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In a typical application the sonar head or transducer is mounted on top of an ROV. The head scans a circle around the ROV and "sees" targets in all directions, including those that are well beyond camera range. The sonar images are displayed on the topside computer. The operator, using the sonar for direction bearings, drives the ROV to the various targets for identification and videotaping.

Scanned data files are stored on the PC’s hard drive along with boat’s GPS position, time, date, and other pertinent data. The recorded files can be played back at anytime. Software is provided to allow post-processing of data including editing and merging of files. Small file sections, including screen shots, can be edited out and copied to a small file for emailing. A sizing tool is included in the software which allows the operator to determine the size of the targets on the screen.

The system package includes the sonar head with "downstairs" electronics, cable, surface sonar processor, software, and A/D board for your computer. The A/D board significantly improves data transfer time to the computer which increases the sweep speed (takes less time to complete each sweep).

Scanning sonars operate very similar to radar, a signal is sent out from its antenna and then it listens for return signals. The signal is fan shaped and very narrow in width. The return echoes are displayed on the computer screen as a very narrow line that changes color along its length depending on the intensity of the echoes.

After the line is displayed, the antenna (called a transducer in sonar) rotates (steps) slightly to the right and the sequence is repeated. The smaller the step (1/2, 1, 1 1/2, or 2 degree) the higher the resolution of the picture. The transducer continuously steps, and the display quickly fills with the sonar image. The sequence is repeated, and if nothing moves (targets or sonar), then the identical picture will be overlaid over the previous picture (one line at a time).

JW Fishers scanning sonars have a full set of operator controls and indicators which are conveniently located on the front of the sonar processor and on the PC screen. The controls are:

• Speed Control. Allows the operator to optimize the speed of the scanning sonar to match the speed of the computer; the result is faster sweeps.
• Record and Playback. A complete set of controls for both recording and playback of files.
• Range Setting. Selection from 5 to 80 meters in five steps allowing both short range scanning for the smallest of targets to long range for locating larger targets. The range settings are 5, 10, 20, 40, and 80 meters.
• Step Degree. From 1/2 deg to 2 deg in four steps: 1/2, 1, 1 1/2 and 2 degrees. The smaller the step the higher the resolution and detail of the picture. The larger the step the more coarse the picture, but the faster the sweep.
• From and To Sweep angles. The system can perform continuous 360 degree sweeps or "back and fourth" sweeps between any two selected degree angles.
• Zoom. Zooms in or expands/enlarges picture
• Print Delay. Delays start of image on screen which moves targets that are at the outer edge towards the center of the screen.
• Size. Displays size of selected target.
• Amplifier adjustments. Allow the operator to fine-tune the received signal for the sharpest displayed picture.
• Gain. Increases overall gain of picture.
• Colors. Different color scales are selectable.
• Color Bar. Displays the range of colors selected. A small return signal displays the color on the left end of the bar, a large return displays the color on the right end of the bar. A total of 256 colors can be displayed.
• Invert Color. Inverts the color bar to give a different look to the target being examined.

• Sonar Processor 8"W x 9"D x 2.5" H, air/water x lbs
• 650A Sonar head and housing 3.5" Dia x xx" L, air/water x/x lbs
• 650B Sonar head 3.5" Dia x 4"L, air/water x lbs, Housing 3.5" Dia x 9" L, air/water x lbs

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