Primary radar with a secondary-radar interrogating device

摘要

The operation of secondary-radar devices leads to unwanted loading of the radio room even with target-controlled interrogation of the transponders. To further reduce this loading, control pulses for triggering an interrogation are only generated when two primary-radar echo signals of the same origin coincide, in that the echo signals from the output of a device for suppressing permanent echoes are compared with the echo signals obtained from the output of an additional signal processing device, for example a tracker, in a gate circuit. <IMAGE>