Patent ID: 8416863
Filing Date: 2013-04-09
Classification: G01S,H04B

Abstract:
1. A multi-path signal detector for a spread spectrum signal, comprising: correlators receiving the spread spectrum signal for computing a plurality of correlation functions, wherein each correlation function correlates the spread spectrum signal to a reference signal delayed by a selected delay value; a first detector for detecting an asymmetry in the computed correlation functions to indicate the presence of multi-path; a first filter for removing noise from an output signal from the first detector; a second detector for detecting a non-line-of-sight condition having no line-of-sight component in the spread spectrum signal responsive to the indication from the first detector of the presence of multi-path, wherein the second detector for detecting a non-line-of-sight condition detects an abrupt change in code phase when the asymmetry in the computed correlation function from the first detector disappears; and a second filter for removing noise from an output signal of the second detector.