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Originally Posted by Amizaur
Noticed that too. I guess there is some random factor put in sonar model now. But question is, what should be time base for such change ?
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I haven't played it yet but if it's what it sounds like then your guess is as good as anyone's. :-) It does happen in real life. This is actually a very smart way to model sonar. When one does it, the usual answer is, "gee... that looks about right."
If you want to get REALLY technical, I think they've done something sort of like what's called the "lambda-sigma" process. The idea is that one's signal excess (the brightness of the lines you see on your waterfall display) is composed of the sum of two terms: a deterministic component and a stochastic component. The deterministic component is usually pretty nailed down. It comes from engineering data. The stochastic component is squishy no matter what you do because it depends on oceanographic processes.