EMR Detection and Mitigation on the LSV2

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  • US Navy Acoustic Research Detachment
Team Name Team Echo
Duration Spring 2017 - Fall 2017
  • Dr. Herb Hess
  • Dr. Ata Zadehgol
  • Jacob Bechler
  • Kristen Wells
  • Jared Mahoney

Our goal is to investigate, develop, and improve EMR detection and mitigation techniques in order to assist the advancement of US Navy stealth technology.

Problem Definition[edit]

Problem Statement[edit]

The US Navy Acoustic Research Detachment in Bayview, ID on the southern shores of Lake Pend Oreille, is experiencing electromagnetic interference(EMI) issues with their acoustic data collection. They have asked us to locate the sources of electromagnetic radiation(EMR) and to figure out how to mitigate these sources to reduce interference.

Design Goals and Deliverables[edit]

  • Establish primary sources of EMI
  • Measure radiation and plot electromagnetic spectrum
  • Analyze and determine best mitigation techniques
  • Create and test mitigation scheme in lab


Specifications will be similar to the military standards listed here.

Project Learning[edit]


We are learning about electromagnetic wave interactions with materials, use of spectrum analyzer and antennas (loop and stub) to measure emissions, and industry and military standards for electromagnetic compatibility in order to provide the Navy ARD with a successful EMI mitigation solution. Details of our research include learning about various techniques for mitigation of both radiated and conducted emissions and the complexities that accompany these solutions.

Client Interview[edit]

Inverter Mod Graph
Graph of Accelerometer Data during the Inverter-Modification process done by the ARD

Lead Instructor and Technical Advisor Meetings[edit]



Single Shield Technique
Single Shield Technique
Double Shielding Technique
Double Shielding Technique


Antenna Array
Antennas sent to Team Echo from the US Navy ARD


The US Navy ARD has provided us with the equipment that they have been using so that we could try and recreate their results.

Inverter - Front
A front view of the inverter
Inverter - Rear
A rear view of the inverter
Spectrum Anazlyzer
Spectrum Analyzer

Test Setup[edit]

To test the setup and verify that the inverter is a primary source of EMI, we need to energize it and use the spectrum analyzer to observe the EMR it is emitting.

The operating voltage range of the inverter is 320-440VDC. To reach that range, we have been working in the power lab, connecting the 120V and the 240V generators in series and then feeding the resulting voltage into the inverter. To dissipate the power being generated and allow the inverter to actually draw the power, we are connecting the output of the inverter to 6 resistor banks in parallel, to reach a max load of around 7 ohms(?).

Test Setup
A picture of the test setup used to energize the system


Design Review[edit]

Phase 1 Flow Chart
Phase 1 Flow Chart
Phases 2 & 3 Flow Chart
Phases 2 & 3 Flow Chart
Phase 4 Flow Chart
Phase 4 Flow Chart

Team Information[edit]

Jacob Bechler Interests: Programming
Computer Engineering
Email: bech7863@vandals.uidaho.edu
Kristen Wells Interests: Electromagnetics and Acoustics
Electrical Engineering
Email: well5734@vandals.uidaho.edu
Jared Mahoney Interests: Computational Electromagnetics and Sensing
Electrical Engineering
Email: maho1488@vandals.uidaho.edu

Document Archive[edit]


File:Minutes(feb 7).pdf

File:Minutes(March 21).pdf

File:Minutes(March 28).pdf

File:Minutes(April 25).pdf