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If FOM < TL, what does that tell us about probability of detection?
Less than 50% probability
If FOM > TL, what does that tell us about probability of detection?
Greater than 50% probability
What does FOM help to predict?
Range
Higher FOM = ?
Greater detection range
What is directivity index?
SONAR’s ability to block out sounds coming from directions other than the direction of interest
What does a larger directivity index mean?
Improved detection/FOM
What is the definition of detection threshold?
Signal minus the nose required inboard of the hydrophone array for an operator using installed equipment to detect a target 50% of the time.
What does a smaller/more negative detection threshold mean?
Improved detection / FOM
How can we improve the FOM?
Look at the equation
Increase source level
Decrease noise level
Increase directivity index
Decrease detection threshold
