Are my Single target detection results affected?
Given your data and the type of Single target detection method used, the legend below will identify whether your Single target detection results are affected.
No, not affected
|
Unaffected combinations of data and Single target detection method are identified by a green background. Such combinations are recommended. It is assumed that default settings are used for the data and algorithms. Variations from default settings are assumed to be have been applied correctly. |
Might not be affected
| Combinations of data and Single target detection method that might be unaffected and could be recommended under specific conditions are identified by a pink background. |
Yes, affected
| Affected combinations of data and Single target detection method that are also not recommended are identified by a white background. |
Data |
Single target detection Method 1 |
Single target detection Method 2 |
Simrad Ex500 sample data:
|
Recommended. |
Not recommended. However, it is possible to use this combination under the following conditions. Only if TVG range correction is not applied to the input TS variable, or if any applied correction is accounted for in the Method 2 operator settings.* |
|---|---|---|
Simrad Ex60 data:
|
Not recommended. However, it is possible to use this combination under the following condition. Only if a TVG range correction is applied to the input TS variable.** |
Recommended. |
Simrad EK80 data |
NA for pulse compressed wideband data. Not recommended for continuous wave data. |
Recommended. |
BioSonics:
|
Not recommended.*** |
Recommended. |
Sonic formats
|
Not recommended.*** |
Recommended. |
HAC format and text data formats |
Might be unaffected. Dependent on the original data source. Recommended with the condition: Only if TVG range correction has been applied to the input TS variable.**** |
Might be unaffected. Dependent on the original data source. Recommended with the condition: Only if TVG range correction is not applied to the input TS variable.**** |
Raw data from other echosounders
|
Not recommended.*** |
Recommended. |
* EK500 TVG range correction is applied by default but can be turned off for TS W datagrams from an Ex500. It is embedded in TS P datagrams from an Ex500.
** EK60 TVG range correction is turned off by default for TS raw pings and TS W datagrams from an Ex60. It can optionally be applied to those datagrams. It is not embedded in TS P datagrams from an Ex60, and cannot be applied in Echoview.
*** Echoview does not allow for application of TVG range correction in these TS data. TVG range correction is required for use of the Method 1 algorithm with BioSonics data, Sonic data or other raw data formats where TVG is calculated and applied by Echoview.
Note: The error introduced by using no range correction with the single target detection - dual beam (method 1) algorithm is of the same order as that introduced by using the single target detection (method 1) algorithm.
**** This correction cannot be applied in Echoview, but it is possible that a correction has already been embedded in the input TS data prior to its import to Echoview.
Notes:
- The Method 1 algorithm is the algorithm implemented+ in Echoview for Ex500 echosounders and should yield an almost perfect match with E datagrams from an Ex500.
- The Method 2 algorithm is based on the algorithm implemented in the Ex60 echosounders and should yield a good match with E datagrams from an Ex60.
- With appropriate TVG range corrections the Method 1 and 2 algorithms are valid with data from other supported echosounders#. See also Single target detection algorithms.
- A TVG range correction setting for the Biosonics and Sonic data formats is included in Echoview 4.40 and higher.
- A single target detection - dual beam method 2 algorithm is included in Echoview 4.40 and higher.
Return to TVG range correction overview
+Soule M., Barange M., Solli H. and Hampton I. (1997) Performance of a new phase algorithm for discriminating between single and overlapping echoes in a split-beam echosounder. ICES Journal of Marine Science, 54: 934-938.
#There is a choice of beam compensation model in Echoview. Please contact (support@echoview.com) if you any questions regarding the beam compensation for your data.
See also