Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1988-08-17
1989-11-07
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342195, G01S 1390, G01S 744
Patent
active
048795593
ABSTRACT:
Synthetic aperture radar is a known system for producing a high resolution image of the terrain under a moving platform, in which the effect of a large antenna (which would give high resolution in the direction of travel (azimuth direction)) is synthesized by processing together with suitable phase shifts a large number of radar returns from a smaller antenna for which the footprints overlap.
In order to simplify the image processing task, which is preferably carried out at high speed and on the moving platform itself, according to the invention an azimuth processor comprises a plurality of data processing modules 35.sup.1 -35.sup.R/N, each associated with a different part of the (range line) samples of echo returns, for example, by virtue of being connected to successive sections 33.sup.1 -33.sup.R/N of a shift register into which successive range lines are clocked. Each module 35.sup.i includes a memory 39.sup.i to store the sets of range line samples, a processing section 37.sup.i to azimuth process the samples contained in the memory. To accommodate the range migration effect whereby the range of a point on the terrain varies between different echo returns as the platform moves relative to the terrain, adjacent modules are interconnected by links 49.sup.i so that samples required for processing by a module and not contained in its memory may be obtained from another module.
REFERENCES:
patent: 4045795 (1977-08-01), Fletcher et al.
patent: 4132989 (1979-01-01), Arens
patent: 4227194 (1980-10-01), Herman et al.
patent: 4471357 (1984-09-01), Wu et al.
patent: 4594593 (1986-06-01), Nohmi
Di Cenzo, A. "A New Look at Nonseperable Synthetic Aperture Radar Processing", IEEE Trans Aerospace and Elec. sys. vol. 24, No. 3, May 88, pp. 218-224.
Barron Jr. Gilberto
Tarcza Thomas H.
The General Electric Company p.l.c.
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