Nowadays advanced weapon systems have been developed based on high precision position information, and GNSS technology is used variously in the systems. To improve the accuracy and integrity performance wide area augmentation systems like SBAS have been developed. In this paper, we will describe the results of augmentation information direct loading system without real-time data-link like Geo satellite, and analyze the correction information accuracy and timing performance in the system. Correction information of GNSS wide area augmentation system is evaluated as having effective time of more than hundreds seconds. Especially a correction algorithm is proposed to utilize all tracking GNSS satellites signals in the view point of ionosphere delay model. These results are verified and shown by the post-processing program with real GPS measurement data.

Keywords: GNSS, wide area augmentation system, accuracy