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Set TVG
When an acoustic pulse is sent through the water, it will gradually lose its energy. The
greater the distance between the Sonar Head and the target(s), the greater the loss of
energy.
TVG
(Time Variable Gain) compensates for the loss of acoustic energy due to
geometric spread and absorption.
Description
In the M3 software, the TVG parameters are set using the
TVG
button located
on the tool bar.
Each sonar application has its own TVG profile. If you wish to change the TVG
profile for a specific application, issue the
Set Mode
API command before the
Set TVG
command. Otherwise, the
Set TVG
command will configure the default sonar application.
Details
The TVG compensation is expressed as a logarithmic curve. You can choose from
a selection of curves. Each curve has a different slope creating a different gain
compensation. Four adjustable factors are used to set the gain curve.
Set TVG API
<Command>
<Operation>Set_TVG</Operation>
<TVG_A>20</TVG_A>
<TVG_B>100</TVG_B>
<TVG_C>-16</TVG_C>
<TVG_L>100</TVG_L>
</Command>
M3 Sonar API Instruction Manual
