Design of GPS/SBAS software receiver

Correction data of SBAS are classified to three categories such as the fast correction, the long term correction and the ionospheric correction. To retrieve and process the correction data, this paper modifies the software GPS receiver designed by CSLAB. The designed receiver can process all kinds of SBAS signals: WAAS, EGNOS, MSAS and GAGAN by just changing software. The performance of the implemented GPS/SBAS receiver is evaluated using real WAAS satellite signal and MSAS satellites signals which are available in Korea.