Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Reexamination Certificate
2007-04-17
2007-04-17
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
C342S052000, C342S053000, C342S061000, C342S067000, C342S089000, C342S094000, C342S104000, C342S105000, C342S118000, C342S128000, C342S129000, C342S146000, C342S147000, C342S149000, C342S175000, C342S195000, C342S196000
Reexamination Certificate
active
10956643
ABSTRACT:
An improved system is provided for aiming a shotgun-based or other countermeasure system so as to be able to countermeasure incoming rockets or projectiles. In one embodiment a shotgun aimed and controlled by the subject system projects a pattern of pellets to intercept a rocket-propelled grenade or incoming projectile. The fire control system uses a CW two-tone monopulse radar to derive range and angle of arrival within 150 milliseconds, with range and angle of arrival measurements having approximately twice the accuracy of prior CW two-tone monopulse radars. The improvement derives from using all of the information in the returned radar beams and is the result of the recognition that one can use the Sum and Difference signals to assemble a two-by-two Rank One matrix that permits using singular value decomposition techniques to generate range and angle of arrival matrices in which all available information is used and in which noise is eliminated.
REFERENCES:
patent: 2907999 (1959-10-01), Wadley
patent: 5402129 (1995-03-01), Gelner et al.
patent: 6087974 (2000-07-01), Yu
patent: 6404379 (2002-06-01), Yu et al.
patent: 6720910 (2004-04-01), Yu
BAE Systems Information and Electronic Systems Integration Inc.
Gregory Bernarr E.
Long Michael J.
Tendler Robert K.
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