GNU Digital Beacon Receiver (GDBR)
GDBR = GNU Radio & USRP based free receiver for ionospheric TEC measurement

``GNU Digital Beacon Receiver (GDBR)" is a simple digital receiver developed for the satellite-ground beacon experiment to measure ionospheric total electron content (TEC). The free software toolkit for the software defined radio, GNU Radio, was utilized to define basic function of the receiver, and perform fast signal processing. The software was written in Python for a LINUX PC. The free hardware called Universal Software Radio Pheripheral (USRP), which best matches the GNU Radio, was used as a frontend to acquire the satellite beacon signals of 150 and 400 MHz. This homepage is dedicated to distribute detailed information of the GDBR, and enhance research activities of and related to the GDBR.