The seven co-located sites of the Crustal Movement Observation Network of China（CMONOC） in Shanghai, Wuhan, Kunming, Beijing, Xi＇an, Changchun, and Urumqi are equipped with Global Navigation Satellite System（GNSS...The seven co-located sites of the Crustal Movement Observation Network of China（CMONOC） in Shanghai, Wuhan, Kunming, Beijing, Xi＇an, Changchun, and Urumqi are equipped with Global Navigation Satellite System（GNSS）, very long baseline interferometry（VLBI）, and satellite laser ranging（SLR） equipment. Co-location surveying of these sites was performed in 2012 and the accuracies of the solved tie vectors are approximately 5 mm.This paper proposes a mathematical model that handles the least squares adjustment of the 3D control network and calculates the tie vectors in one step, using all the available constraints in the adjustment. Using the new mathematical model, local tie vectors can be more precisely determined and their covariance more reasonably estimated.展开更多
By using the results of changing rate of the baseline lengths from Shanghai VLBI station to 13 international VLBI stations, respectively, the vertical and horizontal velocities of Shanghai VLBI station are re estimate...By using the results of changing rate of the baseline lengths from Shanghai VLBI station to 13 international VLBI stations, respectively, the vertical and horizontal velocities of Shanghai VLBI station are re estimated by means of the Least Square Fit method based on the international VLBI station velocities of ITRF96, and the Euler vectors of Eurasian tectonic plate of Sillard et al (1998). The results are such the vertical velocity: -1 86±0 84 mm/yr, horizontal velocity and its local azimuth: 14 24±0 97 mm/yr, E -12° 49±2° 98 S. If the NNR NUVEL 1A model is used instead of the Euler vectors of Sillard et al., the corresponding results are such -1 86±0 84 mm/yr, 10 56±0 96 mm/yr, E -16° 07±4° 06 S. In addition, the corresponding results for the Urumqi VLBI station are also estimated.展开更多
Affiliation unit: Urumqi Astronomic Observatory, CAS Mainresearch field and disciplinary orientations: Taking radio-astronomy as its main research field,the Station concentrates its efforts on radio-astrophysics, astr...Affiliation unit: Urumqi Astronomic Observatory, CAS Mainresearch field and disciplinary orientations: Taking radio-astronomy as its main research field,the Station concentrates its efforts on radio-astrophysics, astro-telemetry, astro-geodynamics and related techniques. The main research orientations are in the following aspects:展开更多
对VLBI(Very Long Baseline Interferometry)台站电磁兼容性的特点及其影响因素进行了分析;在对几种常用的评估方法对系统的适用性论证的基础上,借鉴网络层次分析法(ANP)中建模及求解权重的原理,结合理想点排序法(TOPSIS)的优点,并运用...对VLBI(Very Long Baseline Interferometry)台站电磁兼容性的特点及其影响因素进行了分析;在对几种常用的评估方法对系统的适用性论证的基础上,借鉴网络层次分析法(ANP)中建模及求解权重的原理,结合理想点排序法(TOPSIS)的优点,并运用权系数确定的区间调整法降低主观因素的影响,提出一种适用于系统电磁兼容性的改进的ANP-TOPSIS综合评估方法;建立了系统网络层次评估模型;具有十分重要的理论及工程应用价值。展开更多
介绍了乌鲁木齐南山观测站VLBI(Very Long Baseline Interferometry)台站的组成及电磁兼容性特点,并针对系统内布线特点进行电磁兼容性分析,给出了克服线缆间相互干扰的措施和方法,为工程设计人员在VLBI台站布线设计及维护方面提供一些...介绍了乌鲁木齐南山观测站VLBI(Very Long Baseline Interferometry)台站的组成及电磁兼容性特点,并针对系统内布线特点进行电磁兼容性分析,给出了克服线缆间相互干扰的措施和方法,为工程设计人员在VLBI台站布线设计及维护方面提供一些有效的解决方案,具有一定的工程意义。展开更多
This paper presents the past,present and future status of the Russian VLBI network "Quasar".This network has been developed for at least 20 years by the Institute of Applied Astronomy of the Russian Academy ...This paper presents the past,present and future status of the Russian VLBI network "Quasar".This network has been developed for at least 20 years by the Institute of Applied Astronomy of the Russian Academy of Sciences(IAA RAS). The equipment installed currently at each "Quasar" station and the facilities for processing observational data are described briefly. The latest results are presented, including the Earth orientation parameters(EOP) determined from the "Quasar" VLBI data and comparison with those from other processing centers. Our future plans to extend the "Quasar" VLB I network to the east and to the west will be carried out by establishing the Ussurijsk station in the Far East and the RussianCuban station in the west. They are considered in the context of the Russian section activity in the GGOS project. The expected improvement of the EOP determination accuracy can be obtained within the future configuration of the "Quasar" network,which is proved by simulation.展开更多
