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How the Military and Civilians use GPS Computing Time, Velocity and Position GPS stands for Department of Defense. Though there are millions of civilian users today, the primary goal of GPS was for it to be operated by the military for which it was designed, in the first place. It enables receivers to compute position, velocity and time from satellite signals that have been encoded mainly for processing by GPS receivers. GPS can thus be used as a Satellite Navigation System. GPS has some other uses as well and these include the Space segment, Control
segment and User segment. Space segments have space vehicles which are used to send radio signals from space while the control segment is made up of a number of tracking systems located all around the world. The user segment is made up of the GPS receivers and the community of users. Such a receiver can convert the satellite vehicle signals into time, velocity and position estimates. The main use of GPS is to navigate in three dimensions and navigation receivers are built for ships, airplanes and ground vehicles as well as for hand held devices, used by individuals. Special purpose GPS receivers have been used in astronomy, telecommunications as well as in laboratories. Atmospheric pressure has also been calculated through use of GPS, especially in research projects. The Precise Positioning System is used by the U.S. military and some Government agencies and has 22 meter horizontal accuracy, 27.7 meter vertical accuracy as well as 200 nanosecond time accuracy. For the civilian user there is the Standard Positioning Services, the use of which does not incur any cost and is unrestricted. Most receivers can receive and use the Standard Positioning Services. But, it has less accuracy which is purposely done at the will of the Department of Defense, having 100 meter horizontal accuracy, 156 meter vertical accuracy and 340 nanosecond time accuracy. The GPS Navigation Message is made up of timed data bits that mark the time of transmission for each sub-frame as they are transmitted across by the space vehicles. Common errors that occur are due to noise, bias and blunders. GPS receivers are priced differently, depending on their capabilities and small receivers cost barely US$200 and may even be capable of accepting differential corrections. Other receivers having greater capabilities can cost thousands of dollars, depending on their unique features.
Find What You Need at a GPS Store If you are tired of shopping around in department stores or
store can be a blessing from heaven. This type of store offers a large variety of GPS items for reasonable prices from a knowledgeable source, combining what you want out of GPS with what you need out of a GPS store to create the ultimate shopping...
Can t Get Lost with GPS Handhelds Small, Affordable and Accurate Wonders of Technology GPS
to determine one s location as well know the exact time. Today s PDAs and cell phones are GPS enabled. Owning GPS handhelds is one sure method of always knowing one s location and time and thus makes it virtually impossible to get lost. But, just...
How the GPS Satellite System Works How Does the GPS Satellite System Work? The entire GPS
system which is made up of a network of 24 satellites that have been placed into orbit by the U.S. Department of Defense. The original plan and purpose was for U.S. military reasons only, but it was later decided that the GPS satellite system would...
GPS Tracker: Million Dollar Technology and This is what we do with it! Let s face it, owning a
single person you know - and most people you don t know. Having a GPS tracker in your possession is like a calling card that says I m Cool . With these pieces of technology, you can rule the world& or you could pick up some of these wonders of...
The Future is Here with Blue Tooth GPS In order to understand the benefits of Blue Tooth GPS
need to be aware of the way in which the world around us is changing. Discovering Bluetooth Bluetooth is essentially an industrial term that describes a piece of technology that is used in wireless personal networks. It provides a way to connect...
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