DOPPLER CONTROL CHANNEL FOR RADAR

摘要

PURPOSE: To improve safety by providing a device to select one of a plurality of targets while monitoring a return echo signal from the one target. CONSTITUTION: The tuning band pass frequency of SBPF gives an output frequency of VFC538 divided by 256 'S8' and serves as frequency of SBPF clock S9. When a PLL is fixed on one of a large number of frequencies developed at a Doppler channel 'S', the frequency is selected and maintained in a range channel 'T2U2". These frequencies generate radar echoes from a large number of targets, signal echoes returned through a number of paths and an echo from a reflecting object which is too far to be a target of interest. When a phase fixed loop error voltage 'S6' is down to zero, it also indicates a phase fixed condition BB3'. At this point, the frequency output is stabilized to 'S9' 128 times a Doppler frequency 'S2'.