北斗卫星导航系统的星座性能分析   总被引：2，自引：0，他引：2  

杨鑫春  徐必礼  胡杨 《测绘科学》2013,38(2)

本文分析了星座结构为5颗GEO卫星、3颗IGSO卫星和27颗MEO卫星的北斗卫星导航系统所能够提供的星座性能指标。初步分析表明北斗卫星导航系统能向全球用户提供理想的卫星可见数、PDOP值和定位精度,这些指标与GPS系统相一致。对于中国大陆区域内的用户来讲,由于有5颗GEO卫星和3颗IGSO卫星的增强作用,COMPASS系统所提供的性能指标明显优于GPS系统。  相似文献   

A New Data Processing Strategy for Huge GNSS Global Networks   总被引：2，自引：4，他引：2  

M. Ge  G. Gendt  G. Dick  F. P. Zhang  M. Rothacher 《Journal of Geodesy》2006,80(4):199-203

In Global Positioning System (GPS) data analyses, large networks are usually divided into sub-networks to solve the conflict between increasing amounts of data and limited computer resources, although an integrated analysis would provide better results. This conflict becomes even more critical with the increasing number of stations, and low-Earth-orbiting satellites and the Galileo system coming into operation. The major reason is that a huge number of ambiguity parameters are kept in the normal equation for sequential integer ambiguity fixing. In this paper, the problem is solved by a special procedure of parameter elimination for both real-valued and ambiguity-fixed solutions, based on an adapted ambiguity-fixing approach where the covariance-matrix of ambiguity parameters is not required anymore. It is demonstrated that, with the new strategy, the required memory can be reduced to one-tenth and the computation time to at least one-third compared to the existing methods, and huge GPS networks with several hundred stations can be processed efficiently on a personal computer.  相似文献   

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郭向  郭靖  张强  赵齐乐  陈国 《大地测量与地球动力学》2013,33(2):77-81

????PANDA??????GOCE????2009???????306-332??????????????????????????????????GOCE???????????PSO??????????PANDA????????????????????????????????α??????????SLR????????4??????????????????????????????????t????????????????GOCE????????????PSO??￡??侶?????????????????2 cm??  相似文献   

Resonant dynamics of Medium Earth Orbits: space debris issues     

Alessandro Rossi 《Celestial Mechanics and Dynamical Astronomy》2008,100(4):267-286

The Medium Earth Orbit region is the home of the navigation constellations. It is shown how the orbits of these constellations of satellites are strongly affected by the so-called inclination dependent luni-solar resonances. The analytical theory of these resonances is recalled and a large set of numerical integrations is used to investigate the stability of the orbits of the constellations over very long time spans. The stability issue is important in the definition of possible disposal strategies for the constellation spacecraft, after their end-of-life. Two possible disposal strategies are envisaged involving either stable or unstable orbits (from the eccentricity growth point of view). In particular it is shown how, to have disposal orbits with moderately short lifetime (of the orders of 40–50 years), a very large disposal maneuver would be required to rise the inital eccentricity to values above ~ 0.3.  相似文献   

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杨哲  戴吾蛟  余文坤  廖建平 《大地测量与地球动力学》2010,30(5):135-139

??????????·??Ч????????????????????GNSS???????????TEQC?????7??????????????????????????????????????????1???????????????????GNSS?????????????????????·??Ч??????????????????2????????????????????????????GNSS??????????????????????γ??????GNSS??????????С??3?????????????????Ч????λ??????????????????????,??????????????????????????????????  相似文献   

北斗卫星导航系统在地质调查领域应用综述   总被引：1，自引：0，他引：1  

温静  汪大明  孟月玥  方洪宾 《地质力学学报》2012,18(3):213-223

北斗卫星导航系统由中国自行研制,拥有完全自主知识产权,具有快速定位、双向通信和精密授时三大功能。介绍了北斗卫星导航系统的特点、功能及其在数据采集与监测、监控与指挥调度等方面的典型应用,总结了北斗卫星系统在野外地质调查与安全保障、地质灾害实时监测、抗震救灾与应急指挥中的应用,重点介绍了基于北斗卫星的野外地质调查服务与管理系统、滑坡实时监测系统、青藏高原地应力实时监测系统、抗震救灾应急指挥系统的组成及功能,并分析了北斗卫星导航系统在地质领域的应用优势。   相似文献   

捷联惯性导航系统重力扰动影响分析     

尧颖婷  沈晓蓉  邹尧  季海燕 《大地测量与地球动力学》2011,31(6):159-163

通过EGM2008地球重力场球谐模型生成某区域重力扰动图,建立重力扰动情况下捷联惯性导航系统误差模型,仿真验证重力扰动的水平分量对捷联惯性导航误差的影响,结果表明：重力扰动的水平分量引起的捷联惯性导航系统的水平位置与速度误差以舒拉周期进行振荡,重力扰动为12.5×10 ^-5 ms ^-2时,位置误差达160 m。  相似文献   

LABORATORY EXPERIMENTS ON NAVIGATION-INDUCED BED SHEAR STRESSES AND SEDIMENT RESUSPENSION     

M.H GARCIA  D.M. ADMIRAAL  J.F. RODRIGUEZ 《国际泥沙研究》1999,(2)

IINTRODUCTIONDependingonflowandoperatingconditions,navigationtrafficmaycausesignificantresuspensionofdepositedsediment.Jnanumberofsituationsresuspensionofdepositedsedimentcanhavesevereenvironmentalrepercussions.Forinstance,ifthesedimentcontainscontaminants,thecontaminantsmaybereentrainedwiththesediment,taintingthewaterquality(Erdmannetal.,1994).Inothersituations,..evedincreasesintheamountofcleansuspendedsedimentcanbedetrimentalforaquaticplantsandanimals(Garcfaetal.,1998).Inordertoassesst…  相似文献   

影像导航中的数据组织与索引   总被引：1，自引：0，他引：1  

李润生  朱述龙  曹闻 《测绘信息与工程》2010,35(6):12-14

分析了传统的影像管理技术在影像导航系统中使用的一些不足,提出了适合于影像导航系统的管理技术,并利用Visual Studio平台对其进行了实现。试验表明,此技术可以明显提高效率。  相似文献   

南海海区渔船无线电导航仪器选用浅见     

崔照明 《广东海洋大学学报》1991,(1)

本文分析了各种无线电导航设备的特性及其在南海海区应用的优劣,并考虑到GPS对导航领域的影响,根据南海区渔船的实际需要,提出了南海区渔船选择无线电导航仪器的意见,供各类渔船在选用无线电导航仪器时作参考。  相似文献