Laser-based validation of GLONASS orbits by short-arc technique   总被引：1，自引：0，他引：1  

F. Barlier  C. Berger  P. Bonnefond  P. Exertier  O. Laurain  J. F. Mangin  J. M. Torre 《Journal of Geodesy》2001,75(11):600-612

 The International GLONASS Experiment (IGEX-98) was carried out between 19 October 1998 and 19 April 1999. Among several objectives was the precise orbit determination of GPS and GLONASS satellites and its validation by laser ranging observations. Local laser-based orbit corrections (radial, tangential and normal components in a rotating orbital local reference frame) are computed using a geometrical short-arc technique. The order of magnitude of these corrections is at the level of few decimeters, depending on the considered components. The orbit corrections are analyzed as a function of several parameters (date, orbital plane, geographical area). The mean corrections are at the level of several centimeters. However, when averaging over the entire campaign and for all the satellites, no mean radial, tangential and normal orbit corrections are found. The origin of the observed corrections is considered (errors due to the geocentric gravitational constant, the non-gravitational forces, the thermal equilibrium of on-board equipment, the reference systems, the location and the signature of the retroreflector array, and the precision of the satellite laser ranges). Some features are also due to errors in the radio-tracking GLONASS orbits. Further investigations will be needed to better understand the origin of various biases. Received: 17 February 2000 / Accepted: 31 January 2001  相似文献   

COMBINED GPS/GLONASS PRECISE POSITIONING FOR LONG-DISTANCE BASELINES     

HU Guorong CUI Weihong 《地球空间信息科学学报》2001,4(1):24-27

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｃｏｍｂｉｎｅｄＧＰＳ/ＧＬＯＮＡＳＳｏｆｆｅｒｓｍａｎｙａｄ ｖａｎｔａｇｅｓｃｏｍｐａｒｅｄｗｉｔｈＧＰＳ＿ｏｎｌｙｕｓｅｆｏｒｐｏｓｉｔｉｏｎ ｉｎｇａｐｐｌｉｃａｔｉｏｎｓｅｓｐｅｃｉａｌｌｙｉｎａｒｅａｓｗｈｅｒｅｔｈｅｎｕｍ ｂｅｒｏｆｖｉｓｉｂｌｅｓａｔｅｌｌｉｔｅｓｉｓｌｉｍｉｔｅｄ .ＴｈｅｉｎｃｌｕｓｉｏｎｏｆｔｈｅＧＬＯＮＡＳＳｓｉｇｎａｌｓｃａｎｉｎｃｒｅａｓｅｔｈｅａｃｃｕｒａｃｙｏｆｐｏｓｉｔｉｏｎｉｎｇａｓｗｅｌｌａｓｔｈｅａｖａｉｌａｂ…  相似文献   

PERFORMANCE ANALYSIS OF INTEGRATED GPS/GLONASS CARRIER PHASE-BASED POSITIONING   总被引：2，自引：0，他引：2  

DAI LiwenHAN ShaoweiChris Rizos 《地球空间信息科学学报》2001,4(4):9-18

1　ＩｎｔｒｏｄｕｃｔｉｏｎＲｅａｌ＿ｔｉｍｅｋｉｎｅｍａｔｉｃＧＰＳｐｒｅｃｉｓｅｐｏｓｉｔｉｏｎｉｎｇｈａｓｂｅｅｎｐｌａｙｉｎｇａｎｉｎｃｒｅａｓｉｎｇｒｏｌｅｉｎｂｏｔｈｓｕｒｖｅｙｉｎｇａｎｄｎａｖｉｇａｔｉｏｎ ,ａｎｄｈａｓｂｅｃｏｍｅａｎｅｓｓｅｎｔｉａｌｔｏｏｌｆｏｒｐｒｅｃｉｓｅｒｅｌａｔｉｖｅｐｏｓｉｔｉｏｎｉｎｇ .Ｈｏｗｅｖｅｒ,ｒｅｌｉａｂｌｅａｎｄｃｏｒｒｅｃｔａｍｂｉｇｕｉｔｙｒｅｓｏｌｕｔｉｏｎｄｅｐｅｎｄｓｏｎｏｂｓｅｒｖａ ｔｉｏｎｓｕｐｏｎａｌａｒｇｅｎｕｍｂｅ…  相似文献   

Sensitivity of GPS and GLONASS orbits with respect to resonant geopotential parameters     

D. Ineichen  G. Beutler  U. Hugentobler 《Journal of Geodesy》2003,77(7-8):478-486

The Center for Orbit Determination in Europe (CODE) has been involved in the processing of combined GPS/GLONASS data during the International GLONASS Experiment (IGEX). The resulting precise orbits were analyzed using the program SORBDT. Introducing one satellites positions as pseudo-observations, the program is capable of fitting orbital arcs through these positions using an orbit improvement procedure based on the numerical integration of the satellites orbit and its partial derivative with respect to the orbit parameters. For this study, the program was enhanced to estimate selected parameters of the Earths gravity field. The orbital periods of the GPS satellites are —in contrast to those of the GLONASS satellites – 2:1 commensurable (P _Sid:P _GPS) with the rotation period of the Earth. Therefore, resonance effects of the satellite motion with terms of the geopotential occur and they influence the estimation of these parameters. A sensitivity study of the GPS and GLONASS orbits with respect to the geopotential coefficients reveals that the correlations between different geopotential coefficients and the correlations of geopotential coefficients with other orbit parameters, in particular with solar radiation pressure parameters, are the crucial issues in this context. The estimation of the resonant geopotential terms is, in the case of GPS, hindered by correlations with the simultaneously estimated radiation pressure parameters. In the GLONASS case, arc lengths of several days allow the decorrelation of the two parameter types. The formal errors of the estimates based on the GLONASS orbits are a factor of 5 to 10 smaller for all resonant terms. AcknowledgmentsThe authors would like to thank all the organizations involved in the IGS and the IGEX campaign, in particular those operating an IGS or IGEX observation site and providing the indispensable data for precise orbit determination.  相似文献   

