Accession Number : ADD017533

Title :   Adaptive Infinite Impulse Response (IIR) Filter System.

Descriptive Note : Patent, Filed 26 Apr 94, patented 20 Jun 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Herchen, James R , Jr ; Lindgren, Allen G

Report Date : 20 Jun 1995

Pagination or Media Count : 10

Abstract : An adaptive filter system for use in connection with a reference system that receives an input u(s) and generating in response thereto a reference output y(s) defined by a reference transfer function H(s)=c(sI-A)(exp -1)b+d, where I is the identity matrix and matrix A, vectors b and c, and scalar d are reference parameters, and s is a variable for the input. The adaptive filter system comprises a system model module, a gradient filter module, an adjustable parameter module, and a parameter adjustment module. The system model module receives the input u(s) and generates in response thereto and in response to a plurality of model parameters matrix A', vectors b' and c', and scalar d, an intermediate model output vector x'(s)=u(s)I-A' and a model output y'(s)=cx'(s)b+d. The gradient filter module receives the intermediate model output vector x'(s) and gener- ates a gradient output vector w(s)= integral over x'(s) + A'w(s)ds. The adjustable parameter module receives the gradient output vector w(s) from the gradient filter module, x'(s) from the system model module and input u(s) and generates dot products with respective adjustable parame ters alphe, beta and delta to generate a model adjustment value v'(t). The parameter adjustment module generates ad- justed parameters for use by the adjustable parameter module in response to current values of adjustable parameters and an error value e(s)=y(s)-Y'(S) + V'(S).

Descriptors :   *RECURSIVE FILTERS, *PATENTS, MATHEMATICAL ANALYSIS, ADAPTIVE FILTERS, DIGITAL FILTERS

Subject Categories : Operations Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE