Kwang S Min

US Patent:

52556085, Oct 26, 1993

Filed:

Dec 16, 1992

Appl. No.:

7/993742

Inventors:

Kwang S. Min - Commerce TX
Hisook L. Min - Commerce TX

Assignee:

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

International Classification:

F42C 1106

US Classification:

102215

Abstract:

Intelligent hard-target weapons provide a real-time estimation of a medium as the weapon is penetrating through it. Input signals are provided by an accelerometer used as a primary sensor. On-line concurrent processing of the data of a specific length facilitates a few different modes of feature extraction. The processor provides a robust, real-time decision making for the fuze utilizing sensor signals (accelerometer data). The feature sets utilized include (1) amplitude profiles of the signals, (2) their derivative profiles, and (3), the measure of their abrupt changes. The purpose is to provide for detonation at the proper point as the high-speed penetrator passes through various layers such as concrete, steel, dirt, sand, etc. on its way to a valuable buried target. Real-time decision making is provided for the fuze utilizing accelerometer data.

US Patent:

51022184, Apr 7, 1992

Filed:

Aug 15, 1991

Appl. No.:

7/746690

Inventors:

Kwang S. Min - Fort Walton Beach FL
Hisook L. Min - Fort Walton Beach FL

Assignee:

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

International Classification:

G01C 308

US Classification:

356 5

Abstract:

For all-weather active optical proximity sensors, the technique extracts a proper target signal from the mixture of target and aerosol returns. A waveform extraction method and a spectral extraction technique are used. The waveform extraction method examines the changes of the mixed signals in the time domain by using derivatives and other pertinent parameters. The spectral extraction method extracts the target signature by bandpass filtering the transform coefficients after taking orthogonal transformations of the mixed data. Using the former, a portion of a data set is segmented to include target and aerosol returns only. The latter method is applied to the segmented portion. An outline of the method is stated in the following. (1) Smooth the data distribution curve. (2) Using the waveform extraction technique, identify the critical interval which may represent the target return signal, if any.