欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
传统的基于PPP（precise point positioning）模式的定轨方法采用浮点解,导致其定轨精度及可靠性较双差固定解稍差。为了进一步提高PPP模式事后定轨的精度和可靠性,利用2012年1月2～7日全球IGS跟踪站数据计算出当天所有卫星的宽巷和窄巷FCB产品,实现了GRACE卫星固定PPP整数模糊度的精密定轨。并将定轨结果分别与GFZ事后精密轨道、K波段测距结果进行比较,分析其内外符合精度。实验结果表明：与GFZ提供的事后精密轨道相比,GRACE-A卫星单天轨道固定解的精度为R方向2～3cm,T方向大部分优于2cm,N方向优于2cm,较之浮点解的定轨结果3个方向分别改善了约19%、30%、50%;GRACE-B卫星3个方向精度分别为2～3cm、2cm左右、1～2cm,较之浮点解各方向也有同等程度的改善。与K波段测距结果相比,浮点解的KBR残差STD均值为22.6mm,固定解为16.4mm,比浮点解提高了约28%。可见,PPP模糊度固定解明显改善了低轨卫星的定轨精度,能提供更可靠的轨道服务。
英文摘要：
With the development of space-borne GPS technologies and IGS precise orbit and clock products, precise orbit determination （POD） of Low Earth Orbiters （LEOs） based on PPP technology has become a hot issue. At present, an accuracy of 3~5 cm in Radial（R）, Along-track（T）, Cross-track（N） components can be achieved with conventional PPP. How- ever, the results are less precise or reliable than the double-differenced fixed solution due to the ambiguity-float solution in traditional PPP. In order to further improve the precision and reliability of POD with PPP, daily observations from all IGS tracking stations through day 2 to 7 in 2012 were used to estimate the wide and narrow-lane fractional cycle bias （FCB） of all satellites for PPP integer ambiguity resolution. The POD of the two GRACE satellites were respectively compared with GFZ~s post precise orbit and K-band measurements for the analy- sis of the inner and external conformities. As compared to GFZ, the daily orbital accuracy of the ambiguity-fixed solution in this work is about 2~3 cm in R direction, better than 2 cm in T direction and better than 2 cm in N direction for GRACE-A, an improvement of 19%, 30% and 50% respectively when compared with that of the float solution. The POD preci- sion for GRACE-B are 2-3 cm, 2 cm and 1-2 cm in R, N, T directions for the fixed solution, respectively. The accuracy improvement in the fixed solution for GARCE-B is nearly equiva- lent with that for GRACE-A. For K-band cases, the mean STD error of KBR residual is a- bout 16.4 mm for the fixed solution, and 22.6 mm for the float solution. These results show that PPP with ambiguity-fixed can greatly improve POD precision of LEO satellites and pro- vide more reliable orbital service.
同期刊论文项目
同项目期刊论文
Regional reference network augmented precise point positioning for instantaneous ambiguity resolutio
Real-time high-rate co-seismic displacement from ambiguity-fixed precise point positioning: Applicat
Removal of azimuth ambiguities and detection of a ship: using polarimetric airborne C-band SAR image
Unsupervised Classification of PolInSAR Data Based on Shannon Entropy Characterization With Iterativ
Fault rupture model of the 2008 Dangxiong (Tibet, China) Mw 6.3 earthquake from Envisat and ALOS dat
Assessment of correct fixing rate for precise point positioning ambiguity resolution on a global sca
A globally applicable, season-specific model for estimating the weighted mean temperature of the atm
Shortest path finding problem in stochastic time-dependent road networks with stochastic first-in-fi
Integrated point and edge matching on poor textural images constrained by self-adaptive triangulatio
Strain Rates in the Sichuan-Yunnan Region Based upon the Total Least Squares Heterogeneous Strain Mo
Flood detection and mapping of the Thailand Central plain using RADARSAT and MODIS under a sensor we
期刊信息
位置：