用于深空测控任务的干涉测量天线的高精度站址测量对于深空航天器的高精度导航具有重要意义。为此,结合国内外对干涉测量天线高精度站址测量技术的研究、试验及成果,对2种站址测量方法——测地VLBI(Very Long Baseline Interferometry,...用于深空测控任务的干涉测量天线的高精度站址测量对于深空航天器的高精度导航具有重要意义。为此,结合国内外对干涉测量天线高精度站址测量技术的研究、试验及成果,对2种站址测量方法——测地VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)方法和归心测量方法的原理、现状进行了总结与比较:测地VLBI方法最为直接有效,且测量精度高;归心测量方法能反映参考点的本地变化,可提供站址初值,且便于连续监测;2种方法优势互补。在此基础上,对高精度站址测量技术未来的发展方向进行了展望。该领域技术的发展现状对我国深空测控网的后续建设具有重要的借鉴意义。展开更多
推导了传统全球卫星导航定位系统(GNSS)测定垂线偏差(Deflection of the Vertical, DOV)形式误差的表达式;提出一种可用以解算并置站DOV的小网参数转换法.利用乌鲁木齐南山多技术并置站控制网观测信息,开展了算法验证,并对该站内多个地...推导了传统全球卫星导航定位系统(GNSS)测定垂线偏差(Deflection of the Vertical, DOV)形式误差的表达式;提出一种可用以解算并置站DOV的小网参数转换法.利用乌鲁木齐南山多技术并置站控制网观测信息,开展了算法验证,并对该站内多个地点DOV开展了实测.结果表明,高精度的小网DOV仅由点位观测精度最高、覆盖面积最广的3个站点决定.个别精度较差的点会为DOV的测定值带来较大的不确定性;采用小网转换法所解算的DOV与实测值间的一致性分别为-2.3″±4.3″(子午分量)和0.2″±4.6″(卯酉分量);小网转换求取DOV的方法在精度上与经典的GNSS水准方法相当,但步骤更加简便.鉴于多技术并置站会不定期地开展本地测量,可利用该方法实现多技术并置站DOV的零成本长期监测.展开更多
A dedicated 24 h S/X dual-band geodetic very long baseline interferometry(VLBI) experiment was conducted in January 2015 with the goal of improving the position estimates for the Chinese Deep Space Station Kashi. Prev...A dedicated 24 h S/X dual-band geodetic very long baseline interferometry(VLBI) experiment was conducted in January 2015 with the goal of improving the position estimates for the Chinese Deep Space Station Kashi. Previously, the position estimates had been only accurate to ~20 cm, which is insufficient for future Chinese deep space explorations. The experiment design and data reduction are described with special emphasis on the limited frequency ranges of Kashi for bandwidth synthesis. A narrowed multi-band delay search window based on post-fit residuals was utilized to resolve the sub-ambiguities due to the drop of a frequency channel in fringe fit, which saved ~22% of the observations from the affected baseline. Final position estimates of Kashi were obtained from the global solution by using more than 5300 international VLBI sessions from August 1979 to September 2015, and estimates were found to be accurate to about 10, 25, and 20 mm in the X, Y, and Z components. Various statistical tests were run, and the estimates and precisions are believed to be reliable.展开更多
基金sponsored by the Crustal Movement Observation Network of China(CMONOC)partially supported by the Natural Science Foundation of China(41274035,41174023)
文摘The seven co-located sites of the Crustal Movement Observation Network of China（CMONOC） in Shanghai, Wuhan, Kunming, Beijing, Xi＇an, Changchun, and Urumqi are equipped with Global Navigation Satellite System（GNSS）, very long baseline interferometry（VLBI）, and satellite laser ranging（SLR） equipment. Co-location surveying of these sites was performed in 2012 and the accuracies of the solved tie vectors are approximately 5 mm.This paper proposes a mathematical model that handles the least squares adjustment of the 3D control network and calculates the tie vectors in one step, using all the available constraints in the adjustment. Using the new mathematical model, local tie vectors can be more precisely determined and their covariance more reasonably estimated.
文摘By using the results of changing rate of the baseline lengths from Shanghai VLBI station to 13 international VLBI stations, respectively, the vertical and horizontal velocities of Shanghai VLBI station are re estimated by means of the Least Square Fit method based on the international VLBI station velocities of ITRF96, and the Euler vectors of Eurasian tectonic plate of Sillard et al (1998). The results are such the vertical velocity: -1 86±0 84 mm/yr, horizontal velocity and its local azimuth: 14 24±0 97 mm/yr, E -12° 49±2° 98 S. If the NNR NUVEL 1A model is used instead of the Euler vectors of Sillard et al., the corresponding results are such -1 86±0 84 mm/yr, 10 56±0 96 mm/yr, E -16° 07±4° 06 S. In addition, the corresponding results for the Urumqi VLBI station are also estimated.
