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I was thinking some more about a good test target...
Many small sailboats have those aluminum radar targets so they don't get run over by other boats. Perhaps a similar thing could be made for the sonar.
In the radar version, 3 orthogonal metal plates reflect the sonar energy back to the source, regardless of it's direction.
In fact, a regular radar target could be held underwater at a known depth, or to make it show up better, the height could be extended, and several horizontal plates used.
Again, for those that didn't read my other message on this, the point of using a target like this would be to drag the fish past it, and see when the target showed up and how long it stayed. This would allow us to infer the horizontal beam shape, tell us if there were any side lobes and allow us to test the range.
-Bob
Many small sailboats have those aluminum radar targets so they don't get run over by other boats. Perhaps a similar thing could be made for the sonar.
In the radar version, 3 orthogonal metal plates reflect the sonar energy back to the source, regardless of it's direction.
In fact, a regular radar target could be held underwater at a known depth, or to make it show up better, the height could be extended, and several horizontal plates used.
Again, for those that didn't read my other message on this, the point of using a target like this would be to drag the fish past it, and see when the target showed up and how long it stayed. This would allow us to infer the horizontal beam shape, tell us if there were any side lobes and allow us to test the range.
-Bob