Patent ID: 8588808

Claim:
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: analyzing said received signal using ray tracing, using a time-frequency analysis to resolve said received signal into components and identifying scatterers and scatterers' contributions to said components, identifying corresponding said scatterers and rays, and calculating Doppler estimates of said corresponding scatterers and rays, and determining a Doppler shift of said received signal and a delay of said Doppler shift, and using matched filtering of said received signal and said delayed Doppler shifted signal, wherein said Doppler shift is determined from a range gate; 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.