John J Fay

Address:

33 Frank St, Somerset, MA 02726

Phone:

(508)6796744

VIN:

5TFUY5F13CX266731

Make:

TOYOTA

Model:

TUNDRA

Year:

2012

US Patent:

6356600, Mar 12, 2002

Filed:

Apr 21, 1998

Appl. No.:

09/063800

Inventors:

Ivars P. Kirsteins - Cranston RI
Sanjay K. Mehta - Norwich CT
John W. Fay - Groton CT

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H03D 100

US Classification:

375340, 708520

Abstract:

A system for detecting unknown broadband signals in noise consisting of non-stationary narrowband components and a stationary colored broadband component includes a sensor which collects data in which a signal of interest may be found and generates a received data stream. A preprocessor operates on the received data stream to generate training and detection vectors corresponding to noise only and noise plus signal intervals of the received data stream, respectively. A spectrum processor receives the training and detection vectors and generates cleaned broadband spectrum estimates {tilde over (C)} (Æ) and {tilde over (C)} (Æ) from the training and detection vectors, respectively, by adaptively separating non-stationary tonal components from the stationary broadband component using modified multiple taper spectral estimation combined with maximum likelihood tonal removal. The cleaned broadband spectrum estimates {tilde over (C)} (Æ) and {tilde over (C)} (Æ) are passed to a detection processor which detects unknown broadband signals within the received data stream using a power law detection process which operates on normalized (whitened) broadband signals {tilde over (C)} (Æ)/ (Æ) to identify the number and location of the DFT bins occupied by a detected signal, if present.

US Patent:

62497626, Jun 19, 2001

Filed:

Apr 1, 1999

Appl. No.:

9/287169

Inventors:

Ivars P. Kirsteins - Cranston RI
Sanjay K. Mehta - Bristol RI
John W. Fay - Groton CT

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01L 1102
G01L 2102

US Classification:

704233

Abstract:

A method for separation of acoustical data into narrowband and broadband time series components includes the steps of: constructing a data matrix in which time series samples of acoustical data are arranged in a forward-backward linear predictor matrix; decomposing a subband of the matrix into an in-band component and an out-of-band component; estimating narrowband components; estimating out-of-band leakage; removing the in-band narrowband component and the out-of-band narrowband component; repeating sequentially the afore mentioned five steps until narrowband components from all of the subbands of the matrix are removed from the acoustical data; and reconstructing the broadband time series; whereby to provide a narrowband time series estimate indicative of the presence of a signal in the acoustical data.