全球导航卫星系统的现代化进展   总被引：8，自引：0，他引：8  

王晓明  殷耀国  杨自明 《全球定位系统》2006,31(4):39-42

无论从技术角度、经济角度、还是从战略角度出发，卫星导航定位系统都具有极高的研究及应用价值。文章重点围绕国外三大导航卫星定位系统及国内北斗星导航定位系统的体系结构、服务内容、现代化进展及其相互异同；阐述了发展卫星导航定位系统对我国的重大意义；提出了我国面临这一高新技术浪潮急需采取的战略举措。  相似文献   

GLONASS卫星位置的动力学改进算法     

陈刘成  韩春好  唐波 《测绘科学》2007,32(4):8-9,31

为了减弱由于广播星历拟合引起的误差,本文提出了一种基于动力学轨道改进的GLONASS卫星位置算法。该算法仅采用GLONASS广播星历信息就能够提高GLONASS卫星位置坐标的计算精度。算例表明,该方法能够有效减弱GLONASS卫星广播星历的拟合误差,卫星位置的精度损失从0.5m降到mm级;外推2-3h,精度损失也仅在cm级水平。  相似文献   

导航卫星天线相位中心误差标定方法研究现状及发展趋势   总被引：1，自引：0，他引：1  

刘伟平  郝金明  邓科 《测绘通报》2018,(3):1-8

卫星天线相位中心误差是影响GNSS高精度定位定轨的重要误差源,实用中需要对其精确标定。随着北斗卫星导航系统的建设发展,如何对卫星天线相位中心误差进行更为精确的标定应引起人们的重视。为此,本文首先简要介绍了各卫星导航系统的卫星天线情况,而后系统总结了导航卫星天线相位中心误差标定方法的发展历程和研究现状,指出了未来卫星天线相位中心误差标定方法的发展趋势,相关研究成果对我国北斗卫星天线相位中心误差的标定方法研究具有参考意义。  相似文献   

BDS/GPS/GLONASS RTK定位算法研究     

王艺希  秘金钟  徐彦田  王铎 《测绘通报》2018,(3):9-13

实现了BDS/GPS/GLONASS三系统组合RTK定位算法,介绍了BDS/GPS/GLONASS三系统组合RTK数学模型,解决了多模融合导航定位时空基准统一问题,并针对附加模糊度参数的卡尔曼滤波函数模型,提出了一种确定实时动态定位中卡尔曼滤波参数的方法。编制了BDS/GPS/GLONASS RTK定位程序,并对28 m超短基线及31 km短基线实测数据进行了解算。对比分析了BDS、GPS、GLONASS、BDS/GPS、BDS/GLONASS、GPS/GLONASS、BDS/GPS/GLONASS七种模式下的定位结果。  相似文献   

BeiDou、Galileo、GLONASS、GPS多系统融合精密单点   总被引：2，自引：1，他引：1  

任晓东  张柯柯  李星星  张小红 《测绘学报》2015,44(12):1307-1313

随着中国BeiDou系统与欧盟Galileo系统的出现以及俄罗斯GLONASS系统的恢复完善,过去单一的GPS导航卫星系统时代已经逐步过渡为多系统并存且相互兼容的全球性卫星导航系统(multi-constellation global navigation satellite systems,multi-GNSS)时代,多系统GNSS融合精密定位将成为未来GNSS精密定位技术的发展趋势。本文采用GPS、GLONASS、BeiDou、Galileo 4大卫星导航定位系统融合的精密单点定位(precise point positioning,PPP)实测数据,初步研究并分析了4系统融合PPP的定位性能。试验结果表明:在单系统观测几何构型不理想的区域,多系统融合能显著提高PPP的定位精度和收敛速度。4大系统融合的PPP收敛速度相对于单GNSS可提高30%~50%,定位精度可提高10%~30%,特别是对高程方向的贡献更为明显。此外,在卫星截止高度角大于30°的观测环境下,单系统由于可见卫星数不足导致无法连续定位,而多系统融合仍然可以获得PPP定位结果,尤其是水平方向具有较高的定位精度。这对于山区、城市以及遮挡严重的区域具有非常重要的应用价值。  相似文献   

Helmert验后方差估计在GPS/GLONASS组合单点定位中的应用     

周海涛  袁新英  罗力 《测绘与空间地理信息》2015,(4):153-155

在给出组合GPS/GLONASS单点定位原理后,提出了利用Helmert验后方差估计法对GPS/GLONASS观测值定权的方法,并结合应用实例,通过对比分析说明该方法的可行性,实践表明该方法定权比采用固定权或经验定权更具有合理性。  相似文献