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国家自然科学基金(11173049)

作品数:20 被引量:87H指数:6
相关作者:钟敏许厚泽员美娟郑伟吴斌更多>>
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20 条 记 录,以下是 1-10
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Physical analysis on improving the recovery accuracy of the Earth's gravity field by a combination of satellite observations in along-track and cross-track directions被引量:4
2014年
The physical investigations on the accuracy improvement to the measurement of the Earth's gravity field recovery are carried out based on the next-generation Pendulum-A/B out-of-plane twin-satellite formation in this paper. Firstly, the Earth's gravity field complete up to degree and order 100 is, respectively, recovered by the collinear and pendulum satellite formations using the orbital parameters of the satellite and the matching accuracies of key payloads from the twin GRACE satellites. The research results show that the accuracy of the Earth's gravity field model from the Pendulum-A/B satellite formation is about two times higher than from the collinear satellite formation, and the further improvement of the determination accuracy of the Earth's gravity field model is feasible by the next-generation Pendulum-A/B out-of-plane twin-satellite formation. Secondly, the Earth's gravity field from Pendulum-A/B complete up to degree and order 100 is accurately recovered based on the orbital parameters of the satellite (e.g., an orbital altitude of 400 km, an intersatellite range of 100 km, an orbital inclination of 89° and an orbital eccentricity of 0.001), the matching accuracies of space- borne instruments (e.g. 10-6 m in the intersatellite range, 10-3 m in the orbital position, 10-6 m/s in orbital velocity, and 10-11 m/s2 in non-conservative force), an observation time of 30 days and a sampling interval of 10 s. The measurement accuracy of the Earth's gravity field from the next-generation Pendulum-A/B out-of-plane twin-satellite formation is full of promise for being improved by about l0 times compared with that from the current GRACE satellite formation. Finally, the physical requirements for the next-generation Pendulum-A/B out-of-plane twin-satellite formation are analyzed, and it is proposed that the satellite orbital altitude be preferably designed to be close to 400±50 km and the matching precision of key sensors from the Pendulum-A/B mission be about one order of magnitude higher tha
郑伟许厚泽钟敏员美娟
Analysis of the characteristics of the harmonics coefficient J_2 of the Earth's gravity field in different periods被引量:2
2012年
The characteristics of the geopotential coefficient J2 in different periods are analyzed using satellite laser ranging data spanning the last 27 years.The satellites used in the analysis are Lageos1 and Lageos2.The variations in J2 are obtained by determining the dynamic orbit.The results show that there are strong seasonal and long-term variations.For different data spans,the seasonal variations agree well in terms of both amplitude and phase.Using all the data,the amplitude and phase of the annual term are 2.5 10-10 and 127°,respectively,while the amplitude and phase of the semiannual term are 0.94 10-10 and 213°,respectively.In the case of long-term variation,the secular variation in J2(J2) is-2.2 10-11 a-1 from 1984 to 2010.J2 differs for the different periods because of interannual variations,such as the "1998 anomaly".Another anomaly may have taken place during 2007-2010.Although the cause of the anomaly is unknown,it is an important observational constraint on the shape of the Earth.
QU WeiJingWU Bin
关键词:地球重力场卫星激光测距年际变化
Effect of different inter-satellite range on measurement precision of Earth’s gravitational field from GRACE被引量:3
2012年
The precision of Earth's gravitational field from GRACE up to degree and order 120 was studied for different inter-satellite ranges using the improved energy conservation principle. Our simulated result shows that: For long wavelength (L≤20) at degree 20, the cumulative geoid-height error gradually decreased with increasing range, from 0. 052 cm for 110 km to 1. 156 times and 1. 209 times as large for 220 km and 330 kin, respectively. For medium-wavelength ( 100 ≤ L ≤ 120) at degree 120, the cumulative geoid-height error de- creased from 13. 052 cm for 110 km, to 1. 327 times and 1. 970 times as large for the ranges of 220 km and 330 km, respectively; By adopting an optimal range of 220 ± 50 km, we can suppress considerably the loss of precision in the measurement of the Earth' s long-wavelength and medium-wavelength gravitational field.
