GPS – Global Positioning System is a satellite navigation system. First conceived as navigation aid by the military now number of GPS satellites broadcasts accurate timing signals by radio to GPS receivers.GPS provides a set of coordinates which represent the location of the GPS unit with respect to its latitude, longitude and elevation on planet Earth thus allowing them to accurately determine their location anywhere on the earth at anytime. It has become an important tool for map making and land surveying and is also used for very precise time reference needed for scientific research like the study of earthquakes. GPS receivers come in various formats, from devices integrated into cars, to phones to watches.
The GPS satellites broadcast accurate clock information in two forms:
Coarse Acquisition code/C/A-This is used mainly for civilian navigation which broadcast at 1,023 MHz repeating every millisecond. Each satellite sends a distinct C/A code, which allows them to be identified.
Precise code/ P-code- The P-code broadcast at 10.23 MHz, but it repeats only once per week. The P code is first encrypted into the Y-code, or P(Y), which can only be decrypted by units with a valid decryption key.
Applications of GPS:
There are number of fields where GPS has been used such as:
Military
It plays an important role in the military by helping to find precise targeting of military weapons such as missiles and precision guided munitions. It also provides good location awareness thus helping in controlling of forces and command.GPS satellites also carry nuclear detonation detectors.
Navigation
If you are someone who are likely to always get lost while driving then GPS is what you need in your car. It is used as navigation aid in cars, ships and planes. Hikers and trekkers use hand held GPS receivers to find their way. Even visually impaired people use this GPS equipment to guide their way.
Surveying
Construction workers also use GPS receivers for surveying the land to locate boundaries, structures, and survey markers, and for construction of roads.
Geocaching
GPS receivers are also used in recreational activities like geocaching where a hand held GPS receiver is used. Geocachers use this to travel to specific longitude and latitude walking or hiking to natural locations, searching for particular objects hidden by the other geocachers.
Aircraft passengers
Airline passengers can use GPS units in some airlines inside the aircraft except while landing and taking off as they have very little risk of interference. These airlines integrate aircraft tracking into the seat-back television entertainment system, available to all passengers even during takeoff and landing.
Precise time reference
For accurate time GPS is used. In time code generators GPS is used as a reference clock and also when sensors are deployed they are used to provide accurate time for each recording apparatus. Even atomic clocks are set to GPS time.GPS time is counted in days, hours, minutes, and seconds, in the manner that is conventional for most time standards.
Location-based services
Location based services also use GPS to locate all mobile phones. It provides a location solution is dependent more on mobile phones and less on telecommunications network topology. This also helps to provide specific location information to the mobile phone.
The biggest problem faced in GPS is that the atmospheric conditions can change the speed of the GPS signals while passing through the ionosphere. This effect gets minimized when the satellite is directly overhead and becomes greater toward the horizon.
By: Jeffrey Meier
Posts Tagged ‘Latitude Longitude’
GPS Systems Make Life Easier For All of Us
January 17th, 2010Posted in Article
Tags: Accurate Clock Applications Of Gps Global Positioning System Gps Equipment Gps Receivers Gps Satellites Gps Unit Hand Held Gps Land Surveying Latitude Longitude Location Awareness Map Making Military Weapons Navigation Aid Nuclear Detonation Precision Guided Munitions Satellite Navigation System Study Of Earthquakes Time Reference Timing Signals
Marine GPS
December 21st, 2009
Marine GPS systems have become most boaters’ best friend. Depending on the reasons you need GPS Navigation, they can make it easy to find your way back to shore in unknown waters, navigate at night, and find large fish or avoid debris. History of Marine GPS: While it wasn’t that long ago that boaters or mariners consulted star charts and latitude/longitude numbers to figure out their way back to land, Marine GPS navigation changed the need for the inaccurate tracking system that some could not figure out. GPS or global positioning systems came into vogue after the launch of satellites that could send a signal of latitude and longitude locations to figure exactly where anything was back on Earth.
