Accession Number:

ADD018902

Title:

A General Fluctuation Sensitive Filter

Descriptive Note:

Patent application, filed 30 Apr 98

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1998-04-30

Pagination or Media Count:

13.0

Abstract:

An apparatus and method for filtering the effects of large amplitude signal fluctuations from elements of the cross-spectral density matrix of a detector array. The outputs of the array are sampled T times, and the values of each element of the matrix formed by using Summation of i1 to T of ZliZmiabsolute value of ZliZmik where Zli is the complex output of an sensor of the array at time i Zmi is the complex conjugate of the output of an array sensor at said time i and k is an integer greater than 1. Because of the exponent k, small, relatively constant, terms will dominate, reducing the effect of large amplitude fluctuations. Preferably, the above value will be scaled according to Summation of i1 to T of absolute value of ZliZmi-k-1 which, besides being similarly filtered by the exponential terms, the resultant matrix element will have a magnitude corresponding to the actual power of the detected signal, after filtering.

Subject Categories:

  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE