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Hybrid Consistency Framework for Distributed Annotation Records

A laser radar system for detecting objects transmits a laser beam which is frequency modulated by the motion of scanning mirrors, which scan the beam across an object to be imaged. The return beam, reflected by the object, is combined with the local oscillator beam, and the frequency difference is detected. This frequency difference is obtained by the Doppler induced frequency modulation which results from the motion of the scanning mirrors. A signal corresponding to this frequency difference may be provided to the x axis of an oscilloscope for displaying the image. The x and y axis outputs of the oscilloscope are supplied with signals used to control the scanning of the x and y-scanning mirrors, to synchronize display with the scanning of the object.