The high-resolution multi-beam side scan sonar (MBSS) on the Klein System 5900 improves on the performance of predecessor systems, by employing advanced signal processing techniques and superior acoustic design to improve the overall along track target resolution by more than 25%. The System 5900 uses twice the number of acoustic channels available on the System 5000 series sonar along with an increase in frequency and acoustic aperture length to produce a much higher-resolution, along-track image. The along-track resolution of the System 5900 is 6.2 cm out to 50 m (constant), 9.3 cm out to 75 m (constant), 12.4 cm out to 100 m (constant) and increasing at 0.07 degrees for ranges greater than 100 m. The across-track resolution of the System 5900 is 3.75 cm nominal, at all ranges.
The System 5900 MBSS also uses dynamic beam steering image stabilization techniques to remove artifacts caused by tow vehicle motion which would otherwise blur seabed images; especially at longer ranges where the effects due to angular perturbations are more pronounced. This is a marked improvement over the past systems which produced successive beams perpendicular to the tow body and were more susceptible to compressed or elongated images due to excessive tow fish yaw. Image stabilization helps to effectively extend the range of the sonar by minimizing this distortion. Integrated into the System 5900 sonar architecture is a Swath Bathymetric Sonar (SBS). This sonar uses advanced interferometric signal processing to produce simultaneous estimates of the seabed topography out to the full swath extent of the sonar, typically 10-12 times the overall altitude of the tow fish. The data is co-registered with the resulting side scan backscatter imagery and can be used to more accurately position seabed targets. Side looking sonars that do not have the ability to perform bathymetric measurements must assume a locally flat bottom when measuring the location of seabed targets. This can result in target position errors on the order of meters when surveying over sloped bottoms. The added seabed topographic measurement capability of the Klein 5900 is extremely advantageous when performing missions involving shallow water, rapid assessment.
The System 5900 Sonar System can also come equipped with an optional Gap-Filler Sonar (GFS) used to provide high-resolution acoustic imagery in the vicinity of the side scan sonar "nadir gap". All side scan sonar systems are incapable of adequately imaging the region directly beneath the sonar tow body. This resulting "nadir gap" region, which can be relatively large, depending on the tow body altitude, can either be covered by executing a sonar survey which encompasses 100% overlap on reciprocal adjacent survey lines, or by installation of the GFS. With GFS installed, survey times, with full bottom coverage, can be reduced by approximately 40 percent.
High-Speed Surveys up to 14 Knots with 100% Bottom Coverage
1.8 m Long Array, 600 kHz Side Scan Operating Frequency
Integrated 6 Degrees of Freedom Motion Reference Unit (MRU) for Dynamic Digital Beam Stabilization
FM Chirp Transmit Coding, Extremely Low-noise Acquisition and 28-bit Analog to Digital Converter constitute a very high, Dynamic Range Sonar System
SAS-Ready Composite Array Fabrication Optimized for Multi-path and Surface Reverberation Suppression
Dynamic Focusing, High Pixel Density Imagery provides Enhanced Contrast for Target/Shadow Definition
Swath Bathymetry (455 kHz) for Rapid Environment Assessment Survey with 100% Overlap and Co-registered Coverage to the Side Scan Sonar
Integrated Wing and Dual Actuator Surfaces for Roll Control and Bottom-collision Avoidance
Nadir Gap Filler Sonar (750 kHz) provides full Swath Bottom Coverage which enables Extremely High Coverage Rates
Mine Counter Measures (MCM) Mission Support
Intelligence, Surveillance and Reconnaissance Missions (ISR)