Patent ID: 8253627

Claim:
An apparatus to determine the position of a user terminal, comprising: a receiver configured to receive, at the user terminal, a wireless digital radio signal; a pseudorange module configured to determine a pseudorange between the receiver and a transmitter of the digital radio signal based on the digital radio signal; and a position module configured to determine the position of the user terminal based on the pseudorange and a location of the transmitter; wherein the digital radio signal comprises a NRSC-5 signal, wherein said NRSC-5 signal is modulated using orthogonal frequency division multiplexing (OFDM) and is composed of a plurality of adjacent narrowband subcarriers, and further comprising: a correlator configured to correlate the digital radio signal with a reference waveform; wherein the pseudorange module is configured to determine the pseudorange based on an output of the correlator.