Time Difference of Arrival Enhancement with Ray Tracing Simulation

In an urban environment, the performance of TDoA sensors is affected by multipath wave components, where different rays are sum up at each sensor increasing the error position. There are some statistical methods to mitigate Non-Line-of-Sight (NLoS) effects, they use signal processing tools to improve the accuracy, but such techniques could not work when almost all the sensors only get the NLoS ray components. The Ray Tracing (RT) simulation tools can give an estimation of the description of multipath propagation that affects localization algorithms. The technique proposed uses time reversibility of the Channel Impulse Response and a Ray Tracing propagation tool to build a geographic time difference fingerprint that is used to enhance the performance. The main idea behind such approach is to add the scenario information and features in the signal processing, what can be applied in real localization problems where a TDoA system is deployed in hash Multipath. A measurement campaign was done to validate the technique and showed an enhancement in the localization precision.