Asymmetry technique for multipath mitigation in pseudorandom...

Details Asymmetry technique for multipath mitigation in pseudorandom... Asymmetry technique for multipath mitigation in pseudorandom...

2011-01-25

2011-01-25

Payne, David C (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

C375S316000, C375S142000, C375S147000, C375S150000

Reexamination Certificate

active

07876807

ABSTRACT:
This invention is directed to a method for estimating and compensating for multipath errors in a pseudorandom noise ranging receiver. The method exploits the asymmetry of the correlation function and proportionately relates it to the magnitude of multipath error. In a pseudorandom noise ranging receiver, the correlation function is obtained by generating the local pseudorandom noise sequences at different programmed non-uniform phases resulting in non-uniformly spaced correlators. Numerically controlled oscillators, code generators and shift registers are programmed to determine the correlation values at non-uniformly distributed points on a correlation function. Curve fitting is undertaken to determine the code phase at which the correlation function peaks. A proportionality constant is applied to the measure of asymmetry of the correlation function to determine the multipath error in the pseudorandom noise signal. A filter is used to detect and eliminate outliers.

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