Synthetic aperture sonar

Short description: Form of sonar using post-processing of sonar data

A SAS image of the wreck of the West Ridge

Synthetic aperture sonar (SAS) is a form of sonar in which sophisticated post-processing of sonar data is used in ways closely analogous to synthetic aperture radar. Synthetic aperture sonars combine a number of acoustic pings to form an image with much higher along-track resolution than conventional sonars. The along-track resolution can approach half the length of one sonar element, though is downward limited by 1/4 wavelength. The principle of synthetic aperture sonar is to move the sonar while illuminating the same spot on the sea floor with several pings. When moving along a straight line, those pings that have the image position within the beamwidth constitute the synthetic array. By coherent reorganization of the data from all the pings, a synthetic aperture image is produced with improved along-track resolution. In contrast to conventional side-scan sonar, SAS processing provides range-independent along-track resolution. At maximum range the resolution can be magnitudes better than that of side-scan sonars.

A 2013 technology review [1] with examples and future trends is also available. For academics, the IEEE Journal of Oceanic Engineering article: Synthetic Aperture Sonar, A Review of Current Status[2] gives an overview of the history and an extensive list of references for the community achievements up to 2009.

## See also

* beamforming
* phased array
* side-scan sonar
* sonar
* underwater acoustics

## References

1. ↑ R. E. Hansen, Synthetic Aperture Sonar Technology Review, Marine Technology Society Journal, Volume 47, Number 5, September/October 2013, pp. 117-127 [1]
2. ↑ M. P. Hayes and P. T. Gough, Synthetic Aperture Sonar: A Review of Current Status, IEEE J. Ocean. Eng., vol. 34, no. 3, pp. 207-224, July 2009. Access abstract.

## External links

* KRAKEN MINSAS for AUV's
* KRAKEN INSAS for AUV's
* KRAKEN Actively Stabilized SAS Towfish - KATFISH
* iXBlue - SAMS-DT6000
* Kongsberg - Hisas
* Raytheon Applied Signal Technology - HD Sonar

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* t
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Hydroacoustics

Sonar|

* Active acoustics
* Baffles (submarine)
* Bistatic sonar
* Echo sounding
* Fessenden oscillator
* GLORIA sidescan sonar
* Multibeam echosounder
* Passive acoustics
* Scientific echosounder
* Side-scan sonar
* Sonar beamforming
* Sonobuoy
* Surveillance Towed Array Sensor System
* Synthetic aperture sonar
* Towed array sonar
* Upward looking sonar

Ocean acoustics|

* Acoustic network
* Acoustic release
* Acoustic Doppler current profiler
* Acoustic seabed classification
* Acoustical oceanography
* Hydrophone
* Long baseline acoustic positioning system
* Ocean acoustic tomography
* Short baseline acoustic positioning system
* Sofar bomb
* SOFAR channel
* Sound speed gradient
* Sound velocity probe
* Ultra-short baseline
* Underwater acoustics
* Underwater acoustic communication
* Underwater acoustic positioning system

Acoustic ecology|

* Acoustic survey in fishing
* Acoustic tag
* Animal echolocation
* Beached whale
* Deep scattering layer
* Fishfinder
* Fisheries acoustics
* Hearing range of marine mammals
* Marine mammals and sonar
* Whale song

Related topics|

* Acoustic signature
* Bioacoustics
* Biophony
* Geophysical MASINT
* Hydrographic survey
* Noise map
* Soundscape

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