中国人民解放军战略支援部队信息工程大学地理空间信息学院，河南 郑州 450001
针对当前光学智能遥感卫星有限存储能力对全球控制信息的轻量化需求，提出一种面向光学遥感卫星星上定位精度优化的轻量化矢量控制库技术。首先，在地面提取完整道路网，通过道路细化、节点提取以及拓扑关系构建等处理，生成星上轻量化矢量控制库并上注卫星；其次，星上在轨提取道路结构，并利用随机游走避免道路缺失的影响，生成随机游走矢量结构；然后，引入隐马尔科夫模型，搜索对应矢量，并设计分层匹配策略以精化匹配结果，实现星上轻量化矢量控制库与随机游走矢量结构的匹配；最后，利用不同类型卫星影像进行随机游走矢量结构提取、星上矢量匹配以及定位性能分析。结果表明，所提光学遥感卫星的星上轻量化矢量控制库能够有效改善非量测光学遥感卫星定位精度，验证了其在光学智能遥感卫星中的可行性。
轻量化处理 矢量控制库 星上智能处理 矢量匹配 高分辨率光学遥感卫星
中国人民解放军战略支援部队信息工程大学地理空间信息学院，河南 郑州 450000
结合图论思想，提出一种高效的异源影像点云配准方法。该方法首先利用点云几何特征寻找点云中的地平面方向，将点云中建筑物的布局关系构建成图形式，使点云配准问题转化为图匹配问题；然后，提出一种图匹配方法，基于几何约束条件构建核三角形作为配准基元，利用高阶相似度信息寻找图的全局最优匹配，实现点云间的快速、稳健初配准；最后，结合迭代最近点（ICP）算法进行精配准，获得高精度异源点云配准结果。为了验证所提方法的有效性，选取河南省3个不同区域的高分七号卫星影像点云和无人机近景影像点云进行实验。实验结果表明，所提方法不受噪声点和异常值的影响，能够克服不同的点云密度差异、消除约939倍的坐标尺度差异，整体配准速度相较于对比方法提升了51~184倍，全自动地实现了异源影像点云鲁棒、高效配准。
遥感 影像点云 点云配准 图论 高分七号卫星 光学学报
2023, 43(12): 1228006
中国科学技术大学中国科学院量子信息重点实验室，安徽 合肥 230026
金刚石中的氮-空位（NV）色心在室温下具有稳定的荧光发射，超长的电子自旋相干时间以及许多优良的光学性质，可以对电磁场，温度进行高灵敏度表征。光纤传感技术近几年来发展迅速，在电力、化工、交通、医疗、环保及**等领域得到广泛应用。光纤体系由于其集成度、实用性高以及操作便捷性，且具有优良的传输光能力，损耗较低，可与NV色心结合，形成一种高集成化、高灵敏度的便捷性传感系统，未来将会作为传感器件投入到许多领域的应用中，例如对生物细胞、材料温度、磁场等物理量的高灵敏度测量。本综述主要介绍NV色心体系的光纤量子传感技术的工作原理、实现方式以及在相关领域的应用。
氮-空位色心 光纤 量子传感 激光与光电子学进展
2023, 60(11): 1106001
Haobin Lin 1,2,3Ce Feng 1,2,3Yang Dong 1,2,3Wang Jiang 1,2,3[ ... ]Fangwen Sun 1,2,3
Author Affiliations
Abstract
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
4 National Key Laboratory of ASIC, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
Nitrogen-vacancy color centers can perform highly sensitive and spatially resolved quantum measurements of physical quantities such as magnetic field, temperature, and pressure. Meanwhile, sensing so many variables at the same time often introduces additional noise, causing a reduced accuracy. Here, a dual-microwave time-division multiplexing protocol is used in conjunction with a lock-in amplifier in order to decouple temperature from the magnetic field and vice versa. In this protocol, dual-frequency driving and frequency modulation are used to measure the magnetic and temperature field simultaneously in real time. The sensitivity of our system is about and , respectively. Our detection protocol not only enables multifunctional quantum sensing, but also extends more practical applications.
quantum sensing temperature measurement magnetic field measurement Chinese Optics Letters
2023, 21(1): 011201
Author Affiliations
Abstract
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Hefei National Laboratory for Physical Science at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China
The nitrogen vacancy (NV) center in diamond has been well applied in quantum sensing of electromagnetic field and temperature, where the sensitivity can be enhanced by the number of NV centers. Here, we used electron beam irradiation to increase the generation rate of NV centers by nearly 22 times. We systematically studied the optical and electronic properties of the NV center as a function of an electron irradiation dose, where the detection sensitivity of magnetic fields was improved. With such samples with dense NV centers, a sub-pico-Tesla sensitivity in magnetic fields detection can be achieved with optimal controls and detections.
quantum sensing nitrogen vacancy center generation electron irradiation Chinese Optics Letters
2020, 18(8): 080201
