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提供了利用外差检波的10.6微米激光雷达的参数研究。取得了在达8公里范围内的各种非合作目标的返回。为避免零差操作,雷达装置采用了补偿本机振荡频率。对1.06公里范围内的信噪比的测量表明,系统处于4倍的量子极限范围内操作。对305米到120公里范围内的能见度,发现散射系数的变化范围从1.05×10~(-8)米~(-1)到4.21×10~(-7)米~(-1)。发现目标的返回的去偏振作用小于20而大气气悬体的则接近于O。研究了大气和目标的闪烁现象,结果是目标引起的闪烁一般较大,而大气的闪烁比可见的激光波长更小。最后叙述了由扫描器所引起的频率加宽的测量,与有扫描镜的多普勒位移的简易理论模式取得良好的一致。
A parametric study of 10.6 μm lidar using heterodyne detection is provided. The return of various non-cooperative targets within a range of up to 8 kilometers has been achieved. In order to avoid homodyne operation, the radar device compensates for the local oscillation frequency. Measurement of the signal-to-noise ratio in the range of 1.06 km indicates that the system is operating at quadruple quantum limits. For the visibility in the range of 305-120 km, the scattering coefficient was found to range from 1.05 × 10 -8 to -1.4 × 10 -7 m -1. The depolarization of the target is found to be less than 20 and that of the aerosols close to zero. The flickering phenomenon of the atmosphere and the target is studied, with the result that the flicker caused by the target is generally larger and the flicker of the atmosphere is smaller than that of the visible laser light. Finally, the measurement of broadening of the frequency caused by the scanner is described, which is in good agreement with the simple theoretical model of the Doppler shift of the scanning mirror.