Sonar image of the wreck of USS O-9.
The target strength or acoustic size is a measure of the reflection coefficient of a sonar target. This is usually quantified as a number of negative decibels. For fish such as salmon, the target size varies with the length of the fish and a 5 cm fish would have a target size of about -50 db.[1]
Target strength (TS) is equal to 10 log10(σbs), where σbs is the backscattering cross section.
References[]
- ↑ J.E. Ehrenberg (1989). "Underwater Acoustic Data Processing". Springer. http://books.google.co.uk/books?id=tAP3zn0TtkkC&pg=PA161.
Further reading[]
- "Introduction to the use of sonar systems for estimating fish biomass, FAO Fisheries Technical Paper No. 191, Revision 1, FAO 1982"
- Fisheries Acoustics Simmonds, E John and MacLennan, David N (2005) Blackwell Publishing. ISBN 978-0-632-05994-2
- C. S. Clay & H. Medwin, Acoustical Oceanography (Wiley, New York, 1977)
The original article can be found at Target strength and the edit history here.