Lockheed Martin Corporation

Lockheed Martin Corpora Tion

Tod M Schuck

Mark A Friesel

David B Reese

A Doppler radar system includes a Doppler radar processor, a memory in communication with radar processor and a transmit/receive controller. The memory includes computer readable instructions that cause the Doppler radar processor to transmit a radar signal toward the airborne object at a frequency; receive reflected radar signals off of the airborne object, including frequencies produced as a result of Doppler effect due to relative motion between features of the airborne object and the radar system; and Fourier transform the received signals into the frequency domain. Peak frequencies and their harmonic frequency families are sorted and identified. The logarithm of the Fourier transform is calculated to generate a quefrency cepstrum. To identify features producing cyclic, periodic Doppler frequency patterns, peak quefrencies and rahmonic families associated with a quefrency peak are sorted and identified. The rotational state of the airborne object based on the identified quefrency families is determined.

Radar system and method for determining a rotational state of a moving object

A system for evaluating the threat posed by sensed targets includes sources of predetermined threat hypotheses and doctrinal information, and a Choquet threat discernment processor to identify a threat level represented by each target. A threshold arrangement is coupled evaluates the threat level, and deems those threat levels above the threshold to be suitable for the taking of countermeasures.

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Lumberton, NJ, United States of America

Tod M Schuck