Synthetic Aperture Sonar
Synthetic Aperture Sonar Synthetic Aperture Sonar
- Page 2: MUSCLE technology testbed• COTS B
- Page 5 and 6: 5Dolia Shipwreck Survey2000 Year Ol
- Page 8 and 9: 8Model-based classification
- Page 10 and 11: 10Bathymetric map
- Page 12 and 13: Exercise results “MUSCLEArea SAre
- Page 14 and 15: Imaging target internal structure w
MUSCLE technology testbed• COTS Bluefin 21 platform with WiFi, RF andAcomms. L=3m50.• 270-330 kHz wideband InSAS optimized forshallow water (Thales)• 0.2% distance travelled aided inertialnavigation (IMU 120 IxSea)• On-board processing capability, preprogrammed& adaptive mission planning
MicronavigationDPCA concept4Wideband sonarOptimal fusionInertial navigation
5Dolia Shipwreck Survey2000 Year Old Cargo
Partnering forMaritimeWater depth 20 mAltitude 15 mBottom type : mud
8Model-based classification
Grazing angle estimation using widebandinterferometric sonar• Two vertically superposedlinear arrays separated bymany wavelengths (=19 forMUSCLE).• High accuracy local grazingangle estimation based ontime delay estimation• Similar to DPCA: physicalacross-track interferometerin place of synthetic alongtrackinterferometer.9
10Bathymetric map
Exercise results of existing unitsArea SArea D11
Exercise results “MUSCLEArea SArea D12
12Multi-view SAS imagery141618202213
Imaging target internal structure withHF&LF SASFiberglassWaterSolidifiedResinFiberglass1.5 mSecond echo from backsideof water-filled endcap.300kHz absorbed by resin.Backside would be visible inLF….14
Conclusions• Significant advances have been achieved inhigh resolution sonar in the last 10 years– Wideband technology– Long baseline interferometry– <strong>Synthetic</strong> <strong>Aperture</strong> <strong>Sonar</strong>– Non-traditional navigation• There are still some promising areas for thefuture– Multi-view SAS imagery– Bi-band SAS for imaging inside targets.15
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