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6 December 1988 A Novel Guided-Wave Correlator For Real-Time Synthetic Aperture Radar Data Processing
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Proceedings Volume 0993, Integrated Optical Circuit Engineering VI; (1988) https://doi.org/10.1117/12.960093
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States
Abstract
In this paper the design of a novel guided-wave correlator for air-bone synthetic aperture radar (SAR) data processing is illustrated. Correlation in azimuth direction is carried out through an optical transmission mask which includes the azimuth reference signal, and a two-dimensional CCD array working in time delay integration mode. The guided-wave correlator proposed in this paper performs the correlation in ground range direction operating in time integration mode. The device utilizes an optical waveguide formed in z-cut LiNb03 by proton exchange in dilute benzoic acid. The waveguide supports a collimation lens, a surface acoustic wave Bragg deflector and a grating filter which allows to remove the undiffracted beam. This new filtering technique does not require fabrication of lenses performing spatial Fourier transform. Moreover, usual procedures of planar technology can be followed to fabricate the correlator. When a laser beam at X = 0.84 pm is intensity modulated by the reference chirp signal having a bandwidth of 50 MHz, a correlation signal referred to the reference signal carrier is obtained. In this way the separation of the real and imaginary parts of the output signal can be carried out leading to an easy digital post-processing. Small size, light weight and low power consumption are further advatanges of the new correlator. Finally, a range swath of 1 Km with a resolution cell of 3m x 3m is easily achieved for an air-bone SAR data processor.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mario N. Armenise, Evangelista Pansini, and A. Fioretti "A Novel Guided-Wave Correlator For Real-Time Synthetic Aperture Radar Data Processing", Proc. SPIE 0993, Integrated Optical Circuit Engineering VI, (6 December 1988); https://doi.org/10.1117/12.960093
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