That would done right be the most accurate, only the first few cycles are not affected too much by propagation.
After swotting how loran combats propagation effects I realized this could be done with Msf, our version of Wwvb, allthough I suspect ours is different, Msf commutates the carrier, whereas Wwvb I believe is either phase modulated or carrier amplitude keyed, dont spose that matters for your app.
So a 1 second pulse could be derived from Msf more accurately than just syncing an oscillator to the 60kc carrier like I'm doing with my previous project.
I used my Gps frequency source and my usb 'scope to get an image of the loran signal from my crude loopstick front end on the bench, you can see there is some visible envelope distortion, the tone burst is sposed to have a nice raindrop profile like it does in the memory buffer display at the top, but in real life zoomed in you can see its all messed up.
Even with the loopstick in a 'quiet' area its still messed up, loran receivers at least later more accurate ones must use multiple samples and digital filtering to get around this phase distortion.
I had issues with feedback derived oscillations, so I need to build the preamp into a screen, I have some old tube radio If tranny screens, they'll do.
The issue here is as you can see the loopstick rings at 100kc, I would have liked to detect the loran signal by timing zero crosses, the first 2 5uS crosses denoting the first invomming wave, but with the loopstick ringing at its tuned freq I cant do this as theres always some 100kc signal, so maybe a whip antenna would be better or an untuned loop like the trask.