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提出了掺铒光纤放大器(EDFA)应用于激光雷达接收系统光学前置放大器以提高雷达探测性能和作用距离的方法。回波信号功率是影响雷达探测分辨率的因素,它随着探测距离的增大而减小。讨论了光电检测前放大回波信号的技术,结合激光雷达回波信号的特点对EFDA主要应用特性(增益特性、噪声特性)进行理论分析。建立了雷达信号传输模型,讨论了大气消光与大气湍流对回波信号的影响。将PIN-FET用作光电探测,给出了没有采用光放大和采用EDFA光学前置放大情况下的信噪比。数值模拟结果显示,将EDFA用作激光雷达接收机极大地提高了雷达系统的信噪比,探测距离越远探测性能的改善越明显。
An EDFA (EDFA) is proposed for the optical preamplifier of lidar receiving system to improve the performance and distance of radar detection. Echo signal power is the factor that affects the resolution of the radar detection, which decreases as the detection distance increases. The technique of amplifying the echo signals before photoelectric detection is discussed. The main application characteristics (gain characteristics and noise characteristics) of EFDA are analyzed theoretically with the characteristics of laser radar echo signals. The radar signal transmission model is established and the influence of atmospheric extinction and atmospheric turbulence on the echo signal is discussed. Using the PIN-FET as a photodetector gives the signal-to-noise ratio without optical amplification and with EDFA optical preamplification. Numerical simulation results show that using EDFA as a lidar receiver greatly improves the signal-noise ratio of the radar system. The more the detection range, the better the detection performance.