红外与激光工程, 2015, 44 (4): 1208, 网络出版: 2016-01-26
资源有限FPGA的多通道时间-数字转换系统
Resources-limited FPGA based-multi-channel TDC system
激光三维成像雷达 时间-数字转换系统 空间应用 资源有限 三模冗余 3D imaging laser radar TDC system space applications resources-limited triple modular redundancy
摘要
基于Xilinx XC2V3000芯片设计了一种应用于星载多通道快速激光三维成像雷达中的抗辐照增强型时间-数字转换(Time-to-Digital Converter, TDC)系统。单板2片FPGA内实现了16通道高精度时间间隔测量。采用了多延时链冗余结构,每个测时通道由3个物理测时链路组成,最后通过三模冗余增强抗单粒子翻转能力。并应用了通道均匀性校准修正技术,解决了多通道测时均匀性问题。实验结果表明,系统测时精度达到62.9 ps,通道一致性较好,满足激光雷达三维成像要求,同时该技术方案具有低功耗、轻量化等特点。
Abstract
Based on Xilinx XC2V3000 chip, a multi-channel irradiation resistance enhanced (Time-to-Digital Converter, TDC) system was designed. 16-channel high-precision time measurement was achieved within 2 FPGAs in a single board. With multi-redundant delay-chain structure, each measuring channel consisting of three physical timing links, and the anti-SEU ability was enhanced by triple modular redundancy. The channel uniformity calibration correction technology was applied to solve the multi-channel uniformity issues. Experimental results prove that the system meets the requirements of a 3D imaging laser radar, with an accuracy of 62.9 ps and a good uniformity. Meanwhile, the technical solution provides has a character of low power consumption, light weight etc.
吴军, 王海伟, 郭颖, 洪光烈, 何志平, 徐卫明, 舒嵘. 资源有限FPGA的多通道时间-数字转换系统[J]. 红外与激光工程, 2015, 44(4): 1208. Wu Jun, Wang Haiwei, Guo Ying, Hong Guanglie, He Zhiping, Xu Weiming, Shu Rong. Resources-limited FPGA based-multi-channel TDC system[J]. Infrared and Laser Engineering, 2015, 44(4): 1208.