User manual SIMRAD MS70 DATASHEET REV A

[. . . ] The Simrad MS70 allows characterization and volume estimation of a school of fish using only one single transmission. Schools of fish can be tracked, followed, and studied using mulitple consequitive transmissions. As a consequence of the horizontal transmission using narrow beams, the MS70 allows you to detect and characterize schools of fish even very close to the sea surface. [. . . ] · 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. · 60° horizontal operating sector. · 45° vertical operating sector. · -25 dB horizontal side lobe levels. · -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. [. . . ] (Data kindly provided by IMR, Norway. ) System diagram Beamforming computers Operator station Network controller Operator station The Simrad MS70 Operator Station comprises a workstation running Windows XP® operating system. 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. [. . . ]