中国激光, 2006, 33 (suppl): 361, 网络出版: 2006-04-21  

激光测高系统中飞行时间皮秒级精度的实现

Time of Flight Measurements with Picoseconds Resolution in Laser Altimetry
作者单位
中国科学院安徽光学精密机械研究所, 安徽 合肥 230031
摘要
激光测高仪通过测量激光脉冲的飞行时间来获得测高仪与探测目标之间的距离,因此激光飞行时间测量的准确性是衡量其系统能力的根本指标。提出以延迟锁相环(DLL)配合双延时线矩阵结构,再结合计数器的全数字方法来实现飞行时间的精密测量,测量结构在单片可编程门阵列(FPGA)中实现,其测距精度可达250 ps,-10 ℃~+50 ℃范围内延时线漂移不超过±30 ps。同时也对激光发射和接收电路作做了具体讨论,可有力地提高飞行时间的测量精度。该测高系统成型后,由于电路集成度高,功耗小,重量轻,系统稳定性强,达到激光测高要求。
Abstract
A pulsed time-of-flight laser radar operates by transmitting a short laser pulse to an optical visible target and detecting the reflected pulse by an optical detector. The measured distance is calculated from this flight time. So the accuracy of laser time interval is a basic beacon to measure its system capability. By using two tapped differential delay lines working in a matrix mode with delay locked loop (DLL), to gether with counter, high precision measurement in flight time is realized in an entire digital way with all measurement construction located in a single field programmable gate array (FPGA). The single-shot precision of the time digital converter (TDC) is better than 250 ps, the drifts of TDC units remain within±30 ps over a temperature range -10~+50 ℃. The concrete design of transmit and receive circuits is discussed to improve the accuracy of the TDC. Because of the high integration, low power, light weight and stable performance the prototype reaches the request of the laser altimeter.

赵欣, 李季, 陈结祥, 赵平建, 戚俊, 涂碧海. 激光测高系统中飞行时间皮秒级精度的实现[J]. 中国激光, 2006, 33(suppl): 361. 赵欣, 李季, 陈结祥, 赵平建, 戚俊, 涂碧海. Time of Flight Measurements with Picoseconds Resolution in Laser Altimetry[J]. Chinese Journal of Lasers, 2006, 33(suppl): 361.

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