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Key Features
Increases the operational envelope of existing sensor platform systems by 200%
Diffraction limited 5-20cm resolution across the full swath
Less than 12W power consumption for both sides; a considerable saving over current systems
Enables onboard computer-aided detection and classification
Co-registered side scan imagery with full swath bathymetry (COBI)
Unique algorithms guarantee minimal waterfall distortion at long ranges
Extreme multi-beam performance at 65 beams per frame
Multipath Suppression Array Technology (MSAT)
Real Time Auto-Calibration (RTAC)
Solstice Side Scan
Solstice Side Scan
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Solstice is a new generation of search and classify side scan sonar with integrated swath bathymetry.

The sonar has been designed specifically for operation on small, medium and large AUVs. It increases the operational envelope of a vehicle significantly by providing wide swath coverage at high resolution whilst consuming less than12 Watts of power. This results in high area coverage rates and long vehicle endurance.

Solstice’s onboard processing produces geo-coded side-scan imagery and co-registered bathymetry which is available for onboard automatic target recognition and post-mission analysis.

The imagery produced by Solstice is designed to be of the highest quality possible from a conventional (non-SAS) sonar. To achieve this, the system uses several innovative techniques.

The image is fully focussed with 65 beams formed on each side. A ‘back-projection’ beam-forming technique focuses the beams on every point over a 1” x 1”grid of pixels over the entire swath.

Micro-mosaicing algorithms (P²I) stitch ‘tiles’ together minimising distortion at long ranges. Objects are displayed in high resolution, high contrast and minimum geometric distortion.

The system auto-calibrates itself each ping cycle in order to compensate for any deformation in the array due to vehicle flexing, temperature and depth effects.

The effects of multi-path are reduced by the design of the array.

Click here to read the Solstice article published in IOS magazine, March 2010

FeatureType 8200
Hydrophone Array Length 672 mm
Number of Receiver Channels 32
Number of Transmitter Channels 32
Azimuthal Bandwidth 0.15°
Projector Array Length 416 mm
Centre Frequency 735, 750 or 765 kHz
Frequency Band 725 to 775 kHz
Elevation Beam-Width 80°
Source Level 220 dBµPa @ 1 m
Pulse Length 1 ms FM
Swath 200 m
Bathymetry Hydrophone Array Height 19 wavelengths
Number of Bathymetry Verniers 6
Operational Depth Rating 200 metres

This high resolution imagery was collected at Plymouth Break Water by Sonardyne's Solstice sidescan sonar. The imagery was obtained in only 7 meters of water depth and the swath is 200 meters wide.

On the right hand side boulders from the break water are clearly visible and throughout the imagery the contrast in the sea floor from sand ripples to rocky out crops is clearly seen.

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