Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Missile or spacecraft guidance
Patent
1998-08-03
2000-07-11
Gregory, Bernarr E.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Missile or spacecraft guidance
342 73, 342 74, 342 75, 342 80, 342147, 342149, 342195, 342 13, 342 14, 342 16, 244 31, 244 315, 244 319, G01S 1372
Patent
active
060879742
ABSTRACT:
A monopulse system generates sum (.SIGMA.), elevation difference (.DELTA..sub.EL), azimuth difference (.DELTA..sub.AZ), and double difference (.DELTA..sub..DELTA.) signals, and generates a covariance matrix. The covariance matrix is decomposed to produce at least the principal eigenvector. The location or angular direction within the main beam of a single target is determined from the real component of the quotient of elements of the principal eigenvector, by the use of a look-up table. In another embodiment of the invention, the eigenvalues are generated from the covariance matrix, and the number of significant eigenvalues determines the number of targets within the main beam. If a single target is found, its location is found as described above. If two targets are found in the main beam, the locations of the two targets are determined by a closed-form solution of quadratic equations. A missile using a monopulse radar according to an aspect of the invention determines the presence of two targets within the main beam, which targets may be a real target and a decoy, and uses extrinsic information to identify a selected target as being the true target. The missile is homed in the direction of the selected target.
REFERENCES:
patent: 5371506 (1994-12-01), Yu et al.
patent: 5382954 (1995-01-01), Kennedy, Jr. et al.
Checkovich P. J.
Gregory Bernarr E.
Lockheed Martin Corporation
Meise W. H.
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