Type Conversion
This operator converts a variable from one type to another type, e.g. Sv to unspecified dB.
Echoview accepts a single operand of the following data types as input:
-
Complex power dB
-
Complex Sv
-
Complex TS
-
Multibeam Sv
-
Multibeam TS
-
Multibeam unspecified dB
-
Power dB
-
Pulse compressed complex power dB
-
Pulse compressed complex Sv
-
Pulse compressed complex TS
-
Sv
-
Target length
-
TS
-
Unspecified dB
Settings
The Type Conversion Variable Properties dialog box pages include (common) Variable Properties pages and these operator pages:
Operands page
Type Conversion page
The Type Conversion page is displayed on the Variable Properties dialog box if the Type Conversion operator or the Sv to TS or TS to Sv operator has been applied to create the selected virtual variable.
|
Setting |
Description |
|
Output type |
Choose a conversion type from the list. The operand variable will be changed to the nominated output type. |
|
Calibration difference offset |
A transducer constant quantity required by the equations used by the TS to Sv or Sv to TS operator. The Calibration difference offset represents the value for (CSv -CTS) and is used when CSv and/or CTS are unavailable from the data or calibration settings. For information on how to estimate this value refer to the Sv to TS algorithm. |
Notes:
- During the type conversion operation, wideband pulse compressed data incorrectly uses the uncompressed pulse length, as the conversion means that it no longer has awareness of the input data being pulse compressed. This should be corrected by supplying a LocalCal EffectivePulseDuration value for the virtual variable, where you should enter the value that's used for PulseCompressedEffectivePulseDuration in operand 1.
- See also: The Effect of No data samples on the Wideband Frequency Response graph page.