基于APD阵列三维成像激光雷达信噪比分析

基于雪崩光电二极管APD阵列的三维成像激光雷达采用激光单脉冲直接获取三维图像。为了仿真评估系统的性能,主要分析了APD阵列增益对系统信噪比和探测概率的影响,APD阵列的阈值电压对系统探测概率的影响。仿真结果表明,当选取合适的APD阵列增益时,系统的信噪比和探测概率可以达到最大值;APD阵列阈值电压的增大会降低系统的探测概率,并且对系统的探测概率影响很大。

盖革模式APD阵列激光雷达的三维成像仿真

基于盖革模式APD阵列激光雷达是一种非扫描三维成像激光雷达,为研究系统的三维成像效果,对该系统的三维图像进行仿真。首先应用光线追踪法构建三维场景;并对APD像元的探测概率和累积概率进行仿真,在此基础上给出对探测距离仿真的方法,得到激光雷达探测的距离像;最后通过坐标变换将距离像转化为三维图像,实现了三维场景重建。仿真结果表明,该方法能较好地仿真出激光雷达获得的场景三维图像,并可以为APD阵列激光雷达的研究提供仿真试验数据。

空间交会对接激光雷达关键技术分析

结合美国AOS公司的AVGS和WA-LRF,美国Sandia国家实验室的LDRI及加拿大Neptec公司的TriDAR三个实用系统,详细分析了国外空间交会对接激光雷达关键技术及其相应算法,对比指出不同系统的优缺点。在此基础上提出了采用基于APD阵列的三维成像激光雷达用于空间交会对接,为发展空间技术提供参考。

Recognizing cat-eye targets with dual criterions of shape and modulation frequency

We present an image recognition method to distinguish targets with cat-eye effect from the dynamic background based on target shape and modulation frequency. Original image sequences to be processed are acquired through an imaging mechanism that utilizes a pulsed laser as active illuminator and an industrial camera as detection device. There are two criterions to recognize a target： one exploits shape priors and the other is the active illuminator＇s modulation frequency. The feasibility of the proposed method and its superiority over the single criterion method have been demonstrated by practical experiments.