jre imps2005

Information about jre imps2005

Published on November 6, 2007

Author: Mee12

Source: authorstream.com

Content

Submerged Object Detection with Indirect Passive Sonar:  Submerged Object Detection with Indirect Passive Sonar Joseph R. Edwards†, Monica Montanari†, Don L.J. Chiat‡, I.N. Goh‡, Justin A. Nave† and Henrik Schmidt# †VASA Associates, Inc., 8300 Greensboro Dr., Suite 800, McLean, VA 22102 USA ‡Singapore Defence Science and Technology Agency #MIT Department of Mechanical Engineering, Cambridge, MA 02139 USA Outline of Presentation:  I.    Significance of Port Security in Singapore. II.   The Threat Posed by Small Submersibles. III.  Vulnerability to Undersea Intrusion. IV.  Indirect Passive Sonar (InPaS) for Port Security. V.  InPaS Performance Analysis. VI.  Role of acoustic propagation modeling. VII.  Concluding remarks. Outline of Presentation Economic Consequences of Singapore Port Security:  Economic Consequences of Singapore Port Security Malacca & Singapore Straits -> 60000 ships/year this is more than half of the world's merchant fleet capacity. 80% of oil to North Asia passes through the Straits 1/3 of world trade dollars pass through the Straits. If Singapore port/harbor is attacked and closed, impact on world trade is more than $200B (US) per year just counting the impact of disruption to inventory and production cycle. Lloyd’s of London lists the Malacca Straits as a war-risk area … “until such time as they are satisfied that the littoral states were doing more to provide security in the Strait”. In littorals, above-sea surveillance more developed than underwater surveillance. Slide4:  USS Cole, Oct. 2000 “Terrorist attack at major US port could cause $1 Trillion damages” -Brookings Institute, 2003 “Navy should conduct a design study for a broad area ocean surveillance system that uses low frequency and broadband acoustics, in concert with fusing data from all-source cooperative vessel tracking systems, to allow for surface vessel location, identification, and tracking and for cueing of sealaunched cruise missile tracking systems.” -Defense Science Board (US) 2003 Study on Roles of DoD in Homeland Security “Mini Submarine-A Vessel of Choice with Drug Cartels and Terrorists” -Vijay Sakhuja , Research Fellow, Observer Research Foundation (India) May 2005 Submersible Threats in the News Slide5:  U.S. National Strategy for Maritime Security Needs for Maximizing Domain Awareness: Sensor technology, human intelligence collection, and information processing tools to persistently monitor the maritime domain; Shared situational awareness to disseminate information to users at all levels; Automated tools to improve data fusion, analysis, and management in order to systematically track large quantities of data, and to detect, fuse, and analyze aberrant patterns of activity – consistent with the information privacy and other legal rights of Americans; and In order to advance to the next level of threat detection, transformational research and development programs in information fusion and analysis – these programs will develop the next qualitative level of capability for detection threats. Slide7:  Submersible Detection – Active Sonar Benefits: Control of signal band. Direct access to range and azimuth. Matched filter gain. Drawbacks: Two-way transmission loss Large power requirement. Negative impact on marine mammals. Source position and intention visible to all. TL AG TL2 AG TL1 Slide8:  Submersible Detection – Passive Sonar Benefits: Minimal power requirement. Minimal impact on marine mammals. Clandestine surveillance. Drawbacks: No range information. Mini-submersibles and divers are very quiet with respect to ambient. No matched filter gain. Acoustic Source Levels:  Acoustic Source Levels Arveson averaged ship power spectrum over various operational speeds. Wales averaged ship power spectrum over various types of ships. AUV is SOC Autosub. Ambient noise measured in Singapore Keppel Harbor. Cargo ship source levels are 50 dB greater than submersible source level. 50 dB 70 dB Slide10:  Signal Loss from Source-Target + Target Scattering Assumes the target traverses between two ships spaced by 1 km. Target size on the order of 1.5 m diameter. The 30 dB loss value indicates that given sufficient array gain, there is sufficient signal for detection to be made. Sufficient signal level is not the whole story… Relevant Aspects of the Singapore Port Areas:  Relevant Aspects of the Singapore Port Areas Heavy ship traffic Many large merchant ships Very shallow water Strong transmission loss Variable sound speed profiles Well-instrumented area Large ship positions well known Bathymetry well mapped 1 km Slide12:  Submersible Detection – Indirect Passive Sonar Benefits: Uses cargo ships as sources of opportunity. Relative ranges can be estimated from known ship and receiver positions. Some matched filter gain available. Minimal power requirement – low freq, long range source available. Drawbacks: Possible to have no sources of opportunity (unlikely in busy shipping lanes) Ship signal is correlated to target scattered signal, and in similar arrival angle. Slide13:  Δφ Source Target Target Detection Methodology Reception Coherent Portion Incoherent Portion MVDR/MLSE Beamformer Correl./Cepstrum Echo Detector Detection Tracking Tracking Slide14:  InPaS Performance – as a function of source-target correlation Correlation coefficient Correlation coefficient Probability of detection Angle estimation error Slide15:  InPaS Performance – False Alarm Probability vs. Observation Time As number of snapshots increases, the performance improves for given detection threshold. False alarm probability drops suddenly when detections go to zero. Probability of False Alarm Detection Threshold Increasing # snapshots Detection probability->0 Slide16:  broadside source Probability of Detection Angular Estimation InPaS Performance – Determining Sufficient Signal Levels Slide17:  InPaS Performance – Determining Sufficient Angular Separation Singapore Keppel Harbor (SKH):  Singapore Keppel Harbor (SKH) Green paths are ship traversal paths. Red paths are port entry/exit. Submersible detection must occur in the green zone prior to arrival in red zone. SKH environment gridded as shown below. Slide19:  Green zones are preferred receiver locations. Arrays stay outside of direct shipping lanes, near barrier islands. Red gridded area is the source/target area. Target assumed equally likely to be anywhere in the grid. Availability of multiple sources, multiple receive angles. Array Layout for Domain Protection Slide20:  Shallow Water Acoustic Propagation – Temporal Variability Slide21:  The Synthetic Environment Acoustic Laboratory (SEALAB) Receivers Sources Environment Propagation Model Slide22:  Bathymetry Representations in SEALAB U.S. Mid-Atlantic Region Singapore Fairway Slide23:  Sonar Simulations in SEALAB Example Sonar Simulation – Singapore Fairway:  R Example Sonar Simulation – Singapore Fairway Run parameters Frequency = 1200 Hz Target depth = 11 m DT=AG=0 dB Color scale is -20 dB (blue) to 10 dB (red) Field of view partially blocked by barrier island. Conclusions:  Conclusions Undersea access methods to ports of call present a significant security challenge. Unique situation of the Singapore waterways (dense ship traffic, shallow water, well-instrumented area with “Eye in the Sky”) enables cargo ships to be exploited as acoustic sources of opportunity. InPaS can be used in conjunction with additional sensor modalities to detect threats entering the harbor. Pre-deployed fixed arrays can be placed for full area, full-time coverage of a desired waterway.

