Webinar 6: Satellite Communication

Module 1 Fundamentals of Radio Communications     PPT  and    VIDEO

Module 2: Introduction to Satellite Communications   PPT  and    VIDEO
Module 3: Communications Satellite Services             PPT  and    VIDEO
Module 4: Introduction to Satellite Communications   PPT  and    VIDEO

Prof Arup Dasgupta, who had 48 years of experience in Satellite Communication, Remote Sensing and GIS presented these modules. A brief summary of each of these is given below:

Module 1: Fundamentals of Radio Communications

In this module the basic physics of electromagnetic radiation or radio waves are covered. A very short history of the evolution of wireless pioneers is followed by a coverage of the nature of radio waves, their range and classification by usage. An understanding of how radio waves propagate through the atmosphere and space and the effect of the earth and its near environment on these waves is discussed. The different techniques of superimposing information on to radio waves and the impact of electrical and electronic noise on the detection of the information is round off this module.

Module 2: Introduction to Satellite Communications

The historic paper by Arthur Clarke in 1945 on the use of geostationary orbits for global communications started the move towards the use of satellites for communications. The paper assumed that the technology would take 50 years or more to be realised. However, advances in both launch capabilities and satellite technology helped to realise satellite communications in less than 25 years. The principles underlying satellite communications is discussed. The rapid growth of satellites in terms of size and capability is covered. The module ends with a review of modern communications satellites.

Module 3: Communications Satellite Services

There are many different types of satellite services today. Some of these are Fixed satellite service, Mobile satellite service, Maritime communications satellites, Satellite for handheld mobile communications, Broadcast satellite service, Meteorological, Internet and other services. Each service is discussed in terms of satellite configuration and the kind of technology needed on ground.

Module 4: Advanced Communications Satellites

The trend in satellite communications is towards multiple services from the same platform. The stress is on personalised communications and the means to overcome last mile problems of connectivity by providing direct to consumer satellite services. These services need to be two way for interactive applications like education, telemedicine, internet and person to person communications. Communications is now required not only from earth to earth but from earth to space and to other planets as humankind moves toward colonisation of the Moon and Mars.