Accession Number : ADD008684

Title :   Control Device for Steerable Null Antenna Processor.

Descriptive Note : Patent Application,


Personal Author(s) : Keen,James

Report Date : 01 Jul 1981

Pagination or Media Count : 14

Abstract : A radio receiving system partially overcomes jamming and other interference by receiving on a narrow selected frequency which is rapidly changed, i.e., fast frequency hopping (FFH). The system includes a broadband receiving antenna array and a steerable null antenna processor which creates an antenna null pattern. A control device connected to the FFH radio connects a portion of the intermediate frequency (IF) of the radio to a bank of three narrowband IF filters in the control device. The output of the first IF filter, at the IF frequency, provides the signal (S) level and the outputs of the second and third filters, which are offset from the IF frequency, are summed to provide the interference (I) level; the I and S levels being used to control the antenna processor means. (Author)

Descriptors :   *Beam steering, *Signal processing, Radio receivers, Antijamming, Antennas, Broadband, Nulls(Amplitude), Frequency agility, Control systems, Intermediate frequencies, Bandpass filters, Narrowband

Subject Categories : Countermeasures
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE