The Wide Field Survey Telescope(WFST)is located at 4200 m on Saishiteng Mountain in Lenghu,Qinghai Province,China.It features a primary mirror with a diameter of 2.5 m and a camera equipped with nine CCDs,providing a ...The Wide Field Survey Telescope(WFST)is located at 4200 m on Saishiteng Mountain in Lenghu,Qinghai Province,China.It features a primary mirror with a diameter of 2.5 m and a camera equipped with nine CCDs,providing a wide field of view of approximately 3×3 square degrees.Calibration parameters are essential to ensure the precision of astrometric observations with the WFST.These parameters are derived from geometric distortion(GD)and gaps through astrometric modeling and are subsequently validated via the Yao’An High Precision Telescope(YAHPT).The GD solutions show maximum distortions between 1.18 and 10.29 pixels for the WFST chips,with central chips exhibiting lower distortion.After applying the GD correction,the precision of the WFST reaches 4 mas.The interchip gaps of the WFST range from 1.922 mm to 7.765 mm,corresponding to 10μm/pixel,aligning with the design and measurements.The calibrated parameters guarantee that the WFST can perform highly accurate astrometric measurements.Furthermore,as the WFST undergoes updates,the parameter model remains consistently applicable.展开更多
本文基于时间序列分析的DDS(Dynamic Data System)建模法,对季节性的电离层总电子含量(TEC)时间序列观测值平稳化后建立自回归AR模型,提出以半参数AR模型对普通AR模型精化,并利用半参数AR模型对电离层TEC预报。实例分析表明:利用半参数A...本文基于时间序列分析的DDS(Dynamic Data System)建模法,对季节性的电离层总电子含量(TEC)时间序列观测值平稳化后建立自回归AR模型,提出以半参数AR模型对普通AR模型精化,并利用半参数AR模型对电离层TEC预报。实例分析表明:利用半参数AR模型对电离层TEC进行预报,在短期内半参数模型预报效果优于普通AR模型,但随着预报时间变长,则半参数模型预报精度明显下降,其预报效果则不如普通的AR模型。展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA0350300)the National Natural Science Foundation of China(12203105,12103091,62394351,12073008)the China Manned Space Project(CMS-CSST-2021-A12,CMS-CSST-2021-B10).
文摘The Wide Field Survey Telescope(WFST)is located at 4200 m on Saishiteng Mountain in Lenghu,Qinghai Province,China.It features a primary mirror with a diameter of 2.5 m and a camera equipped with nine CCDs,providing a wide field of view of approximately 3×3 square degrees.Calibration parameters are essential to ensure the precision of astrometric observations with the WFST.These parameters are derived from geometric distortion(GD)and gaps through astrometric modeling and are subsequently validated via the Yao’An High Precision Telescope(YAHPT).The GD solutions show maximum distortions between 1.18 and 10.29 pixels for the WFST chips,with central chips exhibiting lower distortion.After applying the GD correction,the precision of the WFST reaches 4 mas.The interchip gaps of the WFST range from 1.922 mm to 7.765 mm,corresponding to 10μm/pixel,aligning with the design and measurements.The calibrated parameters guarantee that the WFST can perform highly accurate astrometric measurements.Furthermore,as the WFST undergoes updates,the parameter model remains consistently applicable.
文摘本文基于时间序列分析的DDS(Dynamic Data System)建模法,对季节性的电离层总电子含量(TEC)时间序列观测值平稳化后建立自回归AR模型,提出以半参数AR模型对普通AR模型精化,并利用半参数AR模型对电离层TEC预报。实例分析表明:利用半参数AR模型对电离层TEC进行预报,在短期内半参数模型预报效果优于普通AR模型,但随着预报时间变长,则半参数模型预报精度明显下降,其预报效果则不如普通的AR模型。
