sri acoustics team - stevens institute of technology · 2018-11-06 · sri acoustics team july...
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SRI Acoustics Team July 24th, 2014 Update
"This material is based upon work supported by the U.S. Department of Homeland Security under Grand Award Number 2008-ST-061-ML0002. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied,
of the U.S. Department of Homeland Security."
Robert Garvin, Carrick Porter, Juan Carlos Santos, Dmitriy Savinskiy, Sarah Walsh
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Overview
● Introduction ● Methodology ● Results ● Recommendations
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Panga & Jet Ski
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Slipping Under the Radar
Courtesy of the SRI Synergies Team AIS from marinetraffic.com
Jet Skis on Hudson River
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Passive Acoustics ● SPADES ● Capabilities: ○ Detection ○ Tracking
● What is missing? ○ Automatic
Classifier
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Jet Ski: Frequency (Hz)
Frequency (Hz)
Inte
nsity
(dB
) In
tens
ity (d
B)
Acoustic Fingerprint Panga:
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Resources ● Vessel Acoustic Data Sets ● Signal Analysis Algorithms
o Extraction of key characteristics ● WEKA
o Classification tool
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Signal Analyzer
Process Flowchart
Hydrophone Machine Learning Data Base
Unknown Vessel
Classified Boat
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Blind Testing of Classifier ● An automatic classification algorithm was
design using the extracted data. ● Blind data set had 3 possible options for
classification: Panga, Jet Ski, or Other
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Blind Testing Results
Trial Actual Predicted Probability:
Other Probability:
Jet Ski Probability:
Panga
1 Panga Panga 0.11 0.008 0.882
2 Panga Panga 0.11 0.008 0.882
3 Panga Panga 0.413 0.015 0.572
4 Panga Other 0.616 0.195 0.19
Trial Actual Predicted Probability:
Other Probability:
Jet Ski Probability:
Panga
1 Other Other 0.914 0.01 0.076
2 Other Other 0.914 0.01 0.076
3 Other Other 0.641 0.068 0.291
4 Other Other 0.641 0.068 0.291
Blind Test 2
Blind Test 5
● Actual: Panga ● Classified as: Panga
○ 3 of 4 instances correctly identified
● Actual: Other ● Classified as: Other
○ 4 of 4 instances being correctly identified
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Conclusions ● Overall performance indicates automatic
classification is promising ● Jet Skis prove to be more easily identifiable
than Pangas ● Pangas similarity to other vessels makes
classification a challenge
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Recommendations ● Make the feature extraction automatic ● Obtain more data to create a larger
database ● Exploration of the usefulness of other
features ● Integration with Magello
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Acoustic Shape Method
Power Spectrum Data Acoustic Shape Compare in Database
Classifies Vessel
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Planned Integration with Magello
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Beth Austin DeFares, Dr. Barry Bunin, Dr. Alexander Sutin, Dr. Julie Pullen, Dr. Hady Salloum, Mykhail Tsionsky, Alexander Yakubovsky,
Alex Pollara
Thank You
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SRI Acoustics Team July 24, 2014
Robert Garvin, Carrick Porter, Juan Carlos Santos, Dmitriy Savinskiy, Sarah Walsh
Questions?