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PROCÉDÉ ET SYSTÈME DE DÉTECTION EN QUADRATURE À SÉPARATION TEMPORELLE D'EFFETS DOPPLER DANS DES MESURES DE DISTANCE OPTIQUE
PROCÉDÉ ET SYSTÈME DE DÉTECTION EN QUADRATURE À SÉPARATION TEMPORELLE D'EFFETS DOPPLER DANS DES MESURES DE DISTANCE OPTIQUE
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摘要
Doppler correction of broadband LIDAR includes mixing, during a first time interval, a returned optical signal with an in-phase version of the transmitted signal to produce a first mixed optical signal that is detected during the first time interval to produce a first electrical signal. During a non-overlapping second time interval the returned optical signal is mixed with a quadrature version of the transmitted signal to produce a second mixed optical signal that is detected during the second time interval to produce a second electrical signal. A complex digital signal uses one of the digitized electrical signals as a real part and a different one as the imaginary part. A signed Doppler frequency shift of the returned optical signal is determined based, at least in part, on a Fourier transform of the complex digital signal. A device is operated based on the Doppler frequency shift.
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