3D Ray Tracing Based BDS Multipath Characterization in Urban Canyons
Shaoqian Li, Rong Yang, Xingqun Zhan, School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai
Multipath (MP) is the most detrimental error source of GNSS positioning in urban canyons, introduced by reflection, diffraction, and scattering effects. Multipath characterization is the prerequisite of its mitigation or compensation. Especially, for Beidou navigation satellite system (BDS) with hybrid constellation deployment, the multipath may behave quite differently as compared to other GNSS. Hence, this work will conduct BDS multipath simulations with a 3D ray-tracing method in Lujiazui area. The BDS features from GEO, MEO, and IGSO satellites will be investigated in terms of code delay, carrier phase, and Doppler shift. The simulation results show Gamma distributions for all orbits in terms of reflection delay, which are inversely proportional to elevation angles. In addition, the positioning results are skewed to densely constructed geometry due to the non-line-of-sight (NLOS) signals.
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