Use of sound speed in Simrad Ex60 and Ex500 calculations
Refer to this table for sound speed calculations for
|
Description |
|
|
c1 |
1470.0 |
|
c2 |
1470.6 |
|
c3 |
Per-ping sound speed stored in data file |
|
c4 |
User defined. Entered on the Calibration page of the Variable Properties dialog box (single setting) |
|
c5 |
User defined. Entered on the Calibration page of the Variable Properties dialog box ("logging" setting) |
|
c6 |
User defined. Entered on the Calibration page of the Variable Properties dialog box ("processing" setting) |
Note: c3 is not used.
The sound speed(s) used in variables derived from the following data files is documented below:
EK500: ek5, dgn, CSIRO raw, BI500 files
Sv (Q telegrams) and sample Sv (V telegrams)
TS (Q telegrams) and sample TS (P telegrams)
Single target detections (E telegrams)
Sv from Power (W telegrams)
TS from Power (W telegrams)
Angular position (B telegrams)
Sv (Q telegrams) and sample Sv (V telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each sample |
|
|
Adjusting the Sv value of each sample |
With no calibration correction
Not used
TS (Q telegrams) and sample TS (P telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each sample |
|
|
Adjusting the TS value of each sample |
With no calibration correction
Not used
Single target detections (E telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each target |
|
|
Adjusting the TS value of each target |
|
|
ST thickness calculation |
With no calibration correction
c5 used for ST thickness calculation
Sv from power (W telegrams)
|
Variant |
Sound speed calculation |
TS from power (W telegrams)
c1 used for TVG range correction
Angular position (B telegrams)
Not used
Ex60: raw files
Sv raw pings
TS raw pings
Angle position raw pings
Sv raw pings
|
Variant |
Sound speed calculation |
|
Converting time to range for each sample Note: Can use a SoundSpeed profile. |
|
|
Calculating wavelength from frequency (subsequently used in power to Sv equation) |
|
|
Power to Sv equation. Note: Can use a SoundSpeed profile. |
TS raw pings
|
Variant |
Sound speed calculation |
|
Converting time to range for each sample |
|
|
Calculating wavelength from frequency (subsequently used in power to TS equation) |
Angle position raw pings
c4 is used for converting time to range for each sample
Ex60: .DG files
Sv (Q telegrams)
Sample Sv (V telegrams)
TS (Q telegrams)
Sample TS (P telegrams)
Single target detections (E telegrams)
Sv from Power (W telegrams)
TS from Power (W telegrams)
Angular position (B telegrams)
Sv (Q telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each sample |
|
|
Adjusting the Sv value of each sample |
With no calibration correction
Not used
Sample Sv (V telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each sample |
|
|
Adjusting the Sv value of each sample |
|
|
Calculating sample height (subsequently used to calculate sample range) |
With no calibration correction
c4 is used for calculating sample height (subsequently used to calculate sample range)
TS (Q telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each sample |
|
|
Adjusting the TS value of each sample |
With no calibration correction
Not used
Sample TS (P telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each sample |
|
|
Adjusting the TS value of each sample |
|
|
Calculating sample height (subsequently used to calculate sample range) |
With no calibration correction
c4 is used for calculating sample height (subsequently used to calculate sample range)
Single target detections (E telegrams)
With calibration correction
|
Variant |
Sound speed calculation |
|
Adjusting the range of each target |
|
|
Adjusting the TS value of each target |
|
|
Calculating ST thickness |
With no calibration correction
c5 is used for single target thickness calculation
Sv from power (W telegrams)
|
Variant |
Sound speed calculation |
|
Sample height calculation (subsequently used to calculate sample range) |
TS from power (W telegrams)
|
Variant |
Sound speed calculation |
|
Sample height calculation (subsequently used to calculate sample range) |
Angular position (B telegrams)
c4 is used for calculating sample height (subsequently used to calculate sample range)