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/ 1 /August 21, 2014 New High Resolution deep water multibeam The system sets a new standard by introducing new technology for 4th Generation multibeam.

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Presentation on theme: "/ 1 /August 21, 2014 New High Resolution deep water multibeam The system sets a new standard by introducing new technology for 4th Generation multibeam."— Presentation transcript:

1 / 1 /August 21, 2014 New High Resolution deep water multibeam The system sets a new standard by introducing new technology for 4th Generation multibeam. Replaces EM 120 Easy upgrade path for EM 120 customers, by change of TRU only. Same transducer arrays. Extends the coverage by 25% compared to EM 120. SIS Operator station using 3D graphics running under Windows and Linux EM 122 System diagram

2 / 2 /August 21, 2014 EM Ordered and delivered deep sea systems EM systems delivered Customers include IFREMER, SHOM, NERC, CSIC….. EM systems delivered Customers include BAS, Scripps, SHOM, NSF, UoHawaii, NERC, German Univ….. EM 122 – 29 systems delivered, 25 systems in operation Customers include NAVOCEANO, DOF, UoStockholm, Fugro, IFREMER, UTEC, EGS, Germany Univ….

3 / 3 /August 21, 2014 EM 122 Specifications – Frequency and range Frequency:12 kHz (10.5 – 13 kHz) Range:20 to 11000m Max swath width:30 km (-30dB) 6x water depth (down to 4000m) 150 degrees angular coverage sector Range sample rate: >2 kHz (37 cm) Pingrate:Maximum 5 Hz, mainly limited by the round trip travel time in the water. Mammal protection:”Ramping up” TX power

4 / 4 /August 21, 2014 EM 122 Specifications – Frequency and range Corrections for doppler shift The long FM pulse used by EM 122 are more sensitive than CW pulses to doppler shift caused by movements of the survey vessel. Therefore active corrections are required during the signal processing. Coverage for a 0.5x1 degree system

5 / 5 /August 21, 2014 EM 122 Specifications – Swath width vs Depth

6 / 6 /August 21, 2014 No of beams and soundings System version0.5x1 & 1 x11x22x22x4 No of beams/swath No of soundings per swath No of swaths per ping2211 No of soundings per ping EM 122 Beams and transmission pattern

7 / 7 /August 21, 2014 Water column display as a standard Data collection as option. 140 dB dynamic range receivers allowing different gains for water column and bottom simultaneously. No TVG is added in the receiver but added afterwards to compensate for different transmitter pulses (CW, FM). Display and logging with correct gain EM 122 Focusing and water column

8 821-Aug meter across 62/61º coverage EM 122 – 1x1 degree Courtesy of NAVO

9 921-Aug-14 Courtesy of NAVO EM 122 – 1x1 degree

10 1021-Aug-14 EM 122 – 1x1 degree Seabed image overlay Water depth 95–710 m

11 / 11 /August 21, 2014 EM 122 – 1x1 degree Waterfall display


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