Speckle Reduction In Microwave Imaging By The CLEAN Technique

Jenho Tsao; Bernard D. Steinberg

doi:10.1117/12.949542

25 November 1985 Speckle Reduction In Microwave Imaging By The CLEAN Technique

Jenho Tsao, Bernard D. Steinberg

Proceedings Volume 0556, Intl Conf on Speckle; (1985) https://doi.org/10.1117/12.949542
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

The CLEAN technique was introduced in radio astronomy in the last decade to reduce sidelobe-induced artifacts. It was designed to operate on noncoherent radiation fields. This paper extends CLEAN to the coherent radiation field as found in microwave radar, acoustic sonar and ultrasonic scanning. In addition to sidelobe-artifact suppression, the method reduces speckle-induced artifacts. CLEAN coherently decomposes the radiation field of a complex target into signals from individual scattering centers. This signal decomposition permits the elimination of the constructive (sidelobe) and destructive (speckle) interference, resulting in increased target dynamic range and reduction of the mottled effect in extended targets. The experimental high resolution microwave imagery obtained from a Valley Forge Research Center imaging radar (20 m long, 3 cm wavelength) demonstrates the strength of the technique.

Citation Download Citation

Jenho Tsao and Bernard D. Steinberg "Speckle Reduction In Microwave Imaging By The CLEAN Technique", Proc. SPIE 0556, Intl Conf on Speckle, (25 November 1985); https://doi.org/10.1117/12.949542

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