HISAS 1030
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High resolution interferometric synthetic aperture sonar

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Search for objects Rapid Environmental Assessment (REA) High area coverage rate High resolution Wreckage of Heinkel He 115 sea plane. Courtesy of the Royal Norwegian Navy HISAS 1030 imagery of cluttered seafloor with a 2 m long, 53 cm diameter cylindrically shaped exercise mine. Dummy mine Range 45m AUV depth 3 m Range 15-95 m Water depth 10-13 m 10x10 m detail around the exercise object

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HISAS 1030 • HISAS 1030 is an interferometric synthetic aperture sonar system capable of providing very high resolution images and detailed bathymetry of the seabed. • Originally developed for demanding military mine countermeasures (MCM) operations, where there is a need to detect and classify small objects on the seafloor in a challenging clutter filled environment. The sonar is installed onboard HUGIN 1000, a medium size AUV in Kongsberg’s family of AUVs. • Range-independent resolution of approximately 3x3 cm out to a distance of more than 200 m from both sides of the AUV at a speed of 2...

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Main features • A transmitter array and two multi element receiver arrays fitted to both sides of the vehicle enable co-registration of images with slightly different geometry of the same scene. This allows for very high resolution bathymetry and at the same time adds to the systems robustness. • The transmitter beam direction and coverage is controllable in the vertical plane, and this feature is used to minimize the influence of surface and seabed reverberation. This is particularly important when operating close to the surface and in shallow water, where the achievable range can be...

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Shadow enhanced SAS • Shadow classification is an important tool when examining small objects such as mines. • Processing for maximum shadow contrast makes use of the same data set as that used for processing SAS images. Increasing the “shadow resolution” gives the operator an extra valuable dimension to examine in the data set. • With HISAS, shadow processing is available as a fast, low-cost post-processing step after standard SAS imaging. • The figure below shows an example of a normal SAS image of a moored transponder together with the shadow enhanced image. Since the object is moored,...

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• A complete SAS post processing toolbox named "FOCUS" is delivered with HISAS 1030. The FOCUS toolbox system provides multiple layers of processing, each with separate sets of products. • Rapid result - dynamically focused side scan images, side scan bathymetry. - Dynamically focused side scan imagery from HISAS 1030 typically has an along-track resolution of 40-100 cm and can be generated in real time during the AUV mission, for use in quality control and rapid availability after AUV recovery. - Side-scan bathymetry is currently generated as a rapid product in post processing. •...

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Example of SAS images from pipeline survey operation. 2 nmi x 500 m covered in one hour, with heavy overlap and one pass at each side of the pipeline • Classification – full resolution imagery, SAS bathymetry and other advanced products. - Highest resolution, highest quality end products from the sonar. They require extra processing time and take up a lot of disk space and are therefore usually only generated for areas centred around objects of special interest. Spot processing may generate a movie clip, a 3D representation of the object and even higher resolution images than normally...

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• A typical configuration consists of two powerful computers each with two quad core CPUs running FOCUS software, and connected to a post mission analysis (PMA) computer with four screens. • During the AUV mission, HISAS data is stored in a removable hard disk container. The hard disk container is removed after completion of the AUV mission and is placed in a docking station connected to the two computers running FOCUS SW. • Solutions are available for integrating FOCUS with third party post-mission analysis and display software such as “Triton AUV Suite” from Triton Imaging®. The Nexus...

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Post Mission Analysis (PMA) system FOCUS Synthetic Aperture Sonar Signal Processing Toolbox. Nexus interface to FOCUS and Triton. Triton AUV Suite or other third party display and analysis software. Desktop PMA Workstation computer. Two HISAS FOCUS Workstation computers. Four 20” displays. HDD Container Docking Station. Operational performance Maximum range (each side of vehicle): 200 m @ 2 m/s and 260 m @ 1.5 m/s AUV speed. Maximum instantaneous area coverage rate (operation geometry dependent): 730 m2/s. Theoretical resolution (across-track x along track): 2 x 2 cm. Practical resolution:...

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We are always there, wherever you need us Global and local support Kongsberg customer services organisation is designed to provide high-quality, global support, whenever and wherever it is needed. We are committed to providing easy access to support and service, and to responding promptly to your needs. Support and service activities are supervised from our headquarters in Norway, with service and support centres at strategic locations around the globe – where you are and the action is. As part of our commitment to total customer satisfaction, we offer a wide variety of services to meet...

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