文摘Affiliation unit: Urumqi Astronomic Observatory, CAS Mainresearch field and disciplinary orientations: Taking radio-astronomy as its main research field,the Station concentrates its efforts on radio-astrophysics, astro-telemetry, astro-geodynamics and related techniques. The main research orientations are in the following aspects:
文摘对VLBI(Very Long Baseline Interferometry)台站电磁兼容性的特点及其影响因素进行了分析;在对几种常用的评估方法对系统的适用性论证的基础上,借鉴网络层次分析法(ANP)中建模及求解权重的原理,结合理想点排序法(TOPSIS)的优点,并运用权系数确定的区间调整法降低主观因素的影响,提出一种适用于系统电磁兼容性的改进的ANP-TOPSIS综合评估方法;建立了系统网络层次评估模型;具有十分重要的理论及工程应用价值。
文摘介绍了乌鲁木齐南山观测站VLBI(Very Long Baseline Interferometry)台站的组成及电磁兼容性特点,并针对系统内布线特点进行电磁兼容性分析,给出了克服线缆间相互干扰的措施和方法,为工程设计人员在VLBI台站布线设计及维护方面提供一些有效的解决方案,具有一定的工程意义。
文摘This paper presents the past,present and future status of the Russian VLBI network "Quasar".This network has been developed for at least 20 years by the Institute of Applied Astronomy of the Russian Academy of Sciences(IAA RAS). The equipment installed currently at each "Quasar" station and the facilities for processing observational data are described briefly. The latest results are presented, including the Earth orientation parameters(EOP) determined from the "Quasar" VLBI data and comparison with those from other processing centers. Our future plans to extend the "Quasar" VLB I network to the east and to the west will be carried out by establishing the Ussurijsk station in the Far East and the RussianCuban station in the west. They are considered in the context of the Russian section activity in the GGOS project. The expected improvement of the EOP determination accuracy can be obtained within the future configuration of the "Quasar" network,which is proved by simulation.
文摘用于深空测控任务的干涉测量天线的高精度站址测量对于深空航天器的高精度导航具有重要意义。为此,结合国内外对干涉测量天线高精度站址测量技术的研究、试验及成果,对2种站址测量方法——测地VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)方法和归心测量方法的原理、现状进行了总结与比较:测地VLBI方法最为直接有效,且测量精度高;归心测量方法能反映参考点的本地变化,可提供站址初值,且便于连续监测;2种方法优势互补。在此基础上,对高精度站址测量技术未来的发展方向进行了展望。该领域技术的发展现状对我国深空测控网的后续建设具有重要的借鉴意义。
文摘推导了传统全球卫星导航定位系统(GNSS)测定垂线偏差(Deflection of the Vertical, DOV)形式误差的表达式;提出一种可用以解算并置站DOV的小网参数转换法.利用乌鲁木齐南山多技术并置站控制网观测信息,开展了算法验证,并对该站内多个地点DOV开展了实测.结果表明,高精度的小网DOV仅由点位观测精度最高、覆盖面积最广的3个站点决定.个别精度较差的点会为DOV的测定值带来较大的不确定性;采用小网转换法所解算的DOV与实测值间的一致性分别为-2.3″±4.3″(子午分量)和0.2″±4.6″(卯酉分量);小网转换求取DOV的方法在精度上与经典的GNSS水准方法相当,但步骤更加简便.鉴于多技术并置站会不定期地开展本地测量,可利用该方法实现多技术并置站DOV的零成本长期监测.
基金supported by China’s Lunar Exploration Key Techniques Research Program (Grant No. TY3Q20100009)
文摘A dedicated 24 h S/X dual-band geodetic very long baseline interferometry(VLBI) experiment was conducted in January 2015 with the goal of improving the position estimates for the Chinese Deep Space Station Kashi. Previously, the position estimates had been only accurate to ~20 cm, which is insufficient for future Chinese deep space explorations. The experiment design and data reduction are described with special emphasis on the limited frequency ranges of Kashi for bandwidth synthesis. A narrowed multi-band delay search window based on post-fit residuals was utilized to resolve the sub-ambiguities due to the drop of a frequency channel in fringe fit, which saved ~22% of the observations from the affected baseline. Final position estimates of Kashi were obtained from the global solution by using more than 5300 international VLBI sessions from August 1979 to September 2015, and estimates were found to be accurate to about 10, 25, and 20 mm in the X, Y, and Z components. Various statistical tests were run, and the estimates and precisions are believed to be reliable.
