Accession Number : ADD009800

Title :   Adaptive Interference Tracker for Suppression of Narrow Band Interference.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Roeder,Allan W

Report Date : 14 Sep 1982

Pagination or Media Count : 7

Abstract : Adaptive filtering of narrow band interference is achieved by means of a circuit that automatically estimates the amplitude and frequency of narrow band interference in the presence of a wide band signal. The estimate of the interference is substracted from the input signal. Sample data baseband signals are processed in order to estimate the frequency and amplitude of interfering signals. The filter employs two tracking loops which act together to provide a second order tracking function. The first tracking loop provides a smoothed estimate of the interference. The second tracking loop provides a signal that adjusts a phase shifter to track the interfering signal frequency. Subtraction of the estimated interference from the input signal provides an output signal with attenuated interference and that is only slightly distorted. (Author)

Descriptors :   *Patents, *Adaptive filters, *Suppressors, *Phase shift circuits, *Broadband, Narrowband, Tracking, Signals, Input, Output, Frequency, Functions, Interference, Filters, Loops

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE