PROJECT TITLE :

Gaussian process inference approximation for indoor pedestrian localisation

ABSTRACT:

Clutter has a complex effect on radio propagation, and limits the effectiveness of deterministic methods in wireless indoor positioning. In contrast, a Gaussian process (𝒢𝒫) can be used to learn the spatially correlated measurement error directly from training samples, and build a representation from which a position can be inferred. A method of exploiting 𝒢ℬ inference to obtain measurement predictions from within a pose graph optimisation framework is presented. However, 𝒢𝒫 inference has a run-time complexity of 𝒪(N3) in the number of training samples N, which precludes it from being called in each optimiser iteration. The novel contributions of this work are a method for building an approximate 𝒢𝒫 inference map and an 𝒪(1) bi-cubic interpolation strategy for sampling this map during optimisation. Using inertial, magnetic, signal strength and time-of-flight measurements between four anchors and a single mobile sensor, it is shown empirically that the presented approach leads to decimetre precision indoor pedestrian localisation.


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