Method and apparatus for detecting and tracking coded signals in a noisy background environment
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United States of America Patent
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Jan 27, 2004
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N/A
app pub date -
Apr 16, 1999
filing date -
Apr 16, 1999
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Expired
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Abstract
A method and apparatus for detecting and tracking a coded signal within a noisy background environment, wherein the signal is correlated over subintervals of time both in-phase and in quadrature, stored indices which represent all possible paths of the signal phase are retrieved, in-phase and quadrature sums are formed wherein the first term of the in-phase sum is the in-phase correlated signal over the first time subinterval and the first term of the quadrature sum is the quadrature correlated signal over the first time subinterval and wherein successive terms are correlated signals from successive time subintervals which are selected based upon the value of the retrieved index, and the true phase path of the signal is estimated by determining the correlation sum having the maximum absolute value.
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