GNSS positioning performance analysis of Android smartphones

With the development of Global Navigation Satellite System (GNSS) and the progress of mobile communication technology, users put forward higher requirements for location services. In this paper, GNSS data are collected by using two Android smart phones that are common in the market, and the algorithms of standard point positioning (SPP) and single frequency precise point positioning (PPP) of Android smartphone are studied. The positioning performance of SPP and PPP of smart phones under different conditions is analyzed. The results show that based on the random model of Doppler smoothing pseudo range and signal-to-noise ratio, The SPP positioning accuracy of Android smart phone GPS single system can reach within 3 m, and the positioning accuracy of GPS、Galileo、GLONASS、BDS four system can reach sub meter level. In single frequency PPP static positioning, under the single GPS system, the positioning accuracy can only reach meter level, and the convergence time is long; Under GPS、Galileo、GLONASS、BDS four system, the positioning accuracy can reach sub meter level, and the plane direction can converge within 40 min. In single frequency PPP dynamic positioning, the positioning accuracy of mobile single frequency PPP can only reach meter level.