This is for ionosphere research, leverages doppler shifting of the broadcast signal. http://elpub.wdcb.ru/journals/rjes/v10/2007ES000227/2.shtml http://elpub.w

This is for ionosphere research, leverages doppler shifting of the broadcast signal. http://elpub.wdcb.ru/journals/rjes/v10/2007ES000227/2.shtml http://elpub.wdcb.ru/journals/rjes/v10/2007ES000227/2.shtml Scroll down to "Doppler Radio Sounding of the Ionosphere", note the broadcast frequency.