What are the challenges of RayTracing for GNSS simulation ?

InsideGNSS

The impact of the environment on the propagation of GNSS signals in constrained environments (such as urban environments) can be assessed by simulations. Indeed, simulations are relevant alternatives to test the performance of GNSS systems and services, compared to measurement campaigns in a live environment. Simulators enable users to control completely the operational parameters and then to test systems or services in different conditions. It also provides users with data to forecast the reception in a given area (for instance, for mission planning) or to analyse what happened (for instance, for mission debriefing).

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