Accession Number : ADA136946

Title :   Adaptive Cancellation Techniques.

Descriptive Note : Final rept.

Corporate Author : RAYTHEON CO GOLETA CA ELECTROMAGNETIC SYSTEMS DIV

PDF Url : ADA136946

Report Date : 21 Nov 1983

Pagination or Media Count : 129

Abstract : An adaptive signal canceller has been evaluated for the enhancement of pulse signal reception during the transmission of a high power ECM jamming signal. The canceller design is based on the use of DRFM(Digital RF Memory) technology as part of an adaptive multiple tapped delay line. The study includes analysis of relationship of tap spacing and waveform bandwidth, survey of related documents in areas of sidelobe cancellers, transversal equalizers, and adaptive filters, and derivation of control equations and corresponding control processes. The simulaiton of overall processes included geometric analysis of the multibeam transmitting antenna, multiple reflection sources and the receiving antenna; waveforms, tap spacings and bandwidths; and alternate control algorithms. Conclusions are provided regarding practical system control algorithms, design characteristics and limitations. (Author)

Descriptors :   *Cancellation, *Suppressors, *Adaptive filters, *Radiofrequency interference, *Adaptive systems, *Multiple beam antennas, Noise, Sidelobes, Algorithms, Equations, Transmitting, Reflection, Reception, Bandwidth, Pulses, Sources, Geometry, Control, Signals, Waveforms

Subject Categories : Electrical and Electronic Equipment
      Radio Countermeasures
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE