Apparatus and method for producing three-dimensional images

Details Apparatus and method for producing three-dimensional images Apparatus and method for producing three-dimensional images

1993-09-30

1995-02-28

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

G01S 1390

Patent

active

053941519

ABSTRACT:
An apparatus and method is capable of acquiring useful three-dimensional ar images from an aircraft which travels in a curvilinear path to generate only a sparsely filled synthetic array. A motion measurement unit outputs position measurements as the aircraft travels in the curvilinear path. The system includes a motion compensation and timing unit and a wave transmitter which outputs chirped radar signals. An antenna coupled to the wave generator sends the chirped radar signals to a region to be imaged and receives scattered chirped radar return signals from scatterers in the region. These scattered signals are coherently mixed to baseband and digitized before being input to a processor. The processor includes a range processing unit, a memory unit and an estimator. The range processor receives and Fourier transforms the digitized return signals to obtain range profiles. The estimator completes the image formation process by three-dimensional back projection of the range profiles. It also estimates the location and complex strengths of scatterers and uses these to generate a side lobe free image.

REFERENCES:
patent: 4847624 (1989-07-01), Hopwood et al.
patent: 4975704 (1990-12-01), Gabriel et al.
patent: 5053778 (1991-10-01), Imhoff
patent: 5260708 (1993-11-01), Auterman

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