Phase measurements using pseudo-random code
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United States of America Patent
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Jun 12, 1990
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N/A
app pub date -
Nov 1, 1985
filing date -
Nov 1, 1985
priority date (Note) -
Expired
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Abstract
Signal phase delay may be accurately measured by transmitting a pseudo-random noise coded reference signal, deriving in-phase and quadrature components of the received coded signal and then separately decoding the in-phase and quadrature components. This technique effectively compresses the transmitted signal pulse to a very narrow width (thereby simplifying discrimination of separate pulses with similar arrival times) while magnifying the pulse amplitude (thereby enhancing the signal to noise ratio).
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