Communications: directive radio wave systems and devices (e.g. – Directive – Including a radiometer
Patent
1984-09-17
1987-03-31
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a radiometer
324 77C, 342375, G01S 302
Patent
active
046546669
ABSTRACT:
A passive imaging system (400) includes a frequency scanning array (412) for receiving radiation emissions from a scene with a flat or known spectrum of emissions over the operating frequency of the array. Different beam directions are addressed by a spectrum analyzer (404). An image coordinate generator (410) may be used where necessary to normalize the image which may be stored or displayed by an appropriate device (406).
In one embodiment, the array is planar so as to generate pencil beams. The planar array comprises parallel line-source antenna elements (402), with a common feed (414). The feed has a large "wrap-up" so that frequency-frequency scanning is employed.
Alternatively, one-dimensional images can be effected with a single line-source frequency scanning antenna element. Also, one-dimensional frequency scanning may be supplemented by a different scanning approach for resolution orthogonal to that provided by the frequency scanning. In one embodiment, phase gradient scanning is employed.
REFERENCES:
patent: 3438035 (1969-04-01), Fling et al.
patent: 3646559 (1972-02-01), Wiley
patent: 3743942 (1973-07-01), Carpenter
patent: 3808596 (1974-04-01), Kazel
patent: 4484356 (1984-11-01), Geesen et al.
Blum Theodore M.
Cain D.
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
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