OKTAL-SE publications

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Satellites Navigation (GNSS)

Evaluation of a GNSS receiver performance in different multipath environments with a novel real-time multipath simulation system

Download PDF ION2017
Multipath can be one of the main sources of error in a GNSS receiver in urban environment. Multipath errors can vary from a few meters to hundreds of meters according to the geometry of the satellites and environmental conditions, in particular buildings. The characterization and study of multipath is complex but important when its effects need to be compensated in a GNSS receiver, e.g. for positioning purposes. The disruption of the antenna surrounding environment in the GNSS received signal can be assessed in simulation. In fact, simulations are a powerful tool to test the performances of GNSS systems and services in controlled and repeatable conditions. Furthermore, simulations provide users with a method to characterize the multipath, to study and test advanced and new techniques for multipath rejection, to evaluate the reception in a given location and at a specific time (i.e. mission planning), and to simplify the analysis of specific events (i.e. for mission debriefing).

What are the challenges of RayTracing for GNSS simulation ?

Download PDF 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).

Design of GNSS Performance Analysis and Simulation Tools as a Web Portal

Download PDF TELFOR2013
This paper considers design of a web-portal for the validation of behavior of GNSS applications in different environments. The tool provides the positioning performance analysis and a comparison to benchmark devices. Web-portal incorporates a 3D synthetic data generator to compute the propagation and the reception of radio-navigation signals in a 3D virtual environment. This radio propagation simulator uses ray-tracing to calculate interactions between the GNSS signal and the local environment. For faster execution on a GPU platform, the simulator uses BVH optimization. The work is verified in field trials and by using reference software.

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