Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1986-03-21
1988-02-02
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342179, 342196, G01S 1390
Patent
active
047231246
ABSTRACT:
Capability is provided using coherent synthetic aperture radar (SAR) techniques for substantially extending the useful range for producing 3 scaled high resolution orthogonal image projections on a CRT of a translating ship under the influence of rotational motions arising from sea state conditions, for the purpose of ship classification and weapon delivery from an airborne platform at long stand-off ranges. This advantage is brought about by determining image coordinates on the basis of range, doppler, and doppler rate measurements of individual scatterers and from ship angular rotational velocities derived from a weighted multivariate regression solution to doppler processed interferometric azimuth and elevation angle measurements of all significant ship target scatterers. In this manner, the image degradation suffered by plotting angular measurements directly, whose location accuracies are known to deteriorate rapidly with increased range due to high signal-to-noise requirements, is circumvented.
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Gregory Bernarr Earl
Grumman Aerospace Corporation
Tubbesing T. H.
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