1. Processor circuitry programmed with logic to implement functions, comprising: receiving time-of-flight information (ToF) for communications between one or more Access Points (APs) and a mobile device; identifying a first group of state variables having a Gaussian noise distribution and applying a Kalman filter (KF) to determine probability of error in a ToF location determination as a function of the first group of state variables; identifying a second group of state variables having a non-Gaussian noise distribution and applying a Bayesian filter (BF) to determine probability of error in the ToF location determination as function of the second group of state variables; approximating the location of the mobile device at least partly by combining the probabilities of error determined using the KF and the BF.