This principal has been used in fishing sonars and marine GPS systems, that use anywhere from 12 to 24 satellites to figure out positioning. Why Using Marine GPS Navigation Systems? The answer is simple, it is more accurate, less hassle than previous methods to find out where you are on the open sea or any body of water for that matter. Also, the most important reason is for safety. Not only can it keep you from getting lost, but you can chart ways around tropical storms at sea, or alternate routes, for whatever reason.
The Future of Marine GPS: These GPS systems continue to get more sophisticated, and come in hand-held models, all the way up to marine GPS navigation lap top computers. Depending on the functions you want, you can find a marine GPS that can do whatever you want it to, when it comes to navigation, topography in foreign water bodies, or take it hiking and camping with you, if it is a hand-held portable marine GPS. Some of the larger cruisers and yachts use it to “auto-pilot” a ship, and navigate back to port in the dark of night. Advice On
Buying a Marine GPS: Be sure and research all of the models and functions for the type of Marine GPS navigation you are going to be doing. In other words, certain factors, like whether it will be for river fishing or ocean adventures can determine the model you need and the number of functions. If you are looking for a fish finder, you may not need an expensive Marine GPS system with all kinds of bells and whistles. Commercial fishermen, for example, would need them to not only get them back to shore, avoid the paths of storms, and find fish, but might need alarms for shallow reefs or other alarms where a normal recreational fisherman might not need these features.
Marine GPS navigation systems have gotten to be almost a requirement for all types of water navigation, and finding a marine GPS unit is easy at retailers, but especially online, where the choices are unlimited. As more manufacturers have gotten into the GPS systems, even cell phones are GPS capable now. It’s all a matter of the number of functions you need for what you are going to be doing, when it comes to marine GPS navigation.
By: Alexis Kenne
Posted in Article
Tags: Alternate Routes Auto Pilot Global Positioning Systems Gps Marine Gps Navigation Systems Gps Systems Lap Top Computers Latitude And Longitude Latitude And Longitude Locations Latitude Longitude Launch Longitude Numbers Marine Gps Ocean Adventures Open Sea River Fishing Sonars Star Charts Storms At Sea Tropical Storms
What is an Car and Truck GPS?
November 23rd, 2009
Do you travel a lot? Have you found yourself wishing you had a better way of finding your end point instead of using old fashion paper maps? If so, then you need an Car and Truck GPS. If you don’t know a lot about these devices, then you should know that they are the most modern way to find your way away. They can tell you exactly how to reach your end point by giving you precise directions. These directions are so advanced that it can even tell you when you need to make a turn and in which direction you are traveling. Choosing an Car and Truck GPS that is right for you will depend on how you plan on using the system.
These navigational systems work by using satellites to find your location and then mapping out a route to your end point. Without pinpointing your current location a new end point cannot be found. The system uses latitude and longitude to determine where you are and then to find the location you programmed as your end point. These systems can give you several routes to the location that you are searching for and it is your choice which one you decide to use. There are several different types of Car and Truck GPSs that you can choose for your vehicle.
There are both cheap and expensive Car and Truck GPSs available. Some of the cheaper models plug into the cigarette lighter of your vehicle and is great for the occasional use. However, these are a little harder to use than some of the other types. If you plan on using your system often, then you may want a bigger one with more features. There are several styles and sizes of these to choose from, so make sure you pick one that is suited for your vehicle. You wouldn’t want to choose a system that makes it uncomfortable when passengers are riding.
Some of these systems feature several different ways for you to find your end point. In other words, you can find a end point by using things like the address of the place you are searching for, a street name or choose a location from the map. These systems can use voice commands to help you find your end point. Many of them will also tell you the location of the nearest airport, bus station, train stations, ATM’s and banks. The Car and Truck GPS is a great asset to any vehicle that can ensure you never get lost or miss a turn again.
By: James Kronefield
