George Stephen Dillard

US Patent:

43981976, Aug 9, 1983

Filed:

Sep 11, 1981

Appl. No.:

6/301088

Inventors:

George M. Dillard - San Diego CA

Assignee:

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

International Classification:

H04B 700

US Classification:

343100LE

Abstract:

The present invention is digital open-loop sidelobe canceller for decorreing signals by removing correlated components. The invention has inputs for receiving n pairs of digital sample values representing the digitized in-phase components and quadrature-phase components of the output of the main radar receiver and also of at least one auxiliary radar receiver. These data samples are stored in memory for later processing and are also furnished to computation networks which calculate weighting coefficients which are processed as real numbers. These real number weighting coefficients are utilized to subtract calculated real number values from the sample values representing the digitized in-phase and quadrature-phase components of the output of the main radar receiver.

US Patent:

41287592, Dec 5, 1978

Filed:

Nov 21, 1977

Appl. No.:

5/853157

Inventors:

Barry R. Hunt - San Diego CA
George M. Dillard - San Diego CA
Henry F. Taylor - San Diego CA

Assignee:

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

International Classification:

H04B 900

US Classification:

250199

Abstract:

A fiber optic delay line filter receives light energy input signals repretative of any form of temporally varying signals such as electrical or acoustical, for example. A plurality of fiber optic light paths each having a determinably variant optical propagation delay, receives and transmits the light energy signals. A photo responsive means receives the delayed output light energy signals transmitted by the plurality of fiber optic light paths and produces a single electrical output signal as a function of the sum of the delayed output light energy signals, thus performing a filtering or correlation function. In a preferred embodiment, an injection laser or light emitting diode may be employed as the means for converting the temporally varying input signals to commensurate light energy signals. In a variant embodiment, a single fiber optic light path, having a partially reflective surface at each end, gives effect to multiple reflective transmissions along the length of the fiber optic light path which are then detected by a photo responsive device, providing a narrowband filter output as a function of the length and number of multiple reflective transmissions.

US Patent:

40757030, Feb 21, 1978

Filed:

Nov 1, 1976

Appl. No.:

5/737877

Inventors:

George M. Dillard - San Diego CA

Assignee:

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

International Classification:

G06F 1534

US Classification:

364715

Abstract:

An apparatus for estimating the mean level of a stochastic process such as ould be observed at the output of a radar, communications, or sonar receiver and for using the mean level to provide a threshold with which possible signal samples are compared to determine the presence or absence of the signal. The estimated mean level is used in lieu of a priori information when it is unreasonable to assume that the characteristics of the stochastic process are known. A first order recursive filter receives signal samples and provides an output which is proportional to the mean of the stochastic process. The output of the first order recursive filter Y. sub. n is multiplied by the factor T such that the product TY. sub. n is a threshold quantity which is compared with the input signal samples X. sub. n. When X. sub. n exceeds TY. sub.

US Patent:

42142393, Jul 22, 1980

Filed:

Apr 2, 1963

Appl. No.:

4/270119

Inventors:

George M. Dillard - San Diego CA

Assignee:

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

International Classification:

G01S 902

US Classification:

343 5VQ

Abstract:

1. A track detection system comprising; receiving means for receiving reflected radio frequency signals from an oct in a given medium; said receiving means for receiving said signals at a predetermined scan rate; storage means operatively coupled to said receiving means for storing information corresponding to reflected radio frequency signals from an object in a given medium; referencing means included in said storage means for referencing received reflected radio frequency signals with respect to the azimuth from which the reflected information is received during a scan of said receiving means; said storage means being adapted for storing a multitude of scans; ordering means operatively coupled to said storage means for accepting information from said storage means and sorting said information according to range and sector where range is broken up into a discrete number of increments referred to as range bins and where range is the distance from the receiving means to an object in a medium and sector is the azimuth from which a signal is received at a given time; other storage means operatively connected to said ordering means for storing information corresponding to the number of hits per range bin where hits are defined as the times when an object is illuminated by radio frequency energy; said number of hits per range bin having been stored in said first mentioned storage means as range information; and track detector means operatively connected to said other storage means for making a decision as to the absence or presence of a track in the medium.

US Patent:

40230287, May 10, 1977

Filed:

Aug 20, 1974

Appl. No.:

5/498888

Inventors:

George M. Dillard - San Diego CA

Assignee:

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

International Classification:

G06F 1534

US Classification:

235156

Abstract:

A wholly digital system for computing the discrete Fourier transform of sequentially received data in a recursive fashion. Two parallel shift registers store and shift the real and imaginary components of the complex number X. sub. k + iY. sub. k. The data in the parallel registers are successively shifted one bit per strobe in response to receipt of new data. Additional logic operates recursively on successive data inputs to compute the discrete Fourier transform.