Originally Posted by JD-EE
The problem with the short ping time is you cannot get the bandwidth down very far or you attenuate signal energy along with noise energy. The signal energy is coherent and the noise energy is not. So increased averaging times decreases your ability to detect the signal once you hit the threshold. Filter ringing, as it is called, screws you if you try really narrow bandwidths.
I was hoping you'd add some reality to this discussion. Agreed on all points. I was only pointing out that there is some room for improvement, given that the frequency spec is +/-1000Hz and the bandwidth of a 10ms pulse is on the order of 100Hz. Thus if you divide the potential 2kHz band into 100-200Hz slices, you stand to improve detection.