Shallow Water Swath Bathymetry from Small Platforms. Advances in Seafloor Mapping Sonar, 30 Dec 2009 Systems Engineering & Assessment Ltd.

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1 Shallow Water Swath Bathymetry from Small Platforms Advances in Seafloor Mapping Sonar, 30 Dec 2009 Systems Engineering & Assessment Ltd.

2 Presentation Requirements, applications and challenges SWATHplus wide-swath sonar SWATHplus-SPLASH JetSWATH SWATHplus-RS100 AUV survey in shallow water AUTOsuite vehicle autonomy software Contacts Questions?

3 The Requirement Survey in <10m water depth, even <1m Inland and inshore Surf zone Rivers, lakes, beaches, very shallow sea areas Airborne laser systems don t work well in the last 5m or so: fill the gap between airborne land survey and marine survey Survey where tide range is small or non-existent (otherwise can use land survey or airborne systems at low tide)

4 Applications 1 Charting Cable & pipe route landings Oil & gas operations in very shallow water Beach studies protection, tourism Flood protection River surveys Environmental assessment

5 Applications 2 Scientific study; Geology, biotype assessments Marine archaeology Military Rapid Environmental Assessment (REA), e.g. supporting beach landings Mine Countermeasures (MCM) Special Forces Police & fire Search & rescue Property & evidence searches Homeland security IEDs Hull inspection Swimmer detection

6 Challenges Risk of grounding Rough water conditions; breaking surf Aeration in water Difficult access

7 Solutions Wide-swath sonar Small robust manned craft Autonomous & radio-controlled craft ASVs AUVs Road transportable, or deck-carried vehicles

8 SWATHplus swath bathymetry sonar SWATHplus interferometric swath bathymetry/imaging technology Sonar for collecting very wide swath, high-resolution bathymetry and side scan data For shallow water surveys up to 300m depth Phase Differencing (Interferometric) technology Portable or hull mounted Worldwide sales with systems currently operating in five continents

9 SWATHplus Components Pair of sonar transducers Transducer Interface Unit (TIU) Laptop computer Sonar control and data analysis software Transducer mounting kit

10 SWATHplus - compact Variants designed and built for specific applications: SWATHplus-SPLASH: open boats RS100: For the REMUS 100 AUV JetSWATH: Implementation onto a jet-ski for inshore and very shallow water applications ASVs AUVs

11 SWATHplus-SPLASH SWATHplus system in IP65 waterproof housing Can include auxiliary components: attitude, position, heading Separate waterproof and sunlight-readable touch-screen helmsman s display

12 JetSWATH Developed together with ITER, France Modified Bombardier jet ski (personal watercraft) Integrated SWATHplus swath bathymetry system Full range of position, motion, navigation and speed of sound sensors Aluminium hull designed for shallow surveys in tough environments Waterproof console situated at the craft s steering column Compact and portable: easy, rapid deployment

13 JetSWATH GPS Compass Rugged, waterproof touch-screen display and control interface Sound Velocity Profiler and 50 m cable reel Trailer for road transport and launch Hull in aluminium dedicated to shallow water surveys in tough environment SWATHplus 468 khz transducers (Port & stbd) integrated in the aluminium hull

14 JetSWATH Basic Configuration For medium-accuracy survey work in calm water, site inspection and search and rescue SWATHplus 468 khz sonar system DGPS position and heading system Basic INS motion sensor Sound velocity profiler, with 50 m cable reel, deployable by the rider High-Level Configuration For high-accuracy survey work, up to IHO S44 Special Order, with significant wave action SWATHplus 468 khz sonar system RTK-enabled position and heading system High-accuracy INS motion sensor Sound velocity profiler, with 50 m cable reel, deployable by the rider

15 High-Speed Transit

16 Survey Speed

17 Beach Landing

18 SWATHplus-RS100 High resolution bathymetry and sidescan for the REMUS 100 and Gavia autonomous underwater vehicles

19 RS100 Main System Components Underwater bottle, compatible with REMUS 100 Connecting cables Survey preparation and data analysis software

20 Shallow survey with AUVs Rapid setting to work: AUV is a self-contained unit Can reach places where surface vessels cannot go: e.g. close to platforms and underwater structures Surface vessel can continue its survey work whilst AUV is operating: costeffective Can optimise altitude and stand-off Can track pipelines and similar features Fine track control and short turns More stable than surface ships in poor weather

21 Typical Mission: Preparation Connect SWATHplus bottle to REMUS Check the ballasting to get a good buoyancy and trim

22 Typical Mission: Survey Preparation Plan REMUS survey track, based on swath coverage at the desired altitude Start with patch test calibration lines Remaining lines at minimal overlap: up to 150m Set RS100 sonar controls for the survey conditions Up-load to vehicle and RS100

23 Typical Mission: Survey Deploy the vehicle, and send Mission Start message by acoustic link Observe mission progress using the acoustic link Recover the vehicle at the end of the mission Upload and process the data

24 RS100-REMUS Data North Sea platform surveyed with RS100 on REMUS 100 Acknowledgement and thanks to Hydroid and NAM no product approval implied

25 RS100-REMUS Data Sidescan waterfall 3D surface Track plot

26 Autonomous Surface Vehicles AUTOsurvey Remote Survey Vessel SASS

27 Autonomous Mission Planning and Onboard Decision Making - AUTOsuite Survey vehicle autonomy for both manned and unmanned vehicles Planning / replanning / decision making engine. Used by the user interface and/or onboard the vehicle Simulation/prediction tool Integrated, tested and demonstrated on an AUV for MoD BAUUV programme Reduces operator workload. User draws goals on a chart. The tool provides detailed waypoints and sensor commands Improves vehicle endurance and reduces time to undertake a mission (through optimal transit planning and goal ordering) Minimises risk while optimising mission goal

28 Combined Imagery: Land & Water Combined swath bathymetry and above-water laser scanning All images courtesy of Codevintec Italy

29 contacts SWATHplus Enquiries / SEA Offshore Division Hardy Sidhu, Business Director / Matt Geen, Systems Design /