Abstract:Based on analysis of GPS observation data decoding and data quality indices, we compile a new program for decoding the original observation data and calculating and analyzing the quality indices, such as multipath effect, cycle slips and so on. The quality indices can be displayed intuitively by graphics in real-time. Moreover, the experimental verification is carried out through engineering practice, and the results prove the correctness and reliability of the designed software, providing guidance and help for practical work.