Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1986-05-02
1987-11-17
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342159, 342196, 342 90, G01S 1389
Patent
active
047076976
ABSTRACT:
In accordance with a first arrangement, a non-coherent, pulse radar transmitter emits N-sequential signals of differing frequencies at predetermined time intervals, the transmitted pulses being directed toward a given target area of interest. Further included is a radar receiver for detecting and processing the composite radar return signal samples of N differing frequencies which are reflected from a plurality of point scatterers located in the area of interest. The varying D.C. interference signal of the plural radar return signal samples occasioned by the differing frequencies are detected and a one-dimensional Fourier transformer is performed on that composite radar return signal samples to facilitate target identification. A programmed processor is used to dervie a plurality of feature characteristics from the Fourier transform of the detected radar return signals and the features so computed are compared with features characteristic of known potential targets on a best-match basis. In accordance with an alternative embodiment, a system is provided which can extract two-dimensional, high-resolution information from radar return signals in which the non-coherent pulse radar means is moved from one location to another with respect to a target area of interest while transmitting N-sequential signals of differing frequencies at predetermined time intervals. The radar receiver is positioned to detect and range gate composite radar return signal samples reflected from a plurality of point scatterers and once a time varying D.C. interference signal is detected, a two-dimensional Fourier transformation is performed on that composite signal.
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Coulter Thomas R.
Isaacson Philip O.
Thiede Edwin C.
Gregory Bernarr Earl
Haugen Orrin M.
Honeywell Inc.
Niebuhr Frederick W.
Nikolai Thomas J.
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