Communications: directive radio wave systems and devices (e.g. – Directive – Including a radiometer
Patent
1987-02-12
1988-02-09
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a radiometer
342372, 342375, 342400, G01S 302
Patent
active
047244399
ABSTRACT:
A microwave radiometer reconstructs images by fanbeam inversion. True time delay (100), frequency (600, 700) and mechanical scanning systems (200) are disclosed. The mechanically scanning radiometer includes a fanbeam antenna (210) to scan a scene so that the antenna output is a projection of the scene taken along the direction of scan. The mechanical scanning motion is provided by a rocking motor (254) controlled by a computer (214). Projections are obtained for successive orientations as the antenna is rotated by another motor (212). By application of an inverse Radon transform, the scene scanned is reconstructed by the computer.
In one frequency scanning system (600), a filter bank spectrometer is implemented to obtain the projections, and in the other frequency scanning system (700), a transform spectrometer implemented. In the delay scanning system (100), a beam forming computer is used in the reconstruction process. A modification of the Radon transform is disclosed which compensates for the conicity of electronically scanning fanbeams.
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Edelsohn Charles R.
Wiley Carl A.
Blum Theodore M.
Cain David
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
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