Patent ID: 9268025
Filing Date: 2016-02-23
CPC Classification: G01S,H04B,H04N

Claim Text:
1. Method for determining a relative offset estimate between a first signal and a second signal comprising: acquiring at least one of the first signal and the second signal, including receiving and demodulating a radio positioning system signal to yield the second signal at a receiver; for each of the first signal and the second signal, determining a subset of transform coefficients of said signal, including determining an aliased signal from said signal, and performing a forward transform of the aliased signal to yield the subset of transform coefficients; combining the subsets of the transform coefficients to determine a subset of transform coefficients of a correlation signal; performing an inverse transform of the subset of the transform coefficients of the correlation signal yielding a modified correlation signal; determining a set of two or more relative offsets consistent with the modified correlation signal; determining the relative offset estimate, including performing a correlation computation using the first and the second signals at multiple relative offsets of the set of two of more relative offsets; and using a data signal representing the relative offset estimate in radio positioning of the receiver.