Performance Investigation of Multi-Constellation Global Network Satellite System (GNSS) using Precise Point Positioning over Bangladesh

Though recent study shows various algorithms that help finding the best Multi-GNSS Experiment (MGEX) data, similar work in the context of Bangladesh has still not been explored. In this study, the aim is to find out the station that provides the best MGEX data for performance analysis of GNSS signals over Bangladesh. During the research, ionospheric-free (IF) dual-frequency data were used to evaluate the performance of multi-constellation GNSS. For obtaining higher accuracy in multi-GNSS Precise Point Positioning, the IF model and Saastamoinen model are used. These models mitigate the GNSS signals ionospheric delays and tropospheric delays. The performance analysis was conducted using the MGEX data from five different IGS station around the world. The number of tracked satellites were highest for the data of India as it is the closest station near Bangladesh. The value of Position Dilution of Precision (PDOP) and Geometrical Dilution of Precision (GDOP) values were found the lowest for the data of India among the other countries considered for different combination of constellation. For triple constellation satellite system, the highest number of tracked satellites was twenty-one and the lowest value of PDOP and GDOP were 1.233448 and 1.394483 respectively hence greater accuracy in point positioning has been achieved.