Frequency plane filters for an optical processor for synthetic a

Details Frequency plane filters for an optical processor for synthetic a Frequency plane filters for an optical processor for synthetic a

1977-03-07

1978-08-22

Corbin, John K.

350 382, G02B 518

Patent

active

041085388

ABSTRACT:
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 optical 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 generating a two-dimensional spatial filter which is more simple and economical to produce. Means are provided for diffracting a source beam of coherent light into a beam having a predetermined 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.

REFERENCES:
patent: 3640604 (1972-02-01), Yarnell
patent: 4071907 (1978-01-01), Casasent
Stark et al., "Optical Processing of Radar Signals . . .", Applied Optics, vol. 10, No. 12, Dec. 1971, pp. 2728-2733.
Kozma et al., "Tilted-Plane Optical Processor", Applied Optics, vol. 11, No. 8, Aug. 1972, pp. 1766-1777.
Lee et al., "Matched Filter Optical Processor", Applied Optics, vol. 13, No. 4, Apr. 1974, pp. 925-930.
Kock, "A Real-Time Parallel Optical Processing Technique", IEEE Trans. On Computers, vol. c-24, No. 4, Apr. 1975, pp. 407-411.

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