Zheng WeiHsu HoutseZhong MinYun MeijuanZhou Xuhua
关键词:GRACE
我国将来更高精度CSGM卫星重力测量计划研究被引量:4
2014年
基于卫星跟踪模式的优化选取、关键载荷的优化组合、轨道参数的优化设计、仿真模拟的先期启动和反演方法的优化改进,开展了我国将来CSGM(China’SSatellite Gravity Mission)卫星重力测量计划实施的研究论证。由于卫星跟踪卫星高低/低低(SST-HL/LL)模式对地球中长波重力场的探测精度较高、技术要求相对较低,而且可借鉴当前GRACE卫星的成功经验,因此建议将来CSGM卫星重力测量计划采用SST-HL/LL模式;建议开展激光干涉星问测距仪、复合GPS接收机、非保守力补偿系统、卫星体和加速度计质心调节装置等关键载荷的先期研制;建议将来CSGM卫星的轨道高度(300~400km)和星间距离(100±50km)选择在已有重力卫星的测量盲区;建议将仿真技术应用于CSGM卫星的方案论证、系统设计、部件研制、产品检验、空中使用、故障分析等研发和运行的全过程;对比分析了卫星轨道摄动法、动力学法、能量守恒法和加速度法的优缺点,建议寻求新型、高精度、高效率和全频段的卫星重力反演方法;提出将来CSGM卫星重力测量计划的预期科学目标:在300阶处,累计大地水准面精度和累计重力异常精度分别为1~5cm和1~5mGal。
郑伟许厚泽钟敏刘成恕员美娟
关键词:卫星跟踪卫星
基于下一代三向车轮双星编队改善地球重力场空间分辨率研究被引量:6
2015年
由于当前GRACE(Gravity Recovery and Climate Experiment)串行式编队存在"南北向条带误差"等缺陷,因此本文基于星间速度插值法开展了利用下一代三向车轮双星编队ACR(Along-Cross-Radial)-Cartwheel提高地球重力场空间分辨率的可行性研究论证.第一,采用GRACE卫星轨道参数和关键载荷精度,利用三向车轮双星编队ACR-Cartwheel-A/B反演了120阶地球重力场.结果表明:基于ACR-Cartwheel-A/B双星编队反演地球重力场的模拟精度较德国波茨坦地学研究中心(GFZ)公布的EIGEN-GRACE02S地球重力场模型的实测精度平均提高2.6倍,从而检验了基于下一代三向车轮双星编队ACR-Cartwheel-A/B反演地球重力场精度优于当前GRACE串行式双星编队的可行性.第二,通过星间速度插值法,采用卫星轨道参数(初始轨道高度350km、平均星间距离100km、初始轨道倾角89°、初始轨道离心率0.0046)、卫星关键载荷精度指标(星间速度10-7 m·s-1、轨道位置10-3 m、轨道速度10-6 m·s-1、非保守力10-11 m·s-2)、观测时间30天和采样间隔10s,基于经向车轮双星编队Lo-AR(Longitudinal-Along-Radial)-Cartwheel-A/B、纬向车轮双星编队La-AR(Latitudinal-Along-Radial)-Cartwheel-A/B和三向车轮双星编队ACR-Cartwheel-A/B,分别反演了120阶地球重力场;在120阶处,累计大地水准面精度分别为5.115×10-4 m、4.923×10-4 m和3.488×10-4 m.结果表明:(1)由于La-AR-Cartwheel-A/B编队的轨道稳定性优于Lo-AR-Cartwheel-A/B编队,因此基于La-AR-Cartwheel-A/B编队反演重力场精度高于Lo-AR-CartwheelA/B编队;(2)由于ACR-Cartwheel-A/B编队可以同时获得轨向、垂向和径向的重力场信息,卫星观测数据具有各向同性优点,因此ACR-Cartwheel-A/B编队是建立下一代高精度和高空间分辨地球重力场模型的优化选择.
