HELRAS
HELRAS or the Helicopter Long Range Active Sonar is a naval helicopter undersea sensor, a dipping sonar (a form of towed array sonar), deployed by helicopters of many naval air forces around the world to detect submarines; it is a form of geophysical MASINT.
History
HELRAS was first developed in the 1970s by Bendix, FIAR and British Aerospace.[1] Another rival system was called FLASH (Folding Light Acoustic System for Helicopters). In the 1980s, the system was supplied by Bendix.[2]
A competitor of HELRAS is the Low Frequency Active Sonar (LFAS).
Capability
It can detect submarines up to 60NM.[3]
Manufacture
Parts for the system are made by Rolls-Royce North America.[4]
Deployment
The system has been fitted to EH101, S70B, NH90, CH-148, AS532SC, AB412, and AS565 with helicopter of navies such as Italy, Turkey, Greece, Netherlands, Canada, Singapore, Thailand, Chile, Brazil, Indonesia, and Morocco. The system has also been fitted to unmanned surface vessels Seagull and RHIBs for Israel and USN.
See also
- AN/SQQ-89
- HIDAS, made by Selex Galileo[5]
- Light Airborne Multi-Purpose System
- Searchwater (radar), made by Thales UK
- SOSUS
- USHUS
References
- v
- t
- e
- 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
- 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 acoustic positioning system
- Underwater acoustics
- Underwater acoustic communication
- Underwater acoustic positioning system
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