Patent ID: 8588808
Filing Date: 2013-11-19
Classification: G01S,H04W

Abstract:
1. A method of estimating velocity of a mobile station comprising: receiving, by a fixed station, a signal from a mobile terminal; and processing said signal, by a processor operably connected to the fixed station and to a geographical database, using data from the geographical database to determine an estimate of velocity of the mobile terminal, wherein the geographical database comprises descriptive information about a geographical area, wherein said processing comprises: using ray tracing to further identify scatterers by calculating a Doppler spectra from said time-frequency analysis, determining one or more biases from said Doppler estimate, and calculating a best fit of said biases to said Doppler spectra; and determining a Doppler estimation for each said range gate using a weighted least square estimator, where said weighted least square estimator further comprises computing velocity and direction of each said scatterer in each said range gate, estimating amplitude, phase and bias, estimating a standard deviation of errors of said amplitude, phase and bias estimates, and using said standard deviation estimate to calculate said weighted least square estimate.