Purpose A high-performance tracking system will be crucial for the realization of the full physics potential of the Circular Electron Positron Collider(CEPC)project.Abaseline tracker has been proposed in the Conceptua...Purpose A high-performance tracking system will be crucial for the realization of the full physics potential of the Circular Electron Positron Collider(CEPC)project.Abaseline tracker has been proposed in the Conceptual Design Report and requires detailed studies of the layout geometry and comprehensive understanding of its tracking performance.Methods A Common Tracking Software(ACTS)is an experiment-independent software package and introduced for the track reconstruction for particle and nuclear physics experiments.The CEPC baseline tracker geometry has been implemented in ACTS,and its tracking performance has been evaluated with the provided track finding and fitting algorithms based on the truth tracking method.Results and Conclusion The tracking geometry implemented in ACTS,including the sensitive elements and simplified material distribution,has been validated.The track parameter resolutions obtained with ACTS are consistent with the full simulation results over the momentum range under investigation.ACTS has proven to be an excellent platform for the tracking performance evaluation and the tracker layout optimization.展开更多
为了解决座底式长基线水声跟踪系统的高效校阵问题,结合工程项目实际提出一种智能化分组并行校阵方法。该方法利用水下基阵布阵施工时获得的水声及差分全球定位系统(Differential Global Positioning System,DGPS)测量数据为基准,在校...为了解决座底式长基线水声跟踪系统的高效校阵问题,结合工程项目实际提出一种智能化分组并行校阵方法。该方法利用水下基阵布阵施工时获得的水声及差分全球定位系统(Differential Global Positioning System,DGPS)测量数据为基准,在校阵试验中采用多个水下基阵分组并行校阵的快捷方式,根据自动反馈的测量数据进行校阵误差收敛测量,当满足事先设定的校准误差后,获得水下基阵的精确位置信息,同时完成多个水下基阵的阵型校准。最后,在某水域采用跑船试验的方式进行验证。长基线系统测量的船只航行轨迹与DGPS轨迹重合性好,证明该方法具有智能化程度高、测量精度高、测阵效率及经济性好等优点,具有较高的军事及民用价值。展开更多
联合甚长基线干涉测量(very long baseline interferometry,VLBI)时延数据与转发式(orbit determination by transfer tracking,ODTT)测距数据能够有效提高地球静止轨道(geostationary earth orbit,GEO)卫星定轨精度。参照位置精度衰减...联合甚长基线干涉测量(very long baseline interferometry,VLBI)时延数据与转发式(orbit determination by transfer tracking,ODTT)测距数据能够有效提高地球静止轨道(geostationary earth orbit,GEO)卫星定轨精度。参照位置精度衰减因子(position dilution of precision,PDOP)的改变,研究不同VLBI基线时延数据与转发式测距数据的联合对GEO卫星定轨精度的改善,可为特定条件下联合观测时VLBI基线的最优选择提供参考。基于中国科学院国家授时中心宽带VLBI系统和转发式测轨系统的实测数据,开展中星12号GEO卫星的定轨试验。试验结果表明定轨精度的提高与PDOP的降低成正相关。相比于转发式单独定轨,联合VLBI系统中的喀什—三亚基线,PDOP降低了3.00,定轨精度提高了11.48%;联合VLBI系统中的吉林—喀什基线,PDOP降低了3.38,定轨精度提高了14.73%;联合VLBI系统中的吉林—三亚基线,PDOP降低了6.90,定轨精度提高了19.75%;联合VLBI系统中的吉林—三亚和吉林—喀什两条基线,PDOP降低了9.94,定轨精度提高了27.23%。展开更多
基金The work is supported by the National Natural Science Foundation of China(GrantNo.11905237).
文摘Purpose A high-performance tracking system will be crucial for the realization of the full physics potential of the Circular Electron Positron Collider(CEPC)project.Abaseline tracker has been proposed in the Conceptual Design Report and requires detailed studies of the layout geometry and comprehensive understanding of its tracking performance.Methods A Common Tracking Software(ACTS)is an experiment-independent software package and introduced for the track reconstruction for particle and nuclear physics experiments.The CEPC baseline tracker geometry has been implemented in ACTS,and its tracking performance has been evaluated with the provided track finding and fitting algorithms based on the truth tracking method.Results and Conclusion The tracking geometry implemented in ACTS,including the sensitive elements and simplified material distribution,has been validated.The track parameter resolutions obtained with ACTS are consistent with the full simulation results over the momentum range under investigation.ACTS has proven to be an excellent platform for the tracking performance evaluation and the tracker layout optimization.
文摘通过分析中国深空网首次ΔDOR(Delta Differential One-way Ranging,双差分单向测距)联合测轨试验的干涉测量事后数据,重点从观测量随机精度、闭合时延等方面讨论了国内深空网与国内VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)观测网、国内深空网与国际深空网的联合干涉处理情况,并与ESOC(European Space Operation Center,欧洲空间操作中心)数据处理结果进行了比对。试验结果表明:我国深空网已具备独立或联合开展深空探测器导航测轨的系统支持能力;深空站系统具备高速率数据接收、采集、记录、传输能力,采集数据处理精度优于1ns;深空网干涉测量信号处理中心具备多体制信号的干涉处理分析能力,其分析精度与ESOC处理精度差异在0.1ns量级。
文摘为了解决座底式长基线水声跟踪系统的高效校阵问题,结合工程项目实际提出一种智能化分组并行校阵方法。该方法利用水下基阵布阵施工时获得的水声及差分全球定位系统(Differential Global Positioning System,DGPS)测量数据为基准,在校阵试验中采用多个水下基阵分组并行校阵的快捷方式,根据自动反馈的测量数据进行校阵误差收敛测量,当满足事先设定的校准误差后,获得水下基阵的精确位置信息,同时完成多个水下基阵的阵型校准。最后,在某水域采用跑船试验的方式进行验证。长基线系统测量的船只航行轨迹与DGPS轨迹重合性好,证明该方法具有智能化程度高、测量精度高、测阵效率及经济性好等优点,具有较高的军事及民用价值。
文摘联合甚长基线干涉测量(very long baseline interferometry,VLBI)时延数据与转发式(orbit determination by transfer tracking,ODTT)测距数据能够有效提高地球静止轨道(geostationary earth orbit,GEO)卫星定轨精度。参照位置精度衰减因子(position dilution of precision,PDOP)的改变,研究不同VLBI基线时延数据与转发式测距数据的联合对GEO卫星定轨精度的改善,可为特定条件下联合观测时VLBI基线的最优选择提供参考。基于中国科学院国家授时中心宽带VLBI系统和转发式测轨系统的实测数据,开展中星12号GEO卫星的定轨试验。试验结果表明定轨精度的提高与PDOP的降低成正相关。相比于转发式单独定轨,联合VLBI系统中的喀什—三亚基线,PDOP降低了3.00,定轨精度提高了11.48%;联合VLBI系统中的吉林—喀什基线,PDOP降低了3.38,定轨精度提高了14.73%;联合VLBI系统中的吉林—三亚基线,PDOP降低了6.90,定轨精度提高了19.75%;联合VLBI系统中的吉林—三亚和吉林—喀什两条基线,PDOP降低了9.94,定轨精度提高了27.23%。
