communication system ; special notes

                                      Special Notes

A communication satellite placed in orbit of space.

  Question 1: Today's era is called the era of communication.  What are the different means of communication?  

Answer: There are various means of communication - cable communication, optical fiber communication, tropospheric and ionospheric communication • Microwave communication and satellite communication.  

• Question 2: Satellite communication among all modes of communication • Why is the system considered the best? 

  Answer: Satellite communication system is highly efficient • and is very useful for remote regional, emergency communication and disaster management.  It is easy to maintain, • Installation and it is easy to start a new service.  3 satellites located in the Earth's geostationary orbit (36000 km away from the Earth's surface) can establish communication system throughout the Earth.  36000 km from the earth  Three communication satellites located at a distance of around the earth can establish communication system. 

                                             

3 communication satellites located at a distance of 3600 km from the Earth.

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Question 3: What is the path of the satellites in space? 

  Answer: These are called class in Hindi and orbit in English. 

 Question 4: In which orbit the space of communication satellites is placed?  

 Answer: All communication satellites are 36000 km from Earth.  The far Earth is placed in an orbit parallel to the equator.  This orbit is called Geostable: Orbit. 

 • Question 5: Communication satellites are 96000 km from Earth.  Specific reason to set up at a distance of?

  Answer: Yes, there is a very specific reason for this.  36000 km from the Earth's surface.  Any distant object or satellite in its orbit is worshiped at the same speed with which the earth resides in the axis.  It is a great gift of nature that the Earth and the satellite here.Relative speed between zero.  The technical advantage of this is that once the antenna of the Earth's geostation is oriented towards the antenna of the satellite, both the antennas are continuously face to face (although the earth is rotating) and not to adjust it again and again.  Does matter .  

• Question 6: How was Arthur C Clarke's name linked to the satellite communication system?  

 Answer: It was Arthur C Clarke who suggested for the first time in his research paper in 1945 that geostationary orbital satellites could be used for communication.  

• Question 7: How communication process is carried out by satellites? 

 • Answer: The antenna of a geostationary station on Earth transmits the signal (in high frequency) to the satellite through its parabola shaped antenna dish. The satellite converts the high frequency to low frequency and then sends it back to Earth.  Is where the Earth's second Earth Center (for which this message was sent, it is captured.) 

Q8: In the context of communication satellites, the terms c - band, ku - band ka - band are heard. What about them  Means?

 Answer: C band, Ku - band, Ka - band frequencies (frequencies by which the transmission and receiving processes are carried out. 4000-8000 MHz frequency to C - band, 12000-18000 MHz)  Ku-band and 27000-40000 MHz are called Ka-band.

Question 9: 36000 km from Earth.  The orbit is referred to by two names - Geostationary Geostationary) and Bhootulekali (Geosynchronous).  What do they mean? 

 Answer: 36000 km from Earth.  The distance of the orbit that is at full parallel to the Earth's equator (ie it has zero inclination on the equator plane) is called a geostationary orbit.  Conversely, if the orbit is not completely parallel (ie tilted with some angle at the equator) it is called a geostationary orbit.  The geostationary orbit is an ideal situation and the geostationary orbit is a common experimental condition.  All communication satellites are in geostationary orbit. 

 Question 10: What does 'transponder' mean in a communication satellite?  

Answer: Like a human body, a communication satellite also has many parts such as structure, country and telemetry system, propellant system, power system, antenna system, manpower system and transponder.  The transponder is basically called the heart of the satellite and this is the process of sending and receiving from the earth.  The more transponders a satellite has, the greater the communication capacity of that communication satellite. 

 • Question 11: How are these communication satellites placed in space? 

  Answer: They are installed in space by giant launch rockets.  These rockets leave these satellites in the elliptical orbit of the Earth from where they are transported into orbit determined by the apogee geostationary motors / propellants placed in them. 

 • Question 12: What is the difference between natural and artificial satellites? 

 Answer: Man-made satellites are called artificial satellites.  Sputnik-1, the satellite of the INSAT system, the satellite of INSAT system in India, is an artificial satellite, while the lunar orbits of the Earth, Jupiter and Uranus are called natural satellites.

Telemedicine remote healthcare carried out by communication satellites.

https://sattelliteworld.blogspot.com/2020/06/space-shuttle.html?m=1

• Question 13: Artificial satellites have two more divisions - passive and active.  What do they mean?

   Answer: Artificial satellites that do not require any kind of electrical energy are called passive satellites such as the 'Echo-1' satellite of the past which functioned just like a reflector in space.  All today's artificial satellites are active satellites.  • Question 14: In the context of communication satellites (and other satellites), two terms - Apoji and Periji are also heard.  What do they mean?

  • Answer: The lowest distance from Earth of an artificial satellite is called Periji and the optimum distance is called Apoji. 

 • Question 15: What are the other divisions of satellites apart from communication satellites? 

 • Answer: These divisions are - remote sensing satellite, meteorological satellite, scientific, atmospheric Study satellite, search and rescue satellite, astro satellite etc.  

• Question 16: From where communication satellites are controlled? 

  Answer: Communication satellites are controlled round the clock from the control center located on earth.  For example, the control ground of INSAT satellites in India is at two places - at the Hassan site in Karnataka province and Bhopal in Madhya Pradesh.  These control ground stations are called master control facilities 

• Question 17: What is a polar orbit? 

 Answer: The orbit passing over the northern and southern poles of the Earth is called polar orbit. 

 Question 18: What is the reason that the communication satellite Earth.  Are placed in an orbit that is parallel to the Earth's equator, while remote sensing satellites are placed in the Earth's polar orbit?

Answer : Communication satellites from above the Earth's equator cover the optimum part of the Earth in terms of communication.  Remote sensing satellites observe the entire earth while in polar orbit, when the earth is moving in its axis from west to east.  

• Question 19: India's domestic satellite communication system system. What are the three special features of 'INSAT', which are unique in the world?  

Answer: India is the first country in the world to provide three services telecommunications, television and meteorological services through a single communication satellite.  Satellite communication  • We are the first country in the world to use Extended Sea - band frequency (6725-7025 MHz frequency for transmitting from Earth to satellite and 4500-4800 MHz frequency for transmitting from satellite to Earth) for the first time in the system.  India is the first country in the world to launch a search and rescue service from a geostationary orbit. 

 • Question 20: What services are being provided by satellite communication system today?

  • Answer: These services are as follows.  1. Telecommunications 2. Television, 3. Meteorological Services, 4.  Telemedicine 5. Video Conferencing 6. Search and Rescue • Service 7. Internet Service 8. Remote Learning Service 9. Disaster Management etc.