Patent ID: 9383430
Filing Date: 2016-07-05
CPC Classification: G01S,H04L,H04W

Claim Text:
1. A method for determining a location of a receiver using a multi-carrier signal, the method comprising: receiving a plurality of OFDM-like multitone signals, each OFDM-like multitone signal having subcarriers and modulated with a pseudo-random noise code and transmitted from a transmitter with a known location; determining a coarse estimate of a time of arrival of at least one subcarrier of the OFDM-like multitone signals by adjusting the coarse estimate of the time of arrival in accordance with a code correlation function; determining a precise estimate of the time of arrival of at least one subcarrier of the OFDM-like multitone signals by adjusting the precise time of arrival to align a slope of at least two of the subcarrier phases of the OFDM-like multitone signals in accordance with a phase correlation function and consistent with the coarse estimate of the time of arrival associated with the code correlation function; and estimating the location of the receiver or estimated range between the receiver and the transmitter based on the precise estimate.