Quote:
Originally Posted by shipkiller1
To follow up and clarify this '3D'.
Submarine sonar systems determine not just the bearing (angle in the X axis) of the energy source but also the angle in the Y-axis. This is accomplished by Beam-forming.
You can read about it here in a unclassified PDF.
http://www.dtic.mil/dtic/tr/fulltext/u2/a250189.pdf |
This can be done in a spherical array, but not via a hull array or towed array.
No one in the 60s or 80s used vertical angles for anything. All displays were strictly bearing. Vertical info was inferred from layers or operational.
Edit: the earliest spherical array beamforming was done by connecting each transducer to a physical spherical set of contacts with a cap-like receiver that fit over it. You physically maneuvered the cap to where the signal was strongest. The cap was constructed so that the center contacts had a delay on them, with the delay dropping to zero at the edges [I think that's right, but if it isn't then it's the other way], so that what you were doing was finding where the signals matched what a sound wave would do as it passed over the spherical array.