In a not-so-similar situation, I was able to use a Lomb-style periodogra
to "regularize" my data, creating an approximated evenly-sampled tim
series from an interpolated frequency series.

Then I could use all of the standard tools in my toolbox.

But:

(1) This is an expensive way to do data, not for the real-time (dsp?
faint-of-heart. (Are you processing offline?)

(2) You are discussing an extraordinarily ambitious sampled-time domain..
microseconds to minutes... megahertz to millihertz... Wow! Not sur
you'll be able to find the needles in your haystacks.

If you come upon something that works, I'd love to know, and am guessin
others would as well.

Bon chance,

- F.