DEPARTMENT OF THE NAVY WASHINGTON D C
Pagination or Media Count:
The patent is for an IFF-System which cannot be duplicated by enemy aircraft and therefore is superior to the known systems. This invention makes use of low frequency pulse generators and digital counters in both the friendly aircraft and at the interrogation center. A transmitted signal sent upon interrogation represents in coded form the digital count accumulated in the digital counter of the craft. The pulse generators and the digital counters in both the aircraft and the radar equipment at the interrogation center are synchronized, such that a transmitted signal when decoded will compare in digital form with the accumulation in the counter at the interrogation center and thus identify the craft as friendly.
- Active and Passive Radar Detection and Equipment