【摘要】 根据无扫描成像激光雷达光电阴极输出光电子计数分布满足泊松统计的特点,由极大似然估计方法,给出判定是否接收到回波的似然比判据阈值的计算方法。并针对典型无扫描距离选通成像激光雷达情况,给出了系统探测概率、虚警概率和漏警概率的近似计算方法,并采用蒙特-卡罗模拟方法进行验证。分析了系统阈值对探测概率的影响,并提出变阈值的方法提高探测系统探测概率。而受系统硬件的限制,在满足探测要求的情况下,尽量缩短探测距离和减少探测器像素数,增加接收目标的有用信号光子数,并同时根据极大似然估计法来确定阈值,达到提高探测概率的目的。更多还原

【Abstract】 The converted number of photoelectrons after the photocathode of scannerless imaging lidar meet the Poisson statistical distribution.The calculation for judging threshold of lidar system is proposed according to maximum likelihood estimation.Taking a typical scannerless range-gated imaging lidar as the case,an approach to approximately calculate detection probability,false-alarm probability and dropouts probability is presented which is proved by Monte-Carlo simulation.The effect of system threshold on detection probability is analyzed.A proposal that increases the detection probabilities when threshold changes with signal and noise is raised.Under the hardware limitation of lidar system,as the detection requests are satisfied,reducing the detection range and number of detector pixels mostly,increasing arrived signal photons from the target,determining the threshold by maximum likelihood estimotion,the detection probability of the system is improved.更多还原