Hello, Researchers have been using FST4 Doppler spread <https://using.tech/posts/fst4/> calculations at sites that experienced the recent annular eclipse to document some pretty interesting ionospheric effects <http://wsprdaemon.org/technical.html>. The question as to whether Doppler spread could be calculated from WSPR data came up and I took a look.
Most of what's needed is already implemented in wsprd.c's subtract_signal2 function: creating a reference signal and multiplying it's conjugate by the received signal. I created a patch <https://github.com/rxt1077/wspr_spread/blob/main/wsprd.patch> that computes the Doppler spread in wsprdl and adds it to the ALL_WSPR.txt output. I wanted to post it here in case anyone would find it useful. Thanks for all of your hard work on this software. 73, Ryan N2BP
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