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Consider this:
Most PIMD have a front end preamp that feeds an integrator or 3 then on to an audio circuit with a pitch change that indicates the presence of a target.
What if the decay waveform was fed straight to a multi-channel equalizer (gyrator type) and the output of that straight to the audio amplifier.
The human ear can discern the most subtle of waveform changes. The equaliser could be set to boost areas of the decay curve that contained changes of interest (ie early part) for detection of small fast targets. After a short period of use I am sure that the ear/brain combination would be able to learn what certain materials/size/distance sound like.
Most PIMD have a front end preamp that feeds an integrator or 3 then on to an audio circuit with a pitch change that indicates the presence of a target.
What if the decay waveform was fed straight to a multi-channel equalizer (gyrator type) and the output of that straight to the audio amplifier.
The human ear can discern the most subtle of waveform changes. The equaliser could be set to boost areas of the decay curve that contained changes of interest (ie early part) for detection of small fast targets. After a short period of use I am sure that the ear/brain combination would be able to learn what certain materials/size/distance sound like.