Jackson A Mobbs

6356510, Mar 12, 2002

Feb 4, 2000

09/498348

Ronald A. Wagstaff - Slidell LA
Jackson A. Mobbs - Gulfport MS

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

H04B 106

367135, 367901

A novel method and apparatus for signal processing are described which discriminate between signals and noise based on the magnitude of the phase fluctuations. In an embodiment of the invention, the governing equations of the process adaptively change in response to the phase and amplitude characteristics of the signals being received for processing. In an embodiment of the invention, an automatic detection method and apparatus is described which has the capability to alert an operator of the presence of signals having phase fluctuation characteristics which match a set of preset conditions (e. g. small fluctuations, medium fluctuations, or large fluctuations).

6418083, Jul 9, 2002

Jan 12, 2001

09/759765

Ronald A. Wagstaff - Oxford MS
Jackson A. Mobbs - Cabot AR

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

H04B 106

367135, 367901, 367124

A method for characterizing degree of phase fluctuation of a signal and a signal processor for accomplishing such characterization, is described, in which a time series of complex data vectors are received, initial spectral processing is accomplished, an estimate of the excess phase rotation is made, and a quantity WSC equal to is calculated. Based on the different phase behavior of signal and noise, the quantity WSC is compared to a preset threshold value to determine whether the received signal is phase stable signal or whether it is noise or clutter. In another embodiment of the invention, the quantity WSC is used to modify the results of another signal processor to improve the signal to noise ratio of the other signal processor. For example, in one embodiment, the results of a processor based on the average signal amplitude AVGPR is divided by the quantity WSC raised to a real exponent, leading to a reduction in noise and easier discrimination of signals. In other embodiments, the fluctuation of the amplitude of a received signal is characterized by determining a value Based on the behavior of noise/clutter compared to signal, the quantity WISPR is compared to a preset quantity to discriminate between noise and signal.

6629063, Sep 30, 2003

Jul 30, 2001

09/916594

Ronald A. Wagstaff - Slidell LA
Jackson A. Mobbs - Cabot AR

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

G01S 380

702189, 702190, 367135, 367124

An acoustic signal processor that samples acoustic data, performs a spectrum analysis of the sampled acoustic data, stores the acoustic data in corresponding frequency bins, and then filters acoustic data stored in a frequency bin by applying a power-law arithmetic operation to the frequency bin acoustic data, such that the power-law arithmetic operation is adaptively changed based on an order dependent determination of whether the frequency bin acoustic data is representative of noise or clutter, or whether it is representative of a signal of an object.

6353578, Mar 5, 2002

May 27, 1999

09/320697

Ronald A. Wagstaff - Slidell LA, 70461
Jackson A. Mobbs - Gulfport MS, 39503

G01S 3808

367125, 367118, 367124

The invention involves a computationally simple and fast method for aligning the phases of complex signals (real (in phase) and imaginary (quadrature) components) before performing a coherent (in phase components) or vector sum, thus achieving the high gains of in phase summations without pre-processing overhead to determine an optimum progression of phase shifts to enable in phase summations. The method of the invention for aligning the phases, without preprocessing to get an optimum set of phase shifts, uses the temporal relationship that exists in the phase angles of successive vectors that occur evenly spaced in time.