System and method for mitigating severe multipath interference for geolocation and navigation
First Claim
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1. A method of mitigating multipath interference in a received signal comprising the steps of:
- (a) receiving at a user a plurality of RF signals over time intervals from a transmitter, wherein at least one of the plurality of RF signals is a line-of-sight signal and wherein at least one of the plurality of RF signals is a multipath signal;
(b) correlating each of the plurality of received signals with delayed versions of a corresponding replica waveform to form a two dimensional matrix, where matrix elements in one dimension correspond to different time intervals;
(c) estimating a frequency spectrum of the two dimensional matrix, wherein the estimating the frequency spectrum includes at least one of MUSIC, modified MUSIC, APES, maximum entropy methods, and subspace fitting methods; and
(d) identifying, and separating out a signal path of the at least one line-of-sight signal and the at least one multipath signal from the spectrum by a value of phase rates associated with these paths.
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Abstract
A system and method for mitigating multipath interference of signals in environments to determine the line of sight signal propagation.
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Citations
16 Claims
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1. A method of mitigating multipath interference in a received signal comprising the steps of:
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(a) receiving at a user a plurality of RF signals over time intervals from a transmitter, wherein at least one of the plurality of RF signals is a line-of-sight signal and wherein at least one of the plurality of RF signals is a multipath signal; (b) correlating each of the plurality of received signals with delayed versions of a corresponding replica waveform to form a two dimensional matrix, where matrix elements in one dimension correspond to different time intervals; (c) estimating a frequency spectrum of the two dimensional matrix, wherein the estimating the frequency spectrum includes at least one of MUSIC, modified MUSIC, APES, maximum entropy methods, and subspace fitting methods; and (d) identifying, and separating out a signal path of the at least one line-of-sight signal and the at least one multipath signal from the spectrum by a value of phase rates associated with these paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification