22 - Passive UW Systems & Towed Array SONAR Systems (TASS) Flashcards
1
Q
Difference of the Passive System?
A
Passive Systems must listen at all angles at all times
2
Q
Doppler Effects
A
UP Doppler - High Freq.; target is moving toward you
DOWN Doppler - Low Freq.; target is moving away from you
ZERO Doppler - No change in freq.; no relative motion
Doppler never lies
3
Q
What is a Transducer?
A
Converts one from of energy to another
- Hydrophone – Sound to electricity
- Projector – Electricity to sound
4
Q
Details about Cylindrical Array
A
Generally used on surface ships to provide horizontal steering “FWD and Down”
5
Q
Details about the Spherical Array
A
Generally used on subs to provide increased vertical beam steering
