Abstract:Currently GNSS observation data for quality evaluation is based on multipath, data integrity, cycle slips and SNR. In this paper, the factor of data efficiency is increased to assess data quality. The method of multi-index comprehensive evaluation firstly proposed is applied to evaluate GPS data quality based on GPS observations from iGMAS, MGEX and IGS. A comprehensive evaluation model is developed based on TOPSIS. Pearson correlation analysis is conducted between the results of the comprehensive evaluation model and various data quality indicators, showing that a strong correlation exists between the results of comprehensive evaluation and data integrity as well as data efficiency. The results of correlation analysis between static PPP results and the comprehensive evaluation show a significant correlation.