User manual SIMRAD MS70 DATASHEET REV A

[. . . ] Simrad MS70 Scientific multibeam sonar system We are proud to introduce the world's first quantitative multibeam sonar for fishery research applications www. SIMRAD. com MAXIMIZING YOUR PERFORMANCE AT SEA System description System overview The Simrad MS70 offers a new dimension to fishery research. It provides an acoustic matrix of stabilized and calibrated beams for biomass estimation, fish school characterization. The transducer array is normally mounted on a drop keel, which allows it to look horizontally. [. . . ] Low sidelobe and interleakage levels Low sidelobes are important for two reasons. The obvious one is to Key points · The Simrad MS70 operates in the 75 to 112 kHz frequency range. · The Simrad MS70 provides an acoustic matrix containing 500 beams (25 horizontal and 20 vertical). · Each beam is 3° to 4° wide depending on its position in the matrix. · -35 dB vertical side lobe levels and beam interleakage. low beam interleakage is obtained by using Frequency Rotated Sector Transmission (FRST) where the frequency band is distributed over all the sectors. Data output It is possible to set up continuous output of all beam data. This can be used for echo integration, school characterization and 3D visualisation. The output data include for example: · non-TVG compensated sample power and sample angle · 20 log R compensated sample Sv · Mean volume backscattering strength for a user defined volume It is also possible to output the element data for post processing and analysis purposes. Calibration A calibration utility is implemented as a special built-in function in the Simrad MS70 system. The sonar can be calibrated using a reference target located under the ship. During the calibration process, the MS70 automatically generate 500 split beams in order to measure the target position within each beam. Individual gain parameters for each beam are adjusted to provide calibrated target strength and volume backscattering strength measurements. Remote operation Remote systems, such as a data logger and external post-processing systems, can subscribe to a series of data and parameters from the MS70. In this way the communication between the MS70 and the remote system can become an efficient, configurable, two-way communication. (CD10104G) avoid that strong targets in side lobes are mistaken for weak targets in the main lobe. [. . . ] It is connected to the ship's network, and can communicate with external postprocessing applications. Transceiver Unit (CD016020B) TRXU Transceivers Power supplies The transceiver circuitry is housed in a 19" rack. It comprises three TRXU transceiver racks, a network controller, and a cluster with six beamforming computers. . Power Cabinets Three separate power cabinets provide the operational power to the TRXU transceiver racks in the Transceiver Unit. Transducer The transducer array is mounted in a circular housing. It is mounted vertically, normally on a retractable keel. Technical specification System · Scientific multibeam sonar Acoustics Frequency range Hardware Transducer · 75 kHz to 112 kHz Beams · · · · Organisation: Matrix Total number of beams: 500 Number of horizontal beams: 25 Number of vertical beams: 20 · Number of elements: 800 · Technology: Ceramic polymer composite · Housing: Circular · Housing diameter: 700 mm Transceiver Unit Beam opening angles · Horizontal: 3° · Vertical: 4° · Opening angles depend on beem steering and frequency. Operating sectors · Horizontal: 60° · Vertical: 45° Motion compensation · Individual Tx channels: 800 · Individual Rx channels: 800 · Beamforming: Cluster of six computers · Communication: 1 Gb Ethernet · Physical dimensions: Height: 1921 mm Depth: 900 mm Width: 600 mm Power cabinets · Roll: ±10° Sidelobe levels and beam interleakage · Vertical: -35 dB · Horizontal: -25 dB Transmission · Quantity: Three cabinets · Physical dimensions: Height: 812 mm Depth: 418 mm Width: 600 mm Operator Station · FM with pulse duration 2 to 10 ms · CW with pulse duration 2 to 10 ms · Source level: > 206 dB Receiving · Type: Commercial workstation · Operating system: Microsoft® Windows XP® Optional systems · Element data logger The transducer array set up for test and calibration at Simrad's test facility · Receiver dynamic range: 150 dB (instantaneous) Calibration · Calibration software included · Target: Tungsten sphere Note that technical specifications can be altered without prior notification! (306694 / Rev. A / November 2006) Simrad Horten AS Strandpromenaden 50 P. O. Box 111 N-3191 Horten, Norway Telephone: +47 33 03 40 00 Telefax: +47 33 04 29 87 www. simrad. com simrad. sales@simrad. com [. . . ]