Satellite Communication is, so easy to understand. Because you will learn here, in simple way. Best Concept Satellite Communication System ,you are using, TV and telephone. also radio and internet. So you must know satellite communication. Hence learn complete information about satellite communication . You can also, download satellite communication pdf. satellite communication notes, and ppt.
Best Concept Satellite Communication System
I hope. you have tried before, to understand about satellite. What is satellite ? How satellite work. why satellite is moving around the Earth ? . Do you know ? You do many work in your daily life. Which is dependent upon satellite. For example, When you are watching TV, or when using GPS in your mobile.
Also when you are calling, your friend and family in foreign county. Hence all these work are done by satellite. So my first question is, what is satellite ? Well in simple way. Satellite is a small object. Which is moving, around a very big object. This is called Satellite.
Human Satellite Inspiration
Hence Moon is moving around the Earth. Which is also a satellite. But it is a natural satellite, Because it is not control by human. Moon inspired the human, to make its own satellite. After that human made its own satellite. And lunched this satellite into Earth orbit.
Which is helping now. And made the human daily life easy. Hence for your information, a satellite size like TV. And big like a truck. Its size depend upon satellite functions. Solar panel is there, on both side of satellite. Which provide energy to satellite. And main body of satellite, having transmitter as well as receiver.
Which work for signal transmitting and receiving. Satellite having some control motor, because you can control satellite remotely from the Earth. Hence can change, its location and angle.
what is function of satellite ?
Satellite function depends upon its work. But main satellite function is, used for communication. Because radio and ground wave can’t used for, Earth full communication. So satellite is made, mainly for communication. Why Satellite is moving around the Earth ? Well this is due to, Earth gravitational force.
Due to which satellite moves, around the Earth and does not fall on the ground. This is a simple law, if any object has to continue in space, then it will have to move around a big object like Earth. Hence it will not fall on the ground. Because satellite moving speed, will overcome gravitational force.
This is the reason, why all satellite are moving, but does not fall on the ground. Mainly there are three, types of satellites. which are given below.
- LEO ( Lower Earth orbit ), This site is generally used, for image scanning.
- MEO (Middle Earth orbit), This satellite is used in navigation .
- GEO (Geostationary Earth orbit), This satellite is mainly used for communication.
For more details information about satellite motion. you can refer my previous posts.
satellite communication block diagram
From the above picture, satellite block diagram. User is your mobile or TV. Signals goes from users to terrestrial body. Which is exchange. Then signal goes to Earth station. Parabolic antenna is used, to transmit signal to satellite. Hence satellite receive signal and amplify signal.
Because receive signal, by satellite is very weak. Due to losses of signal in space. There is a transponder in satellite , which remove the noises. After amplification of signal. satellite send back ,the signal to the Earth station. Therefore Earth station send this signal, to user through terrestrial body.
Satellite frequency, Satellite advantage and disadvantage
- A satellite communication operate on microwave frequency.
- Its frequency range is 1GHz to 50GHz.
- Uplink frequency is use 6GHz, (Actual value 5.75 to 7.075GHz).
- Downlink frequency is use 4GHz, (Actual value 3.4 to 4.8GHz).
Satellite advantages :
- Point to multipoint communication is easily done.
- Compare to fiber cable, signal is easy to transmit and receive.
- No need to change antenna direction on Earth station.
- During bad weather condition. Signal do not work properly.
- Signal need to amplify due to losses.
- Satellite communication range is limited 75,000km.
Classification of satellite communication
Based on principle of operation. Satellite are divided in two types. Because both operation are different, to each other. And both are use for communication.
- Passive satellite, it does not generate power. Because it has a metal cover on surface. Which reflect the signal, coming from one part of Earth, to other part of the Earth. So the coverage distance is very less.
- Active satellite, it has transmission equipment, which is connected with satellite. Such as transponder, which receive the signal and amplify it. And re-transmit this signal to Earth.
How do LEO, MEO and GEO, cover full image of Earth ?
These satellite are based on the altitude. LEO is very near to earth. So it covers very small surface of the Earth. Hence it required about 66 satellites, to cover entire surface of the Earth.
MEO it is at more height than LEO. Therefore it can cover, larger surface than LEO. So it required 10 to 12 satellite, to cover entire surface of the Earth.
GEO height is about 36000km, above the Earth surface. And its time period approx 24 hour. Hence one satellite can cover 40% of Earth surface. So minimum three satellite are placed at angle of 120° each. And hence it cover the entire surface of the Earth.
If you want some more information. About satellite communication . So check this link . And if you are looking for pdf file. Then must download satellite communication pdf. Because it is simple, and easy to understand.
I will continue in next post. With best concept of physics new topic. I hope, you enjoy learning satellite communication. So want your feedback. You can comment and share on social media. Thanks for sharing .Learn more and grow.