为实现五百米口径球面射电望远镜(Five-hundred meter Aperture Spherical radio Telescope,FAST)馈源支撑系统馈源终端的高精度轨迹跟踪及防止馈源支撑索力超限,研究了馈源支撑系统星形框架和AB轴机构对目标终端位姿的分配算法。首先,...为实现五百米口径球面射电望远镜(Five-hundred meter Aperture Spherical radio Telescope,FAST)馈源支撑系统馈源终端的高精度轨迹跟踪及防止馈源支撑索力超限,研究了馈源支撑系统星形框架和AB轴机构对目标终端位姿的分配算法。首先,根据馈源支撑系统机构特征,综合馈源舱的重心时变及其采用的回照策略,建立了带有馈源舱回照策略的考虑馈源舱重心时变的悬索牵引并联系统力学模型。然后,为解决AB轴机构与星形框架间的运动耦合问题,设计了两种馈源支撑系统位姿分配算法:优先保障六索索力均衡的位姿分配算法和优先保障馈源接收终端定位精度的位姿分配算法。最后,通过仿真对两种算法在馈源终端定位精度和索力分布情况两个方面的性能进行分析。仿真结果表明:前一算法能使六索索力分配均匀,但是引入了最大1.2°的馈源接收终端指向误差,已超出工程指向精度范围。后一算法的六索索力波动较大,但索力没超限或虚牵,能保证馈源接收终端的位姿,此算法满足工程需求。展开更多
The paper relates to a motion planning algorithm for the feed support system of the Five-hundred-meter Aperture Spherical radio Telescope(FAST).To enhance the stability of the feed support system,the start/termination...The paper relates to a motion planning algorithm for the feed support system of the Five-hundred-meter Aperture Spherical radio Telescope(FAST).To enhance the stability of the feed support system,the start/termination planning segments are adopted with an acceleration and deceleration section.The source switching planning adopts a combination of a line segment and focal segment to realize stable control of the feed support system.Besides,during the observation trajectory,a transition segment which is not used for observation data is planned with a required time.Through an example simulation,a smooth change is realized via the motion planning algorithm and presented in this paper.展开更多
Fast radio bursts(FRBs) are highly dispersed millisecond-duration radio bursts,[1,2]of which the physical origin is still not fully understood. FRB 20201124A is one of the most actively repeating FRBs. In this paper, ...Fast radio bursts(FRBs) are highly dispersed millisecond-duration radio bursts,[1,2]of which the physical origin is still not fully understood. FRB 20201124A is one of the most actively repeating FRBs. In this paper, we present the collection of 1863 burst dynamic spectra of FRB 20201124A measured with the Five-hundred-meter Aperture Spherical radio Telescope(FAST). The current collection, taken from the observation during the FRB active phase from April to June 2021, is the largest burst sample detected for any FRB so far. The standard PSRFITs format is adopted, including dynamic spectra of the burst, and the time information of the dynamic spectra, in addition, mask files help readers to identify the pulse positions are also provided. The dataset is available in Science Data Bank, with the link https://www.doi.org/10.57760/sciencedb.j00113.00076.展开更多
文摘为实现五百米口径球面射电望远镜(Five-hundred meter Aperture Spherical radio Telescope,FAST)馈源支撑系统馈源终端的高精度轨迹跟踪及防止馈源支撑索力超限,研究了馈源支撑系统星形框架和AB轴机构对目标终端位姿的分配算法。首先,根据馈源支撑系统机构特征,综合馈源舱的重心时变及其采用的回照策略,建立了带有馈源舱回照策略的考虑馈源舱重心时变的悬索牵引并联系统力学模型。然后,为解决AB轴机构与星形框架间的运动耦合问题,设计了两种馈源支撑系统位姿分配算法:优先保障六索索力均衡的位姿分配算法和优先保障馈源接收终端定位精度的位姿分配算法。最后,通过仿真对两种算法在馈源终端定位精度和索力分布情况两个方面的性能进行分析。仿真结果表明:前一算法能使六索索力分配均匀,但是引入了最大1.2°的馈源接收终端指向误差,已超出工程指向精度范围。后一算法的六索索力波动较大,但索力没超限或虚牵,能保证馈源接收终端的位姿,此算法满足工程需求。
基金funded by the National Natural Science Foundation of China(Grant Nos.11203048 and 11973062)the Youth Innovation Promotion Association CAS+1 种基金the Open Project Program of the Key Laboratory of FASTNational Astronomical Observatories,Chinese Academy of Sciences
文摘The paper relates to a motion planning algorithm for the feed support system of the Five-hundred-meter Aperture Spherical radio Telescope(FAST).To enhance the stability of the feed support system,the start/termination planning segments are adopted with an acceleration and deceleration section.The source switching planning adopts a combination of a line segment and focal segment to realize stable control of the feed support system.Besides,during the observation trajectory,a transition segment which is not used for observation data is planned with a required time.Through an example simulation,a smooth change is realized via the motion planning algorithm and presented in this paper.
基金supported by the National SKA Program of China (Grant Nos. 2020SKA0120100 and 2020SKA0120200)the National Natural Science Foundation of China (Grant Nos. 12041304, 11873067, 11988101, 12041303, 11725313, 11725314, 11833003, 12003028, 12041306, 12103089, U2031209, U2038105, and U1831207)+8 种基金the National Key Research and Development Program of China (Grant Nos. 2019YFA0405100, 2017YFA0402602, 2018YFA0404204, and 2016YFA0400801)Key Research Program of the Chinese Academy of Sciences (Grant No. QYZDJ-SSW-SLH021)Natural Science Foundation of Jiangsu Province (Grant No. BK20211000)Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS, the Strategic Priority Research Program on Space Science, the Western Light Youth Project of Chinese Academy of Sciences (Grant Nos. XDA15360000, XDA15052700, and XDB23040400)funding from the MaxPlanck Partner Group, the science research grants from the China Manned Space Project (Grant Nos. CMS-CSST2021-B11 and CMS-CSST-2021-A11)PKU development (Grant No. 7101502590)support from the XPLORER PRIZEsupported by Fundamental Research Funds for the Central Universities (Grant No. 14380046)the Program for Innovative Talents, Entrepreneur in Jiangsu。
文摘Fast radio bursts(FRBs) are highly dispersed millisecond-duration radio bursts,[1,2]of which the physical origin is still not fully understood. FRB 20201124A is one of the most actively repeating FRBs. In this paper, we present the collection of 1863 burst dynamic spectra of FRB 20201124A measured with the Five-hundred-meter Aperture Spherical radio Telescope(FAST). The current collection, taken from the observation during the FRB active phase from April to June 2021, is the largest burst sample detected for any FRB so far. The standard PSRFITs format is adopted, including dynamic spectra of the burst, and the time information of the dynamic spectra, in addition, mask files help readers to identify the pulse positions are also provided. The dataset is available in Science Data Bank, with the link https://www.doi.org/10.57760/sciencedb.j00113.00076.
