G - Physics – 01 – S
Patent
G - Physics
01
S
343/4, 88/0.13
G01S 17/00 (2006.01) G01S 13/90 (2006.01) G02B 5/28 (2006.01) G02B 27/46 (2006.01)
Patent
CA 1037306
An air-borne radar system for terrain-imaging employs a sidelooking synthetic-aperture radar that records reflected signals on photographic film. Range data has a constant focal length whereas data in an azimuth direction has a focal length that varies as a function of range and therefore requires opt- ical correction. A known processor system brings the various focal planes into coincidence using a complex lens structure that includes a computer generated spatial filter. A novel method and apparatus is disclosed for interferometrically gen- erating a two-dimensional spatial filter is more simple and economical to produce. Means are provides for diffracting a source beam of coherent light into a beam having a predeter- mined amplitude distribution. The resulting beam is imaged through a lens system onto a light responsive recording medium together with direct illumination from a reference source of coherent light to obtain a predetermined intensity distribution. The intensity of the exposing light is determined by both a magnification and a Fourier transformation of the diffracted beam. After development, the recording medium has an amplitude transmittance necessary for the desired spatial filter and may be used directly in the known processor system.
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