Knowledgebase
GeoAcoustics GeoSwath
Posted by Jerry Knisley, Last modified by
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on 09 December 2014 01:59 PM

HYSWEEP driver for the GeoSwath multibeam / sidescan device.  Provides multibeam soundings, beam intensity values and sidescan imagery.

 

Setup Form:

Each ping, the GeoSwath sends thousands of range / angle / amplitude samples to HYSWEEP survey.  These are reduced to a manageable number of beams in HYSWEEP Survey using the filtering and downsampling routines available in the HYSWEEP Interferometry window (See Appendix C).

 

RDF format files can be logged alongside HSX by checking the “Record Raw Message” option on the Connect tab.

 

Connection:

All data is via a network interface. Internet address can be left as 127.0.0.1. Use network port 5001. In 2010, the filtering features from the IFFilter program are built into HYSWEEP so this program is no longer needed for real-time operation.

 

Offsets - MRU:

  • Starboard:  MRU location starboard of boat reference.
  • Forward: MRU location forward of boat reference.
  • Vertical: MRU location relative to waterline (positive below).
  • Yaw, Pitch, Roll: Enter MRU calibration offsets if not enetered elsewhere.
  • Latency:  Enter 0.

 

Offsets - Gyro:

  • Starboard, Forward, Vertical: Enter 0.
  • Yaw: Typically 0.
  • Pitch, Roll, Latency:  Enter 0.

 

Offsets – Sonar Heads 1 and 2:

  • Starboard:  Sonar head locations starboard of boat reference.
  • Forward: Sonar head locations forward of boat reference.
  • Vertical: Sonar head locations relative to waterline (positive).
  • Yaw, Pitch, Roll:  Sonar head rotations - enter values determined by patch testing.
  • Latency:  Enter 0.

 

Notes:

  • Two computers are required; One runs GeoSwath +, which is the control program.  The other runs HYPACK / HYSWEEP.  Communication is over the Ethernet cable.
  • The computers must be time synchronized.  This is done by time synchronizing both to GPS time (requiring a HYPACK 1PPS box).
  • in HYSWEEP 10.0.13 and later, the driver supports the 500kHz GeoSwath as well. It will attempt to detect the frequency, but you can force this mode by setting Geo500kHz=1 in the section for the GeoSwath of your HYSWEEP.ini.