Reson Seabat 8101

Installationing. Allow sufficient bend radius for the cable (see paragraph 2.4.5.2) and ensurethat there is no strain at the connector when the structure is in either the stowedor operating position. If cable clamps are used, protect the cable jacket fromsharp edges on the clamps. Position the head so that the projector and hydrophonehave an unobstructed line of sight to forward and a minimum of 75 degreesto either side (105 degrees for a 210 degree head).The location of the head should be chosen to be as far away from other sourcesof acoustical energy and mechanical hull-borne noise as possible. High ambientnoise will degrade 8101 system performance. In addition, the location should allowrelatively easy access to the head for preventative maintenance and inspection.In the case of an ROV installation, place the head in a location to ensurethat it does not "see" any part of the ROV structure. A typical location is slightlyforward and above the bottom plane of the ROV.2.4.2 Installing the Sonar HeadThe sonar head may be permanently mounted, as part of the vessel's structureor mounted on a temporary structure such as a pivoting or retractable pole. Thehead requires accurate placement and precise alignment in azimuth and elevation.In addition, the head must be securely mounted to ensure that both locationand alignment cannot shift during a survey. Careful consideration must be givento the routing of the sonar head to sonar processor cable to avoid cutting orabrading the outer waterproof jacket. If the installation is part of an ROV/UUV,locate the sonar head as far from hydraulic pumps or other rotating machinery asis possible in the confined space of the vehicle. In addition, place the head as farforward as possible and at least a meter above the bottom plane of the vehicle.2.4.3 Orientation of the Sonar HeadThe sonar head should be mounted with the array center scribe mark orientedstraight down with the projector pointing aft (see Chapter 9, Drawing 10723).Care should be taken to ensure that the head is parallel, as closely as possible,to the horizontal plane of the vessel or ROV. Small errors in mounting can becompensated for by post-processing data acquisition software.2.4.4 Sonar Head Acoustic CenterFigure 8 provides the acoustic center location (the intersection of lines Y-Z andX-Z) required for Vessel Reference Point (VRP) measurement. This is the pointto which the offset measurements (in relation to the VRP) are made for the multibeamsystem. Figure 8 illustrates a sonar head with a stick projector installed.For sonar heads equipped with an Extended Range (ER) projector, the acousticcenter will be the same as shown in Figure 8 (the slight offset is compensated forin the system’s software). See also paragraph 3.10.5.______________________________________________________________________SeaBat 8101 Operator's Manual 2-4 Version 3.02