Ultrasound Boat Detection System

1
Ultrasound Boat Detection System

• By
• Mark Johnson
• Jonathan Lovisolo
• Yasuhiro Okuno

Advisors Peder Pedersen Fabio Carrera
Major Qualification Project
2
Presentation Overview

• Background
• Acquiring and Processing Signals
• Detecting Boats
• Testing and Results
• Future Improvements
• Closing Remarks

3
Background

• City of Venice wants to be able to monitor boat
  traffic
• Concerns that boats are causing damage to canals
• The system is designed to collect information on
  boat traffic and log it for future study

4
Pulse Echo BasedBoat Monitoring System
Venice Canal
Our System

• Boat detected at Fri Apr 04 150039
  2003
• Velocity of boat 14.1 (km/h)
• Length 6.3 (m)
• etc

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Basic object detection using a pulse echo system
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Multiplexer Using 2 transducers in one channel
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Pulse Sent, Echo Received
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Extracted Signal Information
Signal width
Signal strength
Signal amplitude
0
T
0
2 x t1
Echo return time
t1 is the time measured from the pulsing of
transducer to when the pulse hits the boat hull
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Detecting Boats

• Signal data is used to determine boat presence
• Similar echo return time
• Continuous reception
• Detection by both transducers
• If all are present we have a boat

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Boat Speed length calculation
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Boat Speed length calculation
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Logging Data

• Detected boats are logged
• Timestamp Fri Apr 04 150039 2003
• Velocity 14.1 (km/h)
• Length 6.3 (m)
• Stored for later retrieval and study

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Overall System
At the Canal
Software Environment on System
MUX
P/R
Echo signal
Data after Signal Processing
Logged data

• Echo
• Signal TRUE
• Delay 2 (ms)
• Correlation 2.3
• Width 16.2 (us)

• Boat detected at Fri Apr 04 150039
  2003
• Speed of boat 14.1 (km/h)
• Length 6.3 (m)

MUX Multiplexer P/R Pulser/Receiver
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Testing and Results

• Tank in lab

X-Y Plotter
P/R
Test Object
P/R
Top View
Side View
Transducer Beam sight
Transducer
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Test Setup Photos
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Test Setup Photos
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Test Results
A Timestamp Fri Apr 04 150039 2003
Velocity -0.031 km/h Length 0.064
m B Timestamp Fri Apr 04 150039 2003
Velocity 0.072 km/h Length 0.090
m C Timestamp Fri Apr 04 150039 2003
Velocity -0.031 km/h Length 0.090 m
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Development Stages First Generation
First Generation
Fish Tank
Pulser/Receiver
Digitizer (LeCroy9400)
GPIB
PC with test software

• Test of Theory in lab controlled environment
• Test that the method works
• Refine method of detection and data collection
• Establish a detection software

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Development Stages Second Generation
Second Generation
Pool
Pulser/Receiver
Laptop with digitizer card and test software

• Field testing
• Test theory established in first generation
• Deal with any irregularity of the real
  environment
• Finalize detection and data collection software

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Development Stages Third Generation
Final Generation
Standalone Embedded System
Venice Canals
Pulser/Receiver
Data Transfer Via Network or Removable Media
Research Team

• Deployment
• Implement all functionality developed in 2nd
  generation in a single standalone system.
• Test all functionality in field
• Deploy system for usage in Venice canals

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Future Improvements Wake height and pressure
detection

• In the Future
• Use Accelerometer or Pressure Transducer to
  measure force exerted on the wall.
• This data can be used to relate traffic and
  canal damage

Lateral Wave Force
Boat
Wake Height
Accelerometer or Pressure Transducer
With all the information, the log may look like
the following for each station (note the values
in the table is a sample and may not resemble
real data)
The pressure measurement unit is unknown at the
point of this writing, and the values may be
unreasonably off
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Closing Remarks

• The system can currently detect objects in a
  controlled environment.
• The current system is designed to be adaptable
  for future evolution.
• The next step is to test the system in the canals
  of Venice.

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We would like to thank

• Our advisors, Prof. Pedersen and Prof. Carrera
• Tom Angelotti and the ECE shop
• The Electrical Engineering Department at WPI

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Questions?