郑伟许厚泽钟敏员美娟
关键词:空间分辨率轨道根数
跨障碍GPS高程传递控制网布设方案研究被引量:2
2015年
针对EGM2008重力场模型辅助跨障碍GPS高程传递控制网布设方案进行研究,分别对GPS高程传递控制网进行不同点数的椭球高约束计算,将传递高程与实测高程进行比较,结果表明:跨越2~3 km的障碍GPS高程传递的精度能够达到0.010 m,GPS高程传递控制网中以约束一点椭球高为宜,增加椭球高约束个数并不能提高高程传递的精度。
宋黎民宋雷
关键词:高程异常
Precise orbit determination of Haiyang-2 using satellite laser ranging被引量:8
2013年
With the successful launch and official commissioning of China's first dynamic ocean environment satellite Haiyang-2(HY-2),China's capabilities for oceanic environment monitoring and oceanic resource detecting have been further improved and enhanced.Precise tracking and orbit determination are not only key technical concerns in the ocean dynamic environment satellite project but also necessary conditions for carrying out related oceanic science research using observational data obtained using spaceborne instruments including radar altimeter.In this study,the current available status of international satellite laser ranging(SLR) monitoring on HY-2 was introduced.Six-months of SLR data from HY-2 were processed to obtain precise satellite orbit information using the dynamic orbit determination method.We carried out a detailed assessment of the SLR orbit accuracy by internal evaluation,comparisons with the orbit derived by the French Doppler orbitography and radio-positioning integrated by satellite(DORIS) system,and station-satellite distance validation.These assessments indicate that the three-dimensional orbital accuracy of HY-2 is about 12.5 cm,and the radial accuracy is better than 3 cm.It provides a good example of the application of international SLR monitoring and precise orbit determination in China's earth observation satellite project.
ZHAO GangZHOU XuHuaWU Bin
关键词:卫星激光测距精密定轨海洋环境监测地球观测卫星定轨精度
利用光电模拟数据的空间碎片经验力补偿评估被引量:1
2016年
空间碎片对人类航天活动具有严重的威胁,需要对其进行测量和编目。随着空间探测技术的进步,碎片的测量精度不断提高,测站不断增加,需要进一步提高空间碎片的定轨及预报精度。本文利用Terra SAR-X卫星的精密星历,模拟测站对空间碎片的光电测量,并基于相同精度的多站赤经、赤纬模拟数据,评估经验力补偿模型对空间碎片轨道及预报精度的影响。根据模拟数据计算结果,引入经验力模型可使约50%的数据弧段计算的轨道及预报精度提升约25%。
孙浩吴斌周旭华
关键词:光电测量精密定轨
基于GRACE Follow-On卫星重力梯度法精确反演地球重力场被引量:8
2014年
由于GRACE Follow-On双星系统等效于基线长为星间距离的一维水平重力梯度仪,因此本文基于GRACE Follow—On卫星重力梯度法开展了精确和快速反演下一代地球重力场的可行性论证研究.研究结果表明:第一,基于GRACE Follow-On卫星重力梯度法(GFO-SGGM),利用卫星轨道参数(轨道高度250km、星间距离50km、轨道倾角89°、轨道离心率0.001)、关键载荷测量精度(星间距离10^-6m、星间速度10^-7m·s^-1、星间加速度10^-10 m·s^-2、轨道位置10^-3m、轨道速度10^-6m·s^-1、非保守力10^-11 m·s^-2)、观测时间30天和采样间隔10s反演了120阶地球重力场,在120阶处累计大地水准面精度为9.331×10^-4m.第二,在120阶内,利用将来GRACE Follow—On双星反演地球重力场精度较现有GRACE双星平均提高61倍,因此GRACE Follow-On卫星重力梯度法是进一步提高地球重力场反演精度的优选方法.第三,下一代GRACE Follow—On计划较当前GRACE计划的优点如下:轨道高度更低(200-300km)、载荷精度更高(10^-7~10^-9m·s^-1)和星间距离更短(50--100km).
郑伟许厚泽钟敏员美娟
关键词:GRACE地球重力场
下一代月球卫星重力梯度计划Moon-SGG研究
<正>1.研究背景基于由美国宇航局(NASA)和德国航空航天局(DLR)共同研制开发,并于2002年3月17日发射升空的GRACE(Gravity Recovery and Climate Experiment)双星的卫...
郑伟许厚泽钟敏
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