Creating single target detection variables from single-beam data

To create a single target detection virtual variable from single beam data:

  1. Open the Dataflow window.

  2. On the Shortcut (right-click) menu, click New then Variable to display the New variable dialog box.

  3. On the New Variables dialog box:

    1. In the Name box, enter a name for the single target virtual variable.
    2. In the Operator group list, select Single target detection operators.
    3. In the Operator list, select a single-beam single target detection operator.

  4. Click OK to display the Variable Properties dialog box.

  5. On the Operands page, in the Operand 1 list, select a TS variable.

  6. Click the Single Target Detection tab.

  7. On the Single Target Detection page:

    1. In the Single target detection parameters section, enter required single target detection settings, see Single target detection (single beam method 1) or Single target detection (single beam method 2) for more information.
    2. In the Exclusion section, select exclusion lines (if required).

Note: This page contains default settings to begin with. If the resulting echogram does not contain as many single targets as you expect, relax some of the contraints on this page. See Tuning single target detection algorithms for more information.

  1. Click the Calibration tab.

  2. On the Calibration page:

    1. In the Transducer list, select the transducer from which transducer geometry will be applied.
    2. In the remaining boxes, enter required single target variable calibration settings.

      Note:       Virtual variables inherit some settings from their operand(s), see Inheritance of properties for more information.

  3. Click the Data tab.

  4. On the Data page:

    1. In the Minimum threshold section and Maximum threshold section, select the desired options (if any) and enter threshold settings.
    2. In the Filter single targets section, select the desired options (if any) and enter filter settings.

  5. Click OK.

To display the single target virtual variable you created; on the Dataflow window, double-click the new virtual variable.

Note: TVG and TVG range correction can affect the suitablity of an Echoview single target detection method for your data. For more information refer to:

See also

About single target detection
Single target detection algorithms
Simrad and Echoview single target detection terminology

Echoview Help file 5.1.25 for Echoview 5.1.45 Wednesday 1st  February 2012

Please report any errors or omissions to support@echoview.com.