Method and apparatus for determining a time delay and a frequency shift between a on a moving subject scattered radio signal and the unscattered radio signal or a scattered radio signal in a known manner in a multi-path signal

摘要

A method (100, 500, 1100, 1200) for determining a time delay and a frequency shift between a on a moving subject scattered radio signal and this is because unscattered radio signal or a scattered radio signal in a known manner in a multi-path signal (x (t)), comprising the steps of:Creating (110, 501, 1101, 1201) of a measurement matrix (x) based on samples of the multipath signal (x (t));Calculating (120, 516, 1108, 1205) a plurality of deviation values for a plurality of different channel vectors (ĥ^(k), ĥ⁽ⁿ⁾) based on a difference of a column (x^(k)) the measurement matrix (x) or of a row (y⁽ⁿ⁾) a transformed measurement matrix (y) and a product of a respective reference signal copy matrix ($X(k)$, $Y(n)$) and the respective channel vector (ĥ^(k), ĥ⁽ⁿ⁾), the respective referenzsignalkopienatrix ($X(k)$, $Y(n)$) on values of the unscattered radio signal, or of the radio signal, or scattered in a manner known per se on values of copies of the unscattered radio signal, or of the scattered radio signal are based in a known manner;Selecting (130, 516, 1108, 1205) of a channel vector (h^(k), h⁽ⁿ⁾), the component to be fulfilled, a selection criterion, calculated deviation value; andMachining (140, 517, 1109, 1205) a matrix of selected channel vectors (h^(k), h⁽ⁿ⁾) based on a parameter - estimation methods, by a time delay and a frequency shift of the scattered radio signal to obtain;wherein the plurality of channel vectors (ĥ^(k)) based on a decomposition (1203) of a more paths reference signal after a plurality of different time delays (τ_r) it is calculated, wherein the more paths reference signal from a sum of weighted copies of the reference signal with different time delays (τ_r) , and frequency shifts (ν_pr) is composed; andthe reference signal is more paths can be represented by ..