A sound velocity profile (SVP) records the speed of sound at various depths in the water column. HIPS lets you apply SVP data in sound velocity corrections, but not for all types of sonars because some sonar data logging systems compensate for sound velocity during data acquisition.
To ensure the SVP is accurately applied in HIPS, the transducer X-Y-Z offset values must be entered.
1. Click SVP 1 in the Sensors list box.
The selection is highlighted and the SVP transducer data fields are visible. If there is a second transducer then click SVP 2 and complete the same procedures as listed below.
2. Type data as needed in the following fields:
• Date: The year and Julian day of the current SVP pole time stamp.
• Time: The hour and minute of the current SVP pole time stamp.
3. Select Yes if there are dual transducers or No if there is only a single transducer.
The following three fields are for entering the X-Y-Z coordinates of the pole. All coordinates are measured from the Reference Point.
4. Type the transducer’s X-Y-Z offsets in the following fields:
• X: The athwart-ship distance of the transducer, positive to starboard.
• Y: The along-ship distance of the transducer, positive to the bow.
• Z: The vertical distance of the transducer, positive into the water.
The Reference Point for Kongsberg data is the centre of rotation. It should be possible to retrieve offset values from the Kongsberg Installation Datagram. |
The next fields refer to the alignment of the transducer. The values you entered in the wizard when creating the HVF are displayed in these fields. The fields are only to be used for large transducer mounting offsets.
• Pitch: Pitch offsets of the transducer.
• Roll: Roll offsets of the transducer.
• Yaw: Rotation of the transducer (either 0 or 180 degrees).
For information on setting the sound velocity corrections, see Sound Velocity Corrections.