Tuesday, August 28, 2012 Juha Vierinen's project GCS, GNU Chirp
Sound "The GNU Chirp Sounder is a software defined radio based
receiver for monitoring ionospheric sounders (ionosondes) and
over-the-horizon radars that use linear frequency sweep FM-CW
transmissions. The software is based on gnuradio and relies on
Ettus research USRP2 and USRP N210 based digital receivers. The
receiver can be used to receive the whole HF band (typically at
25 MHz bandwidth) simultaneously, and to receive multiple
sounders simultaneously. The current receiver can be used to
perform single or dual polarization (channel) soundings. The
dual channel recorded can be used to determine the polarization
form vertical soundings, or for angle of arrival measurements.
Multiple independent receivers could also be used for imaging
purposes."