underwater sonar communication
1Underwater acoustic communication — is a technique of sending and receiving message below water. There are several ways of doing such communication but the most common is using hydrophones. Under water communication is difficult due to factors like multi path propagation, time… …
2Underwater searches — are procedures carried out by divers in order to find a known or suspected target object or objects in a specified search area under water. There are a number of techniques in general use by Commercial, Scientific, Public service, Military, and… …
3Underwater archaeology — is the study of past human life, behaviours and cultures using the physical remains found in salt or fresh water or buried beneath water logged sedimentMuckelroy, K., Maritime archaeology. Cambridge University Press 1978. ISBN 0 521 29348 0] . It …
4Communication with submarines — is difficult because radio waves do not travel well through thick electrical conductors like salt water. The obvious solution is to surface and raise an antenna above the water, then use ordinary radio transmissions. Early submarines had to… …
5Underwater acoustics — The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.HistoryUnderwater sound… …
6Sonar — This article is about underwater sound propagation. For atmospheric sounding, see SODAR. For other uses, see Sonar (disambiguation) …
7sonar — /soh nahr/, n. 1. a method for detecting and locating objects submerged in water by echolocation. 2. the apparatus used in sonar. Also called, Brit., asdic. [1940 45; so(und) na(vigation) r(anging)] * * * Technique for detecting and determining… …
8Thales Underwater Systems — (TUS), formerly known as Thomson Marconi Sonar, is an international defence manufacturer specialising in sonar systems for submarines and surface warships, and airborne sonar systems as well as communications masts and systems for submarines. TUS …
9Thomson Marconi Sonar — Infobox Defunct Company company name = Thomson Marconi Sonar Ltd. company fate = Renamed Thales Underwater Systems foundation = 1990 defunct = October 2001 location = Weybridge, United Kingdom successor = Thales Underwater SystemsThomson Marconi… …
10human sonar hypothesis of auditory hallucinations — The term human sonar is indebted to the acronym sonar, which stands for SOund NAvigation Ranging. The term sonar, introduced in 1963 by the Allied Submarine Detection Investigation Committee (ASDIC), denotes the echo sounding technique… …
