非相干探测模式下啁啾调幅关联成像影响因素研究

Influence of Chirped-Amplitude Correlated Imaging Under Incoherent Detection

啁啾调幅激光关联成像是一种将关联成像原理与脉冲压缩方法相结合的新型成像方法,能够获取目标的方位、灰度、距离和速度信息,并且可以有效抑制背景噪声对成像质量的影响。目前初步建立了啁啾调幅激光关联成像理论模型和仿真验证,然而并未涉及光源调制性能对成像质量的影响。为此理论推导并数值分析了背景光存在条件下,光源调制性能对非相干外差探测啁啾调幅关联成像质量的影响。并且得到了起始调制深度、调制深度衰减系数、频率改变率,以及光电探测器带宽等参数与探测信噪比及成像质量的关系,该工作对啁啾调幅激光关联成像雷达系统的设计和性能评估具有指导意义。

Chirped-amplitude-modulated（CAM）laser ghost imaging（GI）is a novel imaging mechanism that combines the principle of correlated imaging with pulse-compression.It can acquire the direction,grayscale,range and velocity of the target,and can effectively reduce the influence of the background noise on imaging quality.At present,the theoretical model and simulation verification of chirped-amplitude laser correlation imaging are preliminarily established.However,the influence of laser source modulation performance is not involved.For this reason,the influence of modulation performance on imaging quality of non-coherent heterodyne CAM GI is deduced and numerically analyzed.The relationships among initial modulation depth, modulation depth decay coefficient,frequency change ratio and bandwidth of photodiode on detection signal to noise ratio and imaging performance of heterodyne GI are obtained.This work has guiding significance for the future design and performance assessment of CAM GI lidar system.