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Introduction to Electromagnetic Compatibility/Interference (EMI/EMC) in Communications Systems course



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Summary:

The objective of this 14 hour course is to increase knowledge in the area of electromagnetic compatibility or the risk of potential interference among various radiocommunication systems. The interference cases would result from the operation of one system as against others (e.g., radar affecting land mobile radio, and vice versa; satellite communications affecting terrestrial microwave, and vice versa). It is assumed that all operating equipment has been designed and tested to satisfy common technical requirements, such as FCC consumer certification and MIL STD 461F. As a consequence, EMI is that experienced primarily through the antennas used in communications. The instruction will be conducted in the classroom by Bruce Elbert using PowerPoint slides, Excel Spreadsheets, and link calculation tools such as SatMaster. The overall context is spectrum and frequency management to enhance knowledge in identifying and mitigating potential interference threats among various systems. Attendees are expected to have a technical background with prior exposure to radiocommunication systems and equipment.

Course oultine

Instructors:

Bruce Elbert is a recognized SATCOM technology and network expert and has been involved in the satellite and telecommunications industries for over 35 years. He consults to major satellite organizations and government agencies in the technical and operations aspects of applying satellite technology. Prior to forming his consulting firm, he was Senior Vice President of Operations in the international satellite division of Hughes Electronics (now Boeing Satellite), where he introduced advanced broadband and mobile satellite technologies. He directed the design of several major satellite projects, including Palapa A, Indonesia's original satellite system; the Hughes Galaxy satellite system; and the development of the first GEO mobile satellite system capable of serving handheld user terminals. He has written seven books on telecommunications and IT, including Introduction to Satellite Communication, Third Edition (Artech House, 2008), The Satellite Communication Applications Handbook, Second Edition (Artech House, 2004); and The Satellite Communication Ground Segment and Earth Station Handbook (Artech House, 2001). Mr. Elbert holds the MSEE from the University of Maryland, College Park, the BEE from the City University of New York, and the MBA from Pepperdine University. He is adjunct professor in the College of Engineering at the University of Wisconsin - Madison, covering various aspects of data communications, and presents satellite communications short courses through UCLA Extension. He served as a captain in the US Army Signal Corps, including a tour with the 4th Infantry Division in South Vietnam and as an Instructor Team Chief at the Signal School, Ft. Gordon, GA.

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Key concepts of evaluating radio frequency interference:

  • Elements of a radiocommunication system transmission and reception, signals and bandwidth
  • Types of electromagnetic interferences natural and man-made (unintentional and intentional)
  • Interference sources conducted and radiated, paths and receptors

Link Budget equations

  • Line-of-sight range equation, power flux density
  • Determining effective radiated power and receiver threshold
  • Evaluating antenna properties and coupling factors

Interference analysis examples between various systems

  • Service performance in the presence of interference, interference control through design and coordination
  • Radars vs. land mobile systems
  • Satellite communications vs. terrestrial microwave systems

Spectrum sharing and potential EMC

  • Current frequency allocations for government and non-government use (1 MHz through 100 GHz)
  • ITU designated bands for sharing as Primary and Secondary services
  • Sharing criteria as mandated, as negotiated

Interference threshold or criteria

  • Definition of Carrier to Interference (C/I) ratio
  • Classification of C/I adjacent channel, co-channel, cross-polarization, inter-beam

How to identify, prevent, and fix common EMI/EMC problems

  • Identifying interference in the real world detection, location, resolution
  • Physical separation, orbit separation
  • Site and terrain shielding
  • Interference suppression analog and digital processing techniques

Hardware design (Basic) regarding Interference suppression circuits in systems

  • Engineering design rules and product verification
  • Product testing MIL-STD 461F, FCC compliance
  • Safety margin

Frequency reuse and signal propagation

  • Cross polarization on the same path
  • Angle separation through antenna beam selection
  • Cellular pattern layout
  • Non-steady state propagation scatter, rain-induced interference, ionospheric conditions

Tuition:

Onsite pricing is available. Please call us at 410-956-8805 or send an email to ATI@ATIcourses.com. Register Now Without Obligation

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