One-bit autocorrelation envelope detector

摘要

An apparatus for automatically detecting the existence of an unknown narrow-band signal in the presence of wide-band noise-like interference. The apparatus performs a one-bit autocorrelation at a delay time such that wide-band signals are decorrelated while narrow-band signals remain correlated. Additionally, the autocorrelation is separated into quadrature components which are re-combined to give an estimate of the envelope of the autocorrelation of the input signal.