Communications: directive radio wave systems and devices (e.g. – Radar ew
Patent
1977-02-28
1994-01-25
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
342 25, G01S 742, G01S 1390
Patent
active
052819710
ABSTRACT:
A radar system is capable of detecting and classifying rotating targets such as rotating antennas. Particularly, unfriendly radar installations can be detected and classified by a synthetic aperture radar system, which may be carried by an aircraft.
The radar reflection signal (echo) received by a synthetic aperture radar system and reflected from a rotating object will appear as a series of image points, or pulses, at the same range, but spaced apart by some apparent distance or frequency. By knowing the apparent distance (d) between adjacent image points, the range (R) to the target, the time of integration (T.sub.o) of the radar system, the velocity (V.sub.o) of the detecting aircraft, the angle (B.sub.o) to the target, and the wavelength of the aircraft's radar signal (.lambda.), the rate of rotation (F) of the target may be determined from ##EQU1## where S is the azimuthal resolution expressed by ##EQU2## Furthermore, by knowing the azimuthal extent (W) of the apparent target (namely, the apparent width of the entire set of image points), the width or diameter (L) of the target may be ascertained ##EQU3## Apparatus for classifying rotating targets is provided to permit on-board determination of the class of target detected.
REFERENCES:
patent: 3259883 (1966-07-01), Rabinow et al.
patent: 3432674 (1969-03-01), Hobrough
J. Rabinow, "The Present State of the Art of Reading Machines", Pattern Recognition, edited by L. N. Kanal, Proceedings of IEEE Workshop on Pattern Recognition, Puerto Rico, Oct. 24-26, 1966, pub. 1968, Thompson Book Company, pp. 15-19.
R. B. Hennis, "Recognition of Unnurtered Characters in a Multifont Application", Pattern Recognition, edited by L. N. Kanal, Proceedings of IEEE Workshop on Pattern Recognition, Puerto Rico, Oct. 24-26, 1966, pub. 1968, Thompson Book Company, pp. 85, 86.
Control Data Corporation, "A Proposal for a Concealed Target Detection System" to U.S. Air Force Avionics Laboratory, Nov. 1973, pp. 3-50 to 3-53.
J. C. Kirk, Jr., "A Discussion of Digital Processing in a Synthetic Aperture Radar", IEEE Transactions on Aerospace and Electronics Systems, vol. AES-11, No. 3, May 1975, pp. 326-337.
J. C. Kirk, Jr., "Motion Compensation for Synthetic Aperture Radar", IEEE Transactions on Aerospace and Electronic Systems, vol. AES-11, No. 3, May 1975, pp. 338-348.
S. Winograd, "On Computing the Discrete Fourier Transform", Proceedings of the National Academy of Science, vol. 73, No. 4, Apr. 1976, pp. 1005-1006.
Ceridian Corporation
Tubbesing T. H.
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