Feature-Based Passive Animation Go to Home of Dolphin Inspired Sonar.

Simulations of
by Douglas Moreman

Click to enlarge

1) Active. sonar 2005

2) Dual. April 2013 A.

4) Passive. May 2013

3) Dual. April 2013 B.

This is not make-believe. If the data-files of simulated echoes were replaced with data-files from real echoes of clicks of dolphins, images would be computed.

Simulated click of a dolphin.

The duration of the "fang" part of the click is 1/100,000 second as in dolphins - which suggests a frequency of 100,000 cycles per second, if the click were a sine wave.

This is, so far as I know, the nearest simulation in the world to what dolphins are actually doing with their sonar (Correct me, if I am wrong: doug@DolphinInspiredSonar.com ).

The grid-spacing in the picture is 6 inches.

The target is a white, skeletal fish. The colored dots are what the FBP software computes from the simulated echoes.
A side view of the actual, simulated, skeletal, fish is in the lower third of the view.

A bag of tricks, not yet used here, exists for improving the picture from the given data. The occassional glitchy phantom dots can be removed by later versions of the program.

Please remember that some limiting characteristics of the images have to do with keeping low the time the experimenter waits between his tests.