#mit presentations

77 cool things in 17 minutes
03. 08. 2015
0 views

77 cool things in 17 minutes

MITx - Week 1 - Peer Assessment
19. 10. 2014
0 views

MITx - Week 1 - Peer Assessment

MacWelt 7/2004
05. 06. 2014
0 views

MacWelt 7/2004

energysecurity
06. 02. 2008
0 views

energysecurity

Related presentations


Other presentations created by Mee12

08 Dog and Cat Nutrition
16. 11. 2007
0 views

08 Dog and Cat Nutrition

miguel angel bustamante
01. 10. 2007
0 views

miguel angel bustamante

Athens 2004
02. 10. 2007
0 views

Athens 2004

hauer1
27. 09. 2007
0 views

hauer1

aws
06. 11. 2007
0 views

aws

Chapters 9 10
26. 11. 2007
0 views

Chapters 9 10

ContinuousIntegration final
28. 11. 2007
0 views

ContinuousIntegration final

N A V I G T O R S VBB 2007
30. 11. 2007
0 views

N A V I G T O R S VBB 2007

Fruit Insects
01. 12. 2007
0 views

Fruit Insects

raghavachari
04. 12. 2007
0 views

raghavachari

Test Anxiety 1
06. 12. 2007
0 views

Test Anxiety 1

ProvidentialHistory
31. 10. 2007
0 views

ProvidentialHistory

chap08 og
01. 11. 2007
0 views

chap08 og

handout 184637
05. 11. 2007
0 views

handout 184637

2004 harm present
05. 11. 2007
0 views

2004 harm present

E DESC AK PACOM POL CONF ver31
13. 11. 2007
0 views

E DESC AK PACOM POL CONF ver31

bedeutung innovation
15. 11. 2007
0 views

bedeutung innovation

Parity01 grames slides
23. 11. 2007
0 views

Parity01 grames slides

GA Conf07Lomas
13. 12. 2007
0 views

GA Conf07Lomas

CooperativeLearning
17. 12. 2007
0 views

CooperativeLearning

Friendship 1
23. 12. 2007
0 views

Friendship 1

plant lifecycles
28. 12. 2007
0 views

plant lifecycles

Millay
28. 12. 2007
0 views

Millay

alterman pki 05 13 01
01. 01. 2008
0 views

alterman pki 05 13 01

RMA 2005
02. 01. 2008
0 views

RMA 2005

OH
04. 01. 2008
0 views

OH

pp Bioeconomy Polansky Dec2007
04. 01. 2008
0 views

pp Bioeconomy Polansky Dec2007

nazca lines
07. 01. 2008
0 views

nazca lines

4330IBS
30. 10. 2007
0 views

4330IBS

Wk4 Mon
04. 01. 2008
0 views

Wk4 Mon

lh1
21. 11. 2007
0 views

lh1

econ and mgnt of privatization
20. 11. 2007
0 views

econ and mgnt of privatization

EE541 451 class29
28. 11. 2007
0 views

EE541 451 class29

Aquatic Equipment
08. 11. 2007
0 views

Aquatic Equipment

WomensEmploymentJan2 001
24. 02. 2008
0 views

WomensEmploymentJan2 001

1025 QM05 Nardi
29. 10. 2007
0 views

1025 QM05 Nardi

wendybear
24. 12. 2007
0 views

wendybear

Martinac
14. 03. 2008
0 views

Martinac

DynaMed
25. 10. 2007
0 views

DynaMed

IntStu
27. 03. 2008
0 views

IntStu

Country Risk Sep07
13. 04. 2008
0 views

Country Risk Sep07

Eco 336 Constitutional Limits on
17. 12. 2007
0 views

Eco 336 Constitutional Limits on

2003 lecture crypto1
31. 12. 2007
0 views

2003 lecture crypto1

robo lectures
14. 11. 2007
0 views

robo lectures

Ders1
29. 12. 2007
0 views

Ders1

REDLOBSTER
07. 12. 2007
0 views

REDLOBSTER

WarmUps WHII
25. 12. 2007
0 views

WarmUps WHII

pres riccardo
30. 10. 2007
0 views

pres riccardo

Chapt3overhead
12. 11. 2007
0 views

Chapt3overhead

SHFA280301
28. 11. 2007
0 views

SHFA280301

IfA jan03v1
15. 11. 2007
0 views

IfA jan03v1