I need more info on the Super Dual Auroral Radar Network in Kodiak, AK

The feds plan to put an antenna array in my community "for the purpose of recording signals transmitted by the Super Dual Auroral Radar Network (SuperDARN) in Kodiak, which reflect off the ionospheric disturbance created by the High-Frequency Active Auroral Research Program (HAARP)."

I don't like that word "DUAL" - What is the DUAL purpose of this facility?