Experimental investigation of transform ratio ternary phase-amplitude filters for improved correlation discrimination

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Abstract
Transform ratio ternary phase-amplitude filters (TR-TPAFs) encoding the modulation states 1, 0, — 1 have been investigated in theory and practice. Simulations have demonstrated that TR-TPAFs can be formulated to provide increased discrimination compared with binary phase-only filters. TPAFs have practical advantages over complex-valued matched filters—efficient electronic filter storage and real-time implementation with available devices, such as magneto-optic spatial light modulators (MOSLMs).These are associated with the use of only three discrete modulation levels. In an experimental study, significant increases in correlation discrimination were demonstrated for several test patterns, showing substantial agreement with computer simulations. The effects of an imperfect MOSLM zero-modulation state, present in our experiment, were modeled and investigated. The performance of the TR-TPAFs for different threshold line angles also was investigated.

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