Sentinel sonar head
Intruder detection sonar
Engineered for: Diver
Used a part of a Sentinel underwater security installation, a Sentinel sonar head provides wide-area coverage detection, tracking and classification of underwater threats.
At a glance
Man-portable, easy and quick to deploy
Up to 900 metre diver detection range; up to 1,200 m UUV detection range
Choice of housing materials to suit deployment scenarios and environmental conditions
Environmentally friendly low 206 dB re 1 µPa @ 1 m source level
360 degree coverage; segmentable into 45 degree sectors e.g for deployment against a harbour wall
Integrated attitude and heading reference sensor to compensate for movement
360 degree, long range detection
Want to know more?
The sonar head has a wide bandwidth transmission capability, centred by default on 70 kHz with a bandwidth in excess of 20 kHz.
Source level for the default transmission is 206 dB re 1 µPa @ 1 m. 8 separate 45° transmit sectors are used, which are individually addressable, allowing any segment to be disabled to reduced nuisance acoustic returns from close in objects such as harbour walls or jetties.
The transmitters themselves are fully programmable and supplied with a number of frequency modulated Doppler tolerant pulses that can be selected via the Sentinel system configuration file.
The compact 1:3 piezo-composite transducer array has 128 separately wired elements, which are used to form 256 equally spaced, receive beams – each with a 1.4° (3.5m) horizontal beam width. Software further interpolates these beams to provide highly accurate bearing estimation for the target.
The sonar head also contains the electronics to digitise, baseband, multiplex and transfer the signals received by the transducer, along with control and monitoring software that performs constant built-in-testing to verify the health of the transducer elements and front-end electronics.
Efficient electronics and transducer arrays result in a total power budget of less than 70 W.
Data is transferred to the surface via either 65 m copper or 300 m or greater fibre-optic cable.
An attitude and heading reference sensor is included in the sonar to compensate for orientation and motion of the sensor. This also allows the sonar to be mounted either way up.
Sentinel sonar heads are available in both a lightweight aluminium housing, suitable for expeditionary use, and in an super duplex housing for permanent installations.
|Feature||Type 8160-000-01 Expeditionary Model||Type 8160-000-02 Long Immersion Model|
|Depth Rating||50 m||50 m|
|Operational Frequency||70 kHz||70 kHz|
|Bandwidth||20 kHz||20 kHz|
|Source Level (dB re 1 µPa @ 1 m)||206 dB||206 dB|
|Pulse Length||40 ms||40 ms|
|Detection Range (Scuba Diver)||Radius 1000 m||Radius 1000 m|
|Target Bearing Accuracy||Down to 0.35°||Down to 0.35°|
|Target Position Accuracy||<1 m at 150 m range||<1 m at 150 m range|
|Voltage||55–0–55 V ac||55–0–55 V ac|
|Power||Maximum 70 W||Maximum 70 W|
|Communication||Cat6 Ethernet||Cat6 Ethernet|
|Mechanical Construction||Aluminium alloy, PVC and PU||Super duplex, PVC and PU|
|Dimensions (Length x Diameter)||432 x 330 mm (17 x 12”)||432 x 330 mm (17 x 12”)|
|Weight in Air/Water||35/6 kg (77/13.5 lb)||45.5/18 kg (100/40 lb)|