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12 Apr 2019

Technical Talk Report on Digital Communication in Satellite links

The Resource person of the Technical Talk was Dr. V. Sambasiva Rao, Director, Crucible of Research and Innovation, PES, University, Bangalore.

Dr. V. Sambasiva Rao is an engineering graduate from College of Engineering, Kakinada, (Andhra University) and obtained Ph.D from BITS, Pilani. For over 37 years, he had associated with ISRO in various capacities. He was responsible for the development of high bit rate data transmitters for all IRS series of satellites and various RF and microwave systems in S, C, X, Ku and Ka bands for IRS and INSAT missions.  He was also associated with the planning of communication satellites and development of associated technologies. He superannuated as Dy. Director from ISRO Satellite Centre in June 2011 and joined PES Institute of Technology/PES University in Bangalore as a Professor in E&CE Department and also associated with Crucible of Research and Innovation. Carried out various R&D activities including development of student satellite PISAT and established an S-band satellite control facility (Ground station) at PES University campus. Currently he is Director of Crucible of Research & Innovation.   Also, heading a Centre for Research in Space Science and Technology for spearheading the development of nano satellites - RSATs. He has published over 100 technical papers in national & international journals and symposiums.

Around 60 students (both UG and PG) from the School of ECE attended the Technical Talk.

The Technical Talk focused on following key points:

  1. Space segment satellites- LEO, MEO and GEO
  2. What makes a satellite?
  3. The dis-assembled remote sensing satellite
  4. Communication payload
  5. Communication systems for LEO satellites
  6. Data rate/ Spectrum / bandwidth – the Doppler’s shift
  7. LEO Scientific remote sensing satellites
  8. Intricacies of RF Communication – modulation techniques
  9. Multilevel modulation – why sub carreirs
  10. G/T for earth stations
  11. Communications link design and estimation
  12. Parameters affecting the link
  13. Typical spacecraft configuration
  14. Basic consideration for satellite communication
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