弹载共孔径激光微多普勒目标识别系统研究

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。

Research on missile-borne common aperture laser micro-Doppler target recognition system

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.