GNSS receivers detect, decode, and process signals from the GNSS satellites (e.g., the U.S. GPS, Russia’s GLONASS, EU’s Galileo, China’s Beidou, Japan’s QZSS, India’s IRNSS, etc.). The satellites transmit the ranging codes on two radio-frequency carriers, allowing the locations of GNSS receivers to be determined with varying degrees of accuracy, depending on the receiver and post-processing of the data.

Two GNSS receivers are co-located with VLBI at KPGO, the GPS KOKB receiver and the multi-GNSS receiver KOKV. Both GNSS receivers are used as permanent sites of the International GNSS Service (IGS) network and as a global co-location point linking together the GNSS, VLBI, and DORIS terrestrial reference frames.