介绍激光指令制导和激光驾束制导的大视场激光接收机的设计原理,给出接收光场的数学模型,由斜入射平行光的衍射光场推出探测光学系统的视场角公式,根据1 064 nm大视场激光接收机技术要求,以聚光物镜型探测光学系统为例,探讨接收光学系统既须具备特大相对孔径,又须具备无晕接收性能的设计特点,采用窄带干涉滤光镜进行光学滤波降噪.给出一种适用于高重频(200 kHz)工作的低噪声放大器的设计实例,介绍了低噪声放大电路的设计原理.测试结果表明:设计的大视场激光接收机的接收视场角≥±10°,、动态范围≥40 dB,当放大器输出信号信噪比等于4时接收灵敏度Pmin=5.38×105 W.%The design principle of the laser receiver with wide FOV for the laser command guidance and laser-beam riding guidance is introduced. A mathematic model of receiving light field is presented. The formula for the viewing angle of the detecting optical system was derived according to the diffraction light field of the oblique incidence parallel light. Taking a detecting optical system with the collecting objective for example, the design characteristic that the receiving optical system needs not only an extra large relative aperture but also an unvignetting receiving performance is discussed on the premise of meeting the requirement of 1 064 nm WFOV laser receiver. A narrow band interference filter was adopted to realize the noise reduction. A design example of a low noise amplifier suitable to the high-repetition-rate (200 kHz) is given. The design principle of the low noise amplification circuit is introduced. The tested results of receiving FOV angle, dynamic range and receiving sensitivity of the laser receiver with wide FOV are provided.
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