price categories and for the benefits of the individuals worlwide. Recently there have been many phones including N97 and N900 that have one wonderfully well in the market.