Accession Number : ADD005497

Title :   Receiver for Detecting and Analyzing Amplitude or Angle Modulated Waves in the Presence of Interference.

Descriptive Note : Patent,


Personal Author(s) : Allen ,Joseph A ; Fuschetto,William R

Report Date : 02 May 1978

Pagination or Media Count : 5

Abstract : This receiver includes in its IF channel a summing network by means of which the output of a calibrated reference oscillator may be added to the received signals. The frequency and amplitude of the reference oscillator are adjusted to match those of a desired one of several co-channel signals which may be simultaneously present in the IF channel. The combined signals are amplitude limited and applied to a frequency deviation detector in which the wide frequency deviations caused by the interaction of the reference and desired signal are detected. The technique can be used to demodulate angle or amplitude modulated signals obscured by jamming signals and to measure the frequency and amplitude of signals which are similarly obscured. (Author)

Descriptors :   *Patents, *Radio receivers, *Demodulation, *Radio interference, *Radio antijamming, Intermediate frequencies, Bandpass filters, Frequency modulation, Radiofrequency oscillators, Amplitude modulation, Phase modulation, Radio signals

Subject Categories : Radio Countermeasures
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE