Configuring Trawl Positioning System

When you have a system with door spread sensors with position data or slant ranges, you need to complete the positioning page to get accurate measurements of the door positioning.

Before you begin

  • Door sensors are already added and configured.
Tip: A spreadsheet is available on Marport support website to help you complete this page: go to the Useful Resources page.

Procedure

  1. From the left side of the screen where the system is displayed, click Positioning.
    The positioning configuration page appears.
    The page is different depending on the receiver firmware version:
    Figure 1. Receiver firmware below version 08.01
    Figure 2. Receiver firmware from version 08.01
  2. In Baseline, enter the baseline distance and the misalignment angles:
    1. Enter the distance between the two receiving hydrophones in Baseline length.
    2. Receiver firmware below version 08.01: You can complete the misalignment X and Z, for more accurate positioning. See Calculations for Positioning System. Otherwise, you can enter 0. Enter 0 for the misalignment Y.
    3. Receiver firmware from version 08.01: Enter the misalignment angle shown on the drawing.
    Note: The baseline is very important to have accurate positions of the doors.
  3. Receiver firmware below version 08.01: In Lever Arm, leave 0 in the fields.
  4. In Inputs, enter the port and starboard hydrophones, according to the hydrophone configuration.
    Note: If you have not given a port/starboard location to hydrophones when configuring them, you need to go back to hydrophone configuration page.
  5. Receiver firmware below version 08.01: In Algorithm, select Compensate if you entered misalignment values in Baseline.
  6. Click Apply.