How GPS find pin point location ?How GPS works
A Korean Airlines flight 007 was going from New York to the
South Korean capital Seoul. The weather was very clear and the pilot was not
facing any kind of problem, but despite all these things, the plane crashed and
that too only because of this. Because he didn't have the thing that we all
have in our pockets. Yes, it was like that before landing in Seoul, the plane
had to go to Anchorage, Alaska.
This is happening in 1983, when the United States and The
Cold War was going on between the Soviet Union and the two powers were very
much on alert against each other. Flying the plane would have entered Soviet
territory, so Flight 007
had to take something like that to South Korea, fly through the Gulf of Alaska
into the North Pacific Ocean, and then over Japan. What did the pilot know
about South Korea? This war between the two powers will leave 269 passengers
dead. In this era, there was no GPS and the pilot accidentally drove into the
Soviet headquarters.
The Swiss thought it was an American plane and fired
air-to-air missiles at it. Moments later, the plane went into the sea near the
Soviet-controlled Muniron Island, where the news shocked the world. He was
saddened the most by the fact that even though he had GPS technology after him,
he could not prevent this accident. In 1983, US President Ronald Reagan
announced the opening of GPS to civilian news.
Viewers, earlier humans used to travel by looking at the
stars in the sky and could estimate their position, and now we do not use the
stars to see our position, but definitely use satellites moving in the sky,
mobile phones, vehicles, flight navigation. And even now it has become very
easy to track the location of pets and all this is made possible by this little
chip called GPS i.e. Global Positioning System, whether in the desert or in the
sea or in a forest. How come this little doll tells us our pin point location,
such an important service, without which the world system can go from place to
place, why do we get it for free and live traffic through Google Maps GPS? To
answer these questions, how does it make predictions, it is important to first
understand how GPS works.
We all know that our phone has a GPS receiver, as soon as we
turn on our location service, it starts receiving a signal from a 24 GPA
satellite orbiting the Earth. This signal contains only time. The satellite has
an atomic watch, which is also called the best watch in the world. The
satellite knows its location, but not our phone. In which minutes and seconds
will it be over which part of the world? The satellite tells its time to the
GPS receiver in our phone through a radio signal and also sends its location at
the time this radio signal is generated. Whatever time is on the atomic watch,
it only tells the radio signal that travels at the speed of light and reaches
our phone.
But the question is that knowing the time and location of
the satellite, how do we know our location. Suppose you are standing near the
Eiffel Tower in Paris and the satellite is above Switzerland. Of course, the
speed of light is very fast. But to cover such a large distance, it will
definitely take some time for the signal to reach you.
After receiving the
signal, the phone matches its time with the time sent from the satellite and
calculates the difference. If the delay is 0.002 seconds, then it is not
difficult to know how far the satellite is from us. It is also very easy. The
speed of light which covers 3 lakh kilometers in a second means Light will
travel 600 km in 0.002 seconds, so it would not be wrong to say that the
satellite was 600 km away from us when it sent the signal. Yes, it makes the
phone know that it is present at some corner of this circle, but this circle is
very big. Not enough for us.
To make this
location accurate, the same process is done with the second satellite, which we
call satellite P. Let's suppose that satellite B is currently over Spain, and
our phone has determined from all this calculation that it is. The satellite is
1100 km away from us, now our phone has not one, but two circles, one of
satellite A and the other of satellite. Now, in order to make the pin point
more accurate, the phone has to receive signals from at least four satellites.
The more circles are formed, the more accurate our location will be. The
biggest relationship is with time. If the time of the receiver, that is, our
phone, is wrong even by one second, then there will be a difference of
thousands of kilo-meters in the location. Also becoming more modern, today many
GPS devices are being provided with built-in batteries and have their own clock
inside, automatic time updates are also done with the help of mobile operators
and the Internet.
Now the
question arises that today no one even advises anyone for free. How is such a
large facility free? Is the whole world not being monitored through this
service? These satellites can send signals only one way and they don't even
know who is using them from where and at what time, so there is no question
that by giving free service to us.
It is being monitored and is free to
consumers, while mobile manufacturers collect annual taxes from the airline
industry and the transport sector to fund the cost of these GPS satellites. The
technology is now so common that if it If not, the entire world's economy may
suffer significant losses, flight navigation will be disturbed, transport
companies will not be able to track their trucks, tracker companies will be out
of business, and maybe your favourite restaurant up. could not deliver the order
on time.
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