Tik Tik Traking

” GLOBAL POSITIONING SYSTEM – GPS ”

AIM- It allows people and devices to pinpoint there location on� Earth .

What is GPS ?

The� Global Positioning System ( GPS ) is a satellite based navigation system made up
of a network of 24 satellites placed into orbit by U . S Department of defense . GPS was
originally intended for military applications but in 1980�s , the government made the
system available for civilian use.
There are no subscription fees or set up charges to use GPS.

How it works �

GPS satellites circle the earth twice a day in� a very precise orbit and transmit signal
information to earth. GPS receivers take this information and use triangulation to
calculate the users exact location. Essentially, the GPS receiver compares time a signal
was transmitted by a satellite with the time it was received� the time difference tells
the GPS receiver how far away the satellite is now, with distance measurements from a
few more satellites. The receiver can determine the users position and display it on the
units electronic map. A GPS receiver must be locked onto the signal of at least three
satellites to calculate a 2D position (latitude and longitude) and track movement with
four or more satellites in the receiver can determine the users 3D position
(latitude and longitude altitude ).

Use of GPS �

Military uses� for GPS � Although the GPS system was completed only in 1994.
It has already proved to be a valuable aid to U.S. Military forces picture the
desert with its wide, featureless expanses of sand. The terrain looks much the same
for miles without a reliable navigation system, U.S forces could not have performed
the maneuver in sandstorms or at night when even the Iraqi troops who lived there could
not� more than 1000 portable commercial receivers were initially purchased for their use.
The demand was so great that before the end of the conflict, more than 9000 commercial
receivers were in use in the Gulf region. They were carried by the soldiers on the
ground and were attached to vehicles, helicopters and aircraft instrument panels.
GPS receivers were used in several aircraft, including f-16 fighters, KC-135 aerial
tankers and B-52 bombers. Navy Ships used them for rendezvous, minesweeping, and
aircraft operations.

Some other uses for GPS systems �

There is far more that the average person can do with a GPS than just use it for
mapping.

Here are a few uses for a GPS that may get you thinking about purchasing one.

1� A GPS can help you locate a lost child. There are several GPS devices on the
market that are designed to be used for this purpose. some look like watches
that lock on a child�s wrist others look similar to cell phones. Some are
equipped with panic buttons that allow the user to press a button during times
of distress, signaling that he needs help. The signals form these devices are
often transmitted to a central location that will then call you an a predetermined
phone with the location pf your child of course. These devices can be used for
other people besides children.
2� when working in conjunction with your cellphone,A GPS can allow you to call
for assistance from anywhere, and your location can be tracked this means that
if to identify, emergency vehicles can easily find where you are or if you are
hiking in the woods are become injured help can track you down.
3� you can use your GPS as a exercise monitor if you walk run or cycle regularly
and like to change your route a GPS is a great tool to use. It can let you know
how fast you are moving it can also tell you how much distance you covered you
can easily ensure that you get exact number of miles in that you want,
even when you are taking an unfamiliar route.
4� A GPS can help you create a high tech scavenger hunt. A GPS scavenger hunt is
must is must like a traditional scavenger hunt teams of people have to hunt down
clues which lead them to their final destinations, often collecting items along
the way however, the teams use GPS handheld receivers to get from clue to clue
as opposed to traditionally written directions.

AMIT GAUTAM
B.Tech 1st Year EC