A General Fluctuation Sensitive Filter
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 i=1 to T of ?ZliZ(*)mi)/absolute value of ZliZ(*)mik! where Zli is the complex output of an sensor of the array at time i; Z(*)mi 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 i=1 to T of absolute value of ZliZ(*)mi(-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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1998
- Accession Number
- ADD018902
Entities
People
- Ronald A. Wagstaff
Organizations
- United States Department of the Navy