Belmonte Aniceto
Department of Signal Theory and Communications, Technical University of Catalonia, BarcelonaTech, 08034 Barcelona, Spain.
Appl Opt. 2010 Dec 10;49(35):6737-48. doi: 10.1364/AO.49.006737.
A statistical model for the return signal in a coherent lidar is derived from the fundamental principles of atmospheric scattering and turbulent propagation. The model results in a three-parameter probability distribution for the coherent signal-to-noise ratio in the presence of atmospheric turbulence and affected by target speckle. We consider the effects of amplitude and phase fluctuations, in addition to local oscillator shot noise, for both passive receivers and those employing active modal compensation of wavefront phase distortion. We obtain exact expressions for statistical moments for lidar fading and evaluate the impact of various parameters, including the ratio of receiver aperture diameter to the wavefront coherence diameter, the speckle effective area, and the number of modes compensated.
基于大气散射和湍流传播的基本原理，推导了相干激光雷达中回波信号的统计模型。该模型得出了在存在大气湍流并受目标散斑影响的情况下，相干信噪比的三参数概率分布。对于无源接收器以及采用波前相位畸变有源模态补偿的接收器，我们考虑了幅度和相位波动的影响，以及本地振荡器散粒噪声的影响。我们获得了激光雷达衰落统计矩的精确表达式，并评估了各种参数的影响，包括接收器孔径直径与波前相干直径之比、散斑有效面积以及补偿的模式数量。
