Binary offset carrier M-code envelope detector

Details Binary offset carrier M-code envelope detector Binary offset carrier M-code envelope detector

2004-06-22

2009-06-30

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S149000

Reexamination Certificate

active

07555033

ABSTRACT:
An M code envelope detector receives an incoming binary offset carrier (BOC) signal, such as the M code signal, and generates inphase BOC and quadraphase BOC signals, separated by an offset, that have respective ambiguous correlation envelopes, that when combined, provide a near unimodal correlation function with respect to code phase error of the BOC signal having an inherent multimodal autocorrelation function, with the near unimodal correlation envelope being tracked by early and late code replicas at broad one chip phases for providing unambiguous but nonlinear code phase error tracking, which detector is then further improved with the use of code replicas having narrow partial chip phases, such as ⅛ chip phases, for providing near linear code phase error tracking for unambiguous and accurate code tracking of the BOC signal.

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