Attachment C_R.B23636.001.02.SEMP_final_lowres

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2.1 Edgetech 6205 Multiphase Echosounder
The swath mapping sonar used for the survey was an Edgetech 6205 (ET6205) Multiphase
Echo Sounder (MPES). The ET6205 produces real-time, high resolution, three dimensional
maps of the seafloor whilst providing co-registered simultaneous dual frequency side scan
imagery.
For the bathymetry, the ET6205 uses ten receive element transducers and one discrete
transmit element. The high number of channels enables superior rejection of multipath
effects, reverberation and acoustic noise commonly encountered in the shallow water survey
environment. The frequency of the bathymetry channels is 550kHz with an effective “beam”
size of 1º x 1º.




                           Figure 2: Edgetech 6205 transducer head



The sidescan sonar imagery is spread across 4 channels of information: 2 channels at
230kHz and 2 channels at 550kHz. The lower frequency channels provide more information
on seabed types whereas the higher frequency channels are better for object / feature
detection.
An AML Micro-X Sound Velocity Sensor (SVS) at the head of the sonar provided sound
velocity information required for beam steering on a per ping basis. The Micro-X has
capabilities for measuring sound velocity ranges from 1375 m/s to 1625 m/s at an accuracy of
0.025 m/s.



2.2 Applanix POS MV Wavemaster
The Positioning and Orientation solution for this project was an Applanix POS MV
Wavemaster consisting of a small form factor (SFF) POS Control System (PCS) with IP68
water submersible Titanium sealed IMU and a pair of Trimble antennas.




                      Figure 3: Applanix POS MV Wavemaster components.




6                            Noosa Council - Noosa River Survey                   20.06.2019