Bin Chen 1,2,3Jinbao Long 1,2,3Hongtai Xie 1,2,3Chenyang Li 1,2,3[ ... ]Shuai Chen 1,2,3,*
Author Affiliations
Abstract
1 Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
2 Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
3 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
The gravimeter based on atom interferometry has potential wide applications on building gravity networks and geophysics as well as gravity assisted navigation. Here, we demonstrate experimentally a portable atomic gravimeter operating in the noisy urban environment. Despite the influence of noisy external vibrations, our portable atomic gravimeter reaches a sensitivity as good as and a resolution of 1.1 μGal after 4000 s integration, being comparable to state-of-the-art atomic gravimeters. Our achievement paves the way for bringing the portable atomic gravimeter to field applications.
atomic gravimeter noisy environment Chinese Optics Letters
2020, 18(9): 090201
大连大学辽宁省北斗高精度位置服务技术工程实验室, 辽宁 大连 116622
针对噪声影响下光流计算稳健性较差及收敛速度慢的问题, 提出一种噪声环境下光流场快速稳健估计方法。所提算法基于噪声环境下光流场估计方法, 引入惩罚因子以增强光流计算稳健性, 并在光流计算迭代公式中加入动量因子缩短光流计算收敛时间以加快光流场计算。而后基于变分方法极小化光流能量函数求解欧拉-拉格朗日方程, 最后通过迭代方法求得速度场。仿真结果表明, 对视频中连续两帧图片加入不同高斯噪声后, 与M算法及ML算法相比, 所提算法可显著增强光流场计算稳健性, 缩短光流计算收敛时间, 加快光流场计算。
光流计算 噪声环境 惩罚因子 动量因子 收敛速度 稳健性 optical flow calculation noisy environment penalty factor momentum factor convergence speed robustness
