上海VLBI相关处理中心引进了一款国外新近研发的VLBI相关后处理软件PIMA，它在相位校准、复带通校准和条纹搜索等方面具有独到的优势，特别适合于射电源的成图和绝对天体测量。以亚太空间地球动力学计划（Asian Pacific Space Geodynam...上海VLBI相关处理中心引进了一款国外新近研发的VLBI相关后处理软件PIMA，它在相位校准、复带通校准和条纹搜索等方面具有独到的优势，特别适合于射电源的成图和绝对天体测量。以亚太空间地球动力学计划（Asian Pacific Space Geodynamics，APSG）测地VLBI观测为样本，介绍了PIMA软件及配套数据分析软件VTD／Post—Solve的特点和处理流程。对PIMA获得的观测量文件以及国际VLBI天体测量和大地测量服务（International VLBI Service for Geodesy and Astrometry,IVS）常规数据处理获得的观测量文件，分别进行了台站坐标和射电源位置参数解算。二者的解算结果在测量误差范围内一致，且在低信噪比情况下，PIMA获得了更多的观测量。后续的APSG观测将包括更多数量的微弱射电源。PIMA软件有望在此类数据处理中发挥重要作用。展开更多
During the first campaign of the Asian-Pacific space geodynamics (APSG) program in October 1997, two VLBl experiments were successfully organized and coordinated by the Astrometry and Geodesy VLBl Group of Shanghai As...During the first campaign of the Asian-Pacific space geodynamics (APSG) program in October 1997, two VLBl experiments were successfully organized and coordinated by the Astrometry and Geodesy VLBl Group of Shanghai Astronomical Observatory, the Chinese Academy of Sciences, cooperated with geodetic VLBl group, GSFC, NASA, USA. Six VLBl stations participated in the experiments, including Seshan and Urumqi station of China, Gilcreek station in Alaska and Kokee station in Hawaii of USA, Kashima station of Japan and Hobart station at Tasmania of Australia. Baseline lengths are from 1 900 to 11 000 km and the mean relative uncertainty of the baseline length measurements is 1.0 x 10-9. In addition, the rates of the baseline lengths among the six stations and their three-dimensional velocities are solved out via global analysis of the two APSG sessions and the historical observations of the six stations as well as other VLBl observations from the global observation network. These results are appreciable to the studies of the modern crustal movement in the Asian-Pacific region. Especially,an 8 mm/a eastward motion and a 14 mm/a north by northeast motion are detected respectively for Seshan and Urumqi stations relative to the stable part of the Eurasian plate. The motions directly illustrate the effect of the northward movement of Indian plate on the modern crustal motions of the northwestern and the eastern part of China, which is of important significance to the study of the modern crustal motion of China.展开更多
文摘上海VLBI相关处理中心引进了一款国外新近研发的VLBI相关后处理软件PIMA，它在相位校准、复带通校准和条纹搜索等方面具有独到的优势，特别适合于射电源的成图和绝对天体测量。以亚太空间地球动力学计划（Asian Pacific Space Geodynamics，APSG）测地VLBI观测为样本，介绍了PIMA软件及配套数据分析软件VTD／Post—Solve的特点和处理流程。对PIMA获得的观测量文件以及国际VLBI天体测量和大地测量服务（International VLBI Service for Geodesy and Astrometry,IVS）常规数据处理获得的观测量文件，分别进行了台站坐标和射电源位置参数解算。二者的解算结果在测量误差范围内一致，且在低信噪比情况下，PIMA获得了更多的观测量。后续的APSG观测将包括更多数量的微弱射电源。PIMA软件有望在此类数据处理中发挥重要作用。
文摘During the first campaign of the Asian-Pacific space geodynamics (APSG) program in October 1997, two VLBl experiments were successfully organized and coordinated by the Astrometry and Geodesy VLBl Group of Shanghai Astronomical Observatory, the Chinese Academy of Sciences, cooperated with geodetic VLBl group, GSFC, NASA, USA. Six VLBl stations participated in the experiments, including Seshan and Urumqi station of China, Gilcreek station in Alaska and Kokee station in Hawaii of USA, Kashima station of Japan and Hobart station at Tasmania of Australia. Baseline lengths are from 1 900 to 11 000 km and the mean relative uncertainty of the baseline length measurements is 1.0 x 10-9. In addition, the rates of the baseline lengths among the six stations and their three-dimensional velocities are solved out via global analysis of the two APSG sessions and the historical observations of the six stations as well as other VLBl observations from the global observation network. These results are appreciable to the studies of the modern crustal movement in the Asian-Pacific region. Especially,an 8 mm/a eastward motion and a 14 mm/a north by northeast motion are detected respectively for Seshan and Urumqi stations relative to the stable part of the Eurasian plate. The motions directly illustrate the effect of the northward movement of Indian plate on the modern crustal motions of the northwestern and the eastern part of China, which is of important significance to the study of the modern crustal motion of China.
