为实现对距离4 km目标100 Hz振动特征的提取,提出利用激光微多普勒手段增强导弹目标辨识能力的方法.设计了一种基于偏振分光的激光发射/接收/电视共孔径系统,这种能够二级稳定的系统适应于弹载环境,利用光纤选通完成光程自动补偿,实现相干光匹配,采用本振/回波信号相干法,用线宽300 Hz的本振光调制后形成探测脉冲光,可提高探测距离,并避免回波与本振光因大气衰减而导致的错峰,由FPGA/DSP构建的傅里叶变换电路可获取时频曲线信号,频移为36 kHz时可实现目标的辨识.%In order to realize the extraction of vibration features at 100 Hz from a distance of 4 km,a method of using laser micro-Doppler to enhance the capacity of missile target identification was proposed,and a laser transmitting/receiving/video common aperture system based on polarization splitting was designed.This compact two-stage stable system is adapted to the missile-borne environment,and the optical path is compensated automatically by optical fiber selection,the coherent light matching can be realized.Using the coherence method of local oscillator/echo signal,the detection pulse light is formed by the modulation of local oscillator light with a line width of 300 Hz,so the detection range can be improved,also the false peak caused by the attenuation of atmosphere can be avoided.The Fourier transform circuit constructed by FPGA/DSP can obtain the time-frequency curve signal,the identification of the target can be achieved when the frequency is 36 kHz.
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