一种新型的随机位相编码幅值调节联合变换相关器

Study of a novel phase-encoded amplitude-modulated joint transform correlator

提出了基于位相编码幅值调节技术的光学联合变换相关器,得到锐化的相关输出结果,具有很好的抗噪声干扰性能.首先通过位相模板对输入的待识别目标进行位相编码,然后对联合功率谱进行幅值调节滤波.根据目标的噪声干扰情况改变增强型滤波器的调节因子,使相关器输出锐化的相关信号.位相编码幅值调节技术可有效去除冗余信号,特别适用于对受噪声干扰的多目标进行识别.同时给出了位相编码幅值调节联合变换相关器的光电混合结构和计算机模拟运算结果.

A novel phase-encoded and amplitude-modulated technique applied to a classical joint transform correlator (JTC) is proposed, which yields superior output correlation signals and better noise robustness than a classical JTC. In the proposed phase-encoded amplitude-modulated JTC (PAJTC) technique, firstly, the input targets are encoded by an application of a phase mask, and then the joint power spectrum (JPS) is multiplied by an amplitude modulated filter (AMF) of the reference object before the inverse Fourier transform. An enhanced amplitude-modulated filter, in which the value of modulation factor varies according to the noise present in the input scene, is used in the PAJTC technique. The PAJTC technique eliminates extraneous signals especially for the JTC with multiple input targets. An optoelectronic implementation schematic diagram for the PAJTC technique and computer simulations of the performances of the classical JTC and the PAJTC for comparison are also given.