Assessment of Real-Time GPS/BDS-2/BDS-3 Single-Frequency PPP and INS Tight Integration Using Different RTS Products

Due to the virtues of low-cost and high positioning accuracy, Single-Frequency Precise Point Positioning (SF-PPP) is becoming a prospective technique. However, SF-PPP not as widely used dual-frequency triple-frequency PPP at present, owing effect ionospheric delay residuals after model rectification. In recent years, with evolution multi-constellation Global Navigation Satellite Systems (multi-GNSS, i.e., GPS, BDS-2, BDS-3), it has become possible obtain credible continuous results using SF-PPP. such performance would be significantly degraded in challenging environments (i.e., boulevards, tunnels, tall buildings). Under these circumstances, GNSS signals are obstructed, difficult provide sufficient observations for Therefore, Inertial System (INS) employed promote The PPP/INS integration regarded one most efficient approaches GNSS-denied environments. To satisfy request supplying real-time information, Real-Time Services (RTS) International Service (IGS) precise orbit clock products globally distributed users through internet. this paper, GPS/BDS-2/BDS-3 INS tight proposed, assessed data gathered by vehicle afforded CAS (Chinese Academy Sciences), GFZ (Deutsche GeoForschungsZentrum), WHU (Wuhan University). outcomes illustrate following: (1) GPS + BDS SF-PPP/INS can more accurate solutions compared those SF-PPP, improvements 52.8%, 31.1%, 42.8% north, east, vertical components, respectively. (2) general, products’ accuracies terms three analysis centers consistent each other. For BDS, product from GFZ. accuracy lower provided other two centers, especially BDS-2 satellites. (3) Root Mean Square (RMS) values based on much higher than directions.