Gps Receiver

Our ancestors had to go to pretty extreme measures to keep from getting lost. They erected monolithic landmarks, laboriously drafted detailed maps and learned to read the stars in the wickedness sky. Things atomic number 18 much, much easier today. For less than $100, you can get a pocket-sized gadget that will tell you exactly where you ar on Earth at any moment. As great as you have a GPS receiver and a decease view of the sky, youll never be lost again. When people communication about a GPS, they usually mean a GPS receiver. The globose Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case atomic number 53 fails). The U.S. military developed and implemented this satellite ne dickensrk as a military navigation system, but soon open(a) it up to everybody else.

Each of these 3,000- to 4,000-pound solar-powered satellites circles the globe at about 12,000 miles (19,300 km), making two complete rotations every day. The orbits be arranged so that at any time, anywhere on Earth, there are at least four satellites visible in the sky.

A GPS receivers job is to locate four or more of these satellites, epitome out the distance to each, and use this information to deduce its birth location. This operation is based on a simple numeral principle called trilateration.





2-D Trilateration:
Imagine you are somewhere in the India and you are TOTALLY lost -- for whatever reason, you have absolutely no clue where you are. You find a friendly local and ask, Where am I? He says, You are 2600 Km from Delhi. This is a nice, disfranchised fact, but it is not particularly useful by itself. You could be anywhere on a circle around Delhi that has a radius of 2600 Km, like this:

You ask somebody else where you are, and she says, You are 2650 Km from Lucknow. Now youre getting somewhere. If you combine this information with the Delhi information, you have two circles that intersect. You now know that you must be at one

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