三维成像激光雷达高带宽数据采集与存储系统  

High-Band width Data Acquisition and Storage System for Three-Dimensional Imaging Lidar

作　　者：吕卫 王粟瑶 Lii Wei;Wang Suyao(School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China)

机构地区：[1]天津大学电气自动化与信息工程学院

出　　处：《激光与光电子学进展》2019年第10期251-260,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61271069);国家海洋实验室2016开放基金(QNLM2016OPR0411)

摘　　要：设计了三维成像激光雷达高带宽数据采集与存储系统。为保证系统存储的实时性,通过PCIE 3.0(peripheral component interface express 3.0)将数据传输到计算机,将回波数据存储到固态硬盘(SSD)大容量盘阵中。针对系统中多片模数转换器(ADCs)采样数据不同步问题,提出了高速信号同步触发电路及现场可编程逻辑门阵列(FPGA)固有路径延迟校准算法。为了精确测量激光雷达内光路触发脉冲与系统时钟之间的延时量,设计了基于多级输入输出延迟(IODELAY)单元的时间数字计数器(TDC)算法,时间分辨率高达52ps。结果表明,系统最大存储带宽为5.12GByte/s,存储容量为24TByte,在数据采集和存储上表现出很强的实时性和同步性,有较高的实用价值。This paper presents the design of a high-bandwidth data acquisition and storage system for 3D imaging lidar. To ensure the real-time storage for the system, the data are transmitted to the computer via PCIE 3. 0 (peripheral component interface express 3. 0), and the echo data are stored in a solid-state drive (SSD) largecapacity disk array. A high-speed signal synchronization trigger circuit and the field-programmable gate array (FPGA) inherent path-delay calibration algorithm are proposed to address the problem that the sampling data of the multiple analog-digital converters ( ADCs) in the system are not synchronized. To accurately measure the delay between the laser path trigger pulse and the system clock, a multi-level input-output delay (IODELAY) unit time digital counter (TDC) algorithm is designed with a time resolution of up to 52 ps. The results show that the system has been verified to have a maximum storage bandwidth and capacity of 5 . 12 GByte/s and 24 TByte, respectively. Further, the system exhibits a strong real-time and synchronization performance for data acquisition and storage and has a high practical applicability.

关 键 词：遥感 三维成像激光雷达 回波信号 高速数据采集 数据存储 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]