MULTICHANNEL INTERFEROMETER WITH PHASE GENERATED CARRIER DEMODULATION AND QUADRATURE ERROR CORRECTION

摘要

Apparatus for eliminating sign uncertainty in a coherent phase generatedcarrier demodulator in a multi-channel sensor system has a downconverter arrayarranged to separate the in-phase component I and the quadrature phasecomponent of the sensor output for each channel. A coordinate transformer usesthe in-phase component and quadrature phase component to calculate anarctangent for the phase angle for each channel. A digital signal processoradds 180~ to each arctangent circulation for which the tangent is a negativenumber.