Under certain conditions, as sonar sweeps an area, the pings and clicks could get trapped in a surface duct, making them less audible from below.
What does SD stand for?
SD stands for Surface Duct
This definition appears somewhat frequently
See other definitions of SD
We have 158 other meanings of SD in our Acronym Attic
- Super Dense
- Super Domain
- Super Dreadnought (naval and sci-fi space navy warship class)
- Super Duty (automobiles)
- Superdreadnought (Honor Harrington science fiction novels)
- Superior Defender (anime)
- Supplementary Declaration (trade)
- Supply Depot (Starcraft)
- Supply Duct
- Supporting Document