IMPROVED RADIO DOPPLER DETECTORS
AIRBORNE INSTRUMENTS LAB DEER PARK NY
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This report describes the program of RF doppler detector improvement sponsored by the FAA and undertaken to eliminate deficiencies in the radio detectors used in the TRACE installation at NAFEC. Previous detectors detected aircraft but were also triggered by small, close-in, unwanted targets such as birds and rainfall. Four X-band FM-CW doppler detectors and two dual-antenna CW S-band doppler detectors that were modified from GFE supplied by the FRE DEVELOPED UNDER THIS PROGRAM AND DELIVERED TO NAFEC for test and experimentation. These detectors eliminate or greatly reduce detection of the unwanted targets by producing a dead zone immediately in front of the detector. The X-band FM-CW detector produces this zone where detection is eliminated by a frequency modulation technique, while the CW S-band unit uses physical separation of the receiver and transmitter antennas to achieve the same result. In addition, audio analysis equip ment for storing and processing received signals was furnished to the FAA to aid in testing the equipment.
- Active and Passive Radar Detection and Equipment