You all must have heard about satellites, but do you know what satellites are and how they work.
Sometimes you must have tried to find out what a satellite is, how it works and how it stays in the air, but later you may not have noticed it later because friends satellites are far away from us. We are not able to see them and in such a situation, the things we cannot see often lose their value.
But do you know? Out of all the work you do in daily life, there are many such tasks which are dependent on one or the other satellites. Usually a satellite is used, whether you are watching TV, looking at weather department information or using GPS location in your phone or even making a phone call in any other country and abroad, then all the work that is done here , Somebody is done by some satellite.
What is Satellite?
So here we talk about what this satellite is. Satellite is called satellite in Hindi. Satellite is a very simple word and it means that such a small object which is revolving around an object much bigger than itself.
In free space, in the air or in the air and here it means that the moon is a satellite of the earth, but we did not make it here, it was already good. That’s why the moon is a natural satellite and not a man made one, you hear that ISRO has launched a satellite, NASA has launched a satellite, it is not a satellite, the moon was already there.
what are satellites used for
So here we developed it, some clients who work for us and later we keep launching them, so that they keep helping us and the work we want to do with them, they keep doing satellite work, which is artificial. called a satellite.
These dudes can be so big and can be as big as a truck. Depends on what their job is, for whom they are launched.
Their size determines what height they will stay in, how fast they will spin, they keep on doing all those things, it depends for what purpose the satellite is launched.
But even here, the basic construction remains largely the same. The photos that we see in big panels are solar panels, from where they keep taking energy.
After that the main body which is there also has some circuit and other than that you get to see in it there are transponders which are normal: transmitters, there are receivers which take the signals and send the signals back.
Apart from this, there are also some control motors, with the help of which we can control satellites remotely and do a lot of finesse. For example they have orbit a, their little change angle aor change location. So we can do that with the help of those motors.
Apart from this, for what purpose have they been sent? Suppose they have been launched for photos or imaging, in such a way that Cameron can be seen, maybe satellite for some kind of scanning, some kind of sensing can be seen in some scanners for them, then it depends whether that went to launch the satellite which work.
but friends we work for these communications. Since you all know that I want to communicate from one place to another on the earth, because radio waves cannot cover the whole earth because radio waves will travel straight or you use ground waves or waves. They will go along with the surface of the earth, but still their capacity is much less compared to satellites.
So here the signal was sent to the point above the satellite. He received the signal and later threw it again towards the earth at some point below.
Friends, apart from this, if we use them for any work, then they take it for navigation or for imaging, for sensing, so here is a satellite on this basis, it keeps working for us.
How does a satellite stay in the air?
But the biggest question is that how does it stay in the air, then there are very simple laws about it, which were made by Johann Kepler and he had said that if any object has to stay in space, it has to revolve in some orbit. If he continues at a certain speed at a fixed velocity and he continues to trace his fixed path. So in such a situation, he will stay in his same class and he will not fall back after coming down. Because his speed makes him counter balance to the force of gravity.
But here again it differs from that speedo, how high is the dependency, how much is the difference between that vastu, between a small vastu and a big one, and the earth rotates very fast on a nearby satellite. Those who are far away from the earth rotate slowly but she is the principal of all and that is why she stays in the air.
what are the 3 types of satellites?
Satellites are divided into three different parts
Low earth orbit satellite
These Are at a height of a few hundred kilometers. Low earth orbit satellites revolve very fast and revolve around the earth many times in a day. In such a situation, it takes very little time to scan the whole earth. They spin very fast, some are at a height of 100 km and they make one round of the whole earth in about one to one and a half hours.
We use this satellite for imaging, for sensing, for scanning etc.
Medium earth orbit satellite
This is a satellite that does not rotate so fast but does not spin very slowly and revolves around the whole earth in about 12 hours. These satellites must pass at a certain place at a certain time, that is, their path or path has already been decided.
We use this satellite for navigation, whether it is GPS or IRNSS or Galileo etc. Medium earth orbit satellites are used for all these.
High earth orbit satellite
Now we talk about High Earth Orbit Satellites, these are those satellites, which are at the height of that magical thirty six thousand kilometers (36,000km). Where, if you raise which satellite above, then it becomes geosynchronous, that is, it starts traveling at a speed equal to the speed of the earth. This means that she makes her place at a certain place, that is, if the satellite is at your house now, then it will remain above your house because it is traveling at the same speed as the earth is rotating.
We use this satellite for communication because you would also like that if you put an antenna on the ground and are sending a signal to the satellite, then that satellite will remain the same today, it will remain the same tomorrow and the day after. Stay the same so that you can do what you want.