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傅里叶望远术(FT)是一种主要针对远距离暗弱目标的高分辨率光学干涉成像技术。它利用多束空间距离不同、时间频率受调制的激光干涉照明目标,通过解调光强探测器接受反射的回波时序信号来提取目标的傅里叶频谱,并利用相位闭合技术消除光程差和大气湍流等造成的相位畸变。采用发散光干涉在实验室内实现了傅里叶望远术对一维和二维目标的重构。实验方案较好地模拟了外场“T”型阵列发射结构,同时还保证了光斑的有效重合,最大程度地利用了光斑能量,有利于提高信号的信噪比,有利于光束对目标的瞄准,对进一步避免大气湍流的影响具有一定指导意义。
Fourier telephotography (FT) is a high-resolution optical interference imaging technique that is mainly aimed at long-range dim targets. The invention utilizes the multi-beam laser interference illumination target with different spatial distances and time-frequency modulation, extracts the target Fourier spectrum by demodulating the intensity detector and receives the reflected echo sequence signal, and uses the phase closing technique to eliminate the optical path difference And atmospheric turbulence caused by the phase distortion. The divergent light interference was used to reconstruct the one-dimensional and two-dimensional targets in Fourier telescope in the laboratory. The experimental scheme simulates the structure of the “T ” array in the outfield well, and ensures the effective overlap of the light spots, maximizes the energy of the light spot, improves the signal-to-noise ratio of the signal and facilitates the beam to the target Targeting, to further avoid the impact of atmospheric turbulence has some guiding significance.