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Noise Mechanisms Impacting Micro-Doppler Lidar Signals: Theory and Experiment

机译：影响微多普勒激光雷达信号的噪声机制：理论与实验

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摘要

Lidar remote sensing of micro-Doppler signals is important for many military applications including characterization and identification of ground and airborne targets (NCTID) and battle damage assessment. The single most important performance metric of these sensors is their velocity measurement precision. The velocity precision of a micro-Doppler lidar is limited by any one of various noise sources, which include shot-noise, local-oscillator frequency noise, speckle decorrelation noise and refractive turbulence piston noise. In this paper, we present a theory, which describes these noise sources and their wavelength dependence. For example, it will be shown that the turbulence piston noise is wavelength independent, while the wavelength dependence of speckle decorrelation noise depends upon whether or not the target is resolved. Furthermore, the noise sources are, to a first-order, independent of the interrogation waveform classification (i.e., pulsed or CW). The results from recent field measurements using a doublet- pulse and CW lidar are presented.

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