G - Physics – 01 – S
Patent
G - Physics
01
S
343/54, 324/29.8
G01S 1/36 (2006.01) G01N 22/00 (2006.01) G01S 13/90 (2006.01) G01V 3/17 (2006.01) H01Q 3/26 (2006.01) H01Q 25/00 (2006.01)
Patent
CA 2009423
APERTURE SYNTHESIZED RADIOMETER USING DIGITAL BEAMFORMING TECHNIQUES ABSTRACT A digital aperture synthesized radiometer (10) for synthesizing and imaging an scene. A plurality of antenna arrays (12) receive radiation emitted or reflected from an scene, and an analog to digital converter (16) converts received radiation into digitized signals. A digital beamformer (18) synthesizes the digitized signals to pro- vide an image corresponding to the scene. The digital beamformer (18) comprises individual digital beamformers which generate a set of fanbeam signals (13) for each array. The beamformers (18) provide for cross track imaging of the scene. A digital interferometer (20) correlates corresponding pairs of fanbeam signals (13) from the two sets of fanbeam signals to produce a chirp signal for each pair. A matched filter (22) processes the chirp signals to transform each chirp signal into a corresponding image point of the scene. This provides for along track imaging of the scene. The beamformers (18) include an amplitude weighting and data turning circuit (32) to re- duce fanbeam signal sidelobe levels and eliminate alternate mainlobes from the digi- tized radiation signals to reduce mainlobe widening. A fast Fourier transform circuit (34) in the beamformers (18) generally comprises a decimation-in-time algorithm im- plemented by means of a plurality of parallel and cascaded butterfly computation cir- cuits. Image processing methods for achieving digital radiometry are also disclosed.
Chang Donald C.d.
Kelley Edwin A.
Hughes Electronics Corporation
Sim & Mcburney
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