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介绍了一种新型被动综合孔径成像探测方法:视场辐射信号被接收和放大后,通过电光幅度调制将其幅度和相位信息加载到光波上,经光纤传输在末端形成阵列,通过光学系统直接成像,将视场实时恢复出来。该方法可实现工作在微波、毫米波和太赫兹波段的高分辨力实时成像探测的目的。深入分析了电光调制器在综合孔径成像探测中的应用,建立电光调制模型,讨论了在小信号调制下的电光幅度调制近似理论。通过数值计算与仿真分析,得到综合孔径成像探测中电光调制器的调制信号强度限制的有关结论。结果表明,利用上变频电光调制技术和光信息处理,所得到的成像仿真图的半峰全宽和信噪比性能都优于传统的基于下变频技术的成像仿真结果。
A new passive synthetic aperture imaging detection method is introduced. After the field radiation signal is received and amplified, its amplitude and phase information is loaded onto the light wave by electro-optical amplitude modulation, and the array is formed at the end by optical fiber transmission and directly imaged by the optical system , The field of view will be restored in real time. The method can achieve the purpose of high-resolution real-time imaging exploration in microwave, millimeter wave and terahertz bands. The application of electro-optic modulator in comprehensive aperture imaging is deeply analyzed. The electro-optic modulation model is established and the approximate theory of electro-optical amplitude modulation under small signal modulation is discussed. Through the numerical calculation and simulation analysis, the conclusion of modulation signal intensity limit of electro-optic modulator in synthetic aperture imaging is obtained. The results show that the FWHM and SNR performance of the simulation images obtained by the up-conversion electro-optic modulation and optical information processing are better than the traditional imaging simulation results based on the down-conversion technique.