Solstice – Multi Aperture Side Scan Sonar

Mission ready; designed to support search, classify and map (SCM) and hydrographic operations
Small and compact arrays; optimised for low-logistic AUVs and towed bodies
Survey more ground in a single pass; 200 m-wide swath ensures high coverage rates
Along track resolution of 0.15°; best in class delivering maximum detection rates
Collocated side scan image and bathy improves your situational awareness
Consumes only 18 W; power budget friendly increases your AUV’s endurance

Capture every feature, every detail in high resolution

Solstice significantly increases the operational envelope of your underwater vehicle by providing wide swath coverage, at high resolution – all while consuming very low power. The imagery produced by Solstice is recognised to be of the highest quality possible from side scan sonar enabling detection and classification of seafloor objects across the whole swath.

Solstice is the number one side scan sonar in the world for AUVs and towed bodies. Its multiple apertures improve the signal-to-noise ratio performance, capturing stunning imagery at longer ranges than other sonars at the same frequency. It is interferometric too, meaning you also get co-located 3D data. It’s the ideal choice for hydrographic, archaeological, search, salvage, unexploded ordnance, and mine countermeasure missions.

Each of Solstice’s 300 m-rated, 682 mm long, 2.11 kg arrays, has 32 multibeam elements. This configuration ensures that your AUV or towed body is able to gather more data with higher image fidelity.

Unlike most conventional side scan sonars which have a fixed focus, Solstice uses a unique back-projection beam-forming technique to focus at every single pixel in the image. Imagery from conventional side scans is also often distorted due to non-linear platform motion and may have gaps in coverage due to platform roll, pitch and yaw.

Solstice on the other hand uses knowledge of the platform motion to eliminate its effects, producing undistorted imagery with 100% ground coverage.

Accurate imaging demands highly linear element alignment, which cannot easily be achieved mechanically.

Real-time array calibration is therefore used to dynamically re-calibrate each individual hydrophone element several times a second to compensate for any dynamical strains causing array non-linearity.

Solstice has been designed to produce high-contrast imagery, even in shallow, littoral waters, eliminating noise from multi-path reverberation, enhancing the contrast of the imagery. It employs a unique array technology which allows wide swath coverage normally associated with wide vertical beamwidth, whilst providing the shadow contrast associated with very narrow vertical beams.

The result is improved probability of detection and decreased probability of false alarms improving the efficiency of your mine counter-measures, archaeological, search and salvage missions.

Technical Features

Why Solstice

Technical

  • Frequency band 725 kHz to 775 kHz
  • Source Level (dB re 1 uPa @ 1 m) 220 dB
  • 2 x (32 + 4) Receive channels
  • 2 x 32 Transmit Channels

Design

  • 2 x array flanks each 682 mm in length, weighing 2.11 kg
  • Processing electronics in their own payload pressure vessel (PPV) or as OEM
  • Simple to install and mount
  • Uses widely available Subcon connectors

Performance

  • Depth rated to 300 m
  • Across track resolution 37.5 mm
  • Along-track resolution 0.15°
  • Geo-rectified waterfall display
  • Image resolution 30 mm x 30 mm
  • Co-located side-scan and bathy
  • Real-time CAD/CAC option

Ownership

  • What’s in the box: 2 x Solstice arrays, PPV Module (or OEM electronics)
  • Warranty: 1 year return to Sonardyne service centre
  • No Licence Required

More about this product

Solstice System Specifications & DataSheet

 

Feature Type 8200
Depth Rating 300 metres
Frequency Band 725 to 775 kHz
Source Level (SL = dB re 1 uPa @ 1 m) 220 dB
Number of Receiver Channels 2 x (32 + 4)
Number of Transmitter Channels 2 x 32
Azimuth Beam-Width 0.15°
Swath 200 m
Bathymetry Yes
Power (Array & PPV) 18 W
Operating Temperature -2 to 40°C
Hydrophone Array Length 682 mm
Projector Array Length 416 mm
Output Formats .SWF8 and .XTF
Weight in Air/Water 2.11/0.76 kg
   
Optional PPV*  
Depth Rating 300 metres
Dimensions (Diameter x Length) 133 x 289 mm
Weight in Air/Water 2.88/0.25 kg

*OEM electronics board also available

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