Wide Area Differential GNSS (WADGNSS) is an augmentation system for GNSS which can improve the accuracy and integrity of GNSS. In South Korea, we are under development of our own WADGNSS. For last 4 years, the core algorithm of Korean WADGNSS is developed and now it is under verification process using pseudolite based WADGNSS demonstration system. In this paper, the developed pseudolite based WADGNSS demonstration system is described, and the performance of the developed WADGNSS algorithm is verified using the experimental result under the demonstration system. The developed demonstration system is composed of master station server, pseudolite, and user receiver. The master station server collects the GNSS measurements from several reference stations, and generates correction messages in real time. The pseudolite accesses to the server using TCP/IP network to get the correction messages, and broadcast them on L1 frequency. The user receiver calculates its DGPS position using live GPS signals and pseudolite signal which contains correction messages. In particular, in this experiment, a commercial U-blox receiver is used as the user receiver. Also, a verification using commercial car navigation is performed under the demonstration system.

Keywords: GNSS, WADGNSS, pseudolite, PBAS