[amsat-bb] Doppler measurment of TCA

[Jim White]

Wednesday's launch of a large batch of satellites seems an opportunity 
to try the Doppler shift method of matching a satellite to a set of keps.

In reading a few blogs and posts it seems the method is to use an SDR 
and GNURadio tools to determine the time of TCA for a downlink signal. 
Then use a tracking program to provide the TCA time for several sets of 
keps. And finally to match the observed/calculated TCA with one set of 
keps.  Can anyone provide a pointer to a GNURadio flow diagram that 
includes a tool to calculate TCA time from the signal received during a 
pass?  I'm pretty new to GNURadio so finding such resources is still a 
bit of a mystery for me.

Jim