共查询到20条相似文献，搜索用时 234 毫秒
1.
2.
本文阐述武汉人卫站第三代卫星激光测距系统，包括硬件和软件，并介绍了１９９０年和１９９年的观测情况。从两年多的观测实践和国外返馈的结果可知：①武汉站第三代卫星激光测距系统能够观测所有带反射镜的激光卫星，具有一定的地影观测能力，单次测距精度为２－４ｃｍ；②实现了用微机进行实时跟踪控制；③研制的软件系统可以提高卫星位置预报精度、增强信噪分辨力、以及提高资料利用率。 相似文献
3.
4.
卫星激光测距技术是对空间目标进行高精度的距离测量,以获得星地间的距离。用此观测数据可以精确测定空间目标的运行轨道、解算全球地面测距站的地心坐标以及地球参数。北京房山人卫激光观测站在实现千赫兹测距系统改造升级的基础上,实现了对所有的高中低轨卫星观测并取得可观的高质量激光测距数据。由于天宫2号运行轨道低,目标运行速度快,导致天宫二号出现预报偏差比较大、伺服控制系统驱动能力偏低以及空间目标观测数据缺失等问题。通过北京房山人卫激光站对天宫2号准确的预报,成功获取天宫2号激光观测有效数据用以轨道检核,同时也为以后保质保量完成空间目标观测任务提供了坚实基础,也为即将开始的空间非合作目标的观测任务开启了一个良好开端。 相似文献
5.
阿根廷圣胡安激光测距系统的SLR数据质量分析 总被引：2，自引：1，他引：1
利用自行研制的激光定轨软件CASMORD分析阿根廷圣胡安激光测距系统的SLR数据质量.结果表明,阿根廷圣胡安激光测距系统性能良好,具有较小的系统偏差(距离偏差和时间偏差),系统偏差稳定,随时间的变化较小,有效观测圈数和数据观测量处于全球台站前列;经系统偏差修正后,该系统达到了亚厘米级观测水平,具有较高的观测精度,可以为卫星的精密定轨提供在我国本土无法观测的轨道弧段的资料,为我国科学研究和国家的特殊需要提供必须的宝贵资料. 相似文献
6.
7.
8.
9.
刘基余 《武汉大学学报(信息科学版)》2005,30(10):870-872,880
依据地月激光测距的成功实践和对卫星激光定轨的基础研究,提出了用地面对嫦娥卫星作激光测距的方法,高精度地测定嫦娥卫星绕月飞行时的实时在轨位置,论述了多站激光定轨和单站激光定轨的解算数模。 相似文献
10.
11.
12.
13.
A transportable lunar laser ranging station can be expected to measure the range to the lunar corner retroreflectors from
a site on the Earth's surface with an uncertainty of about 3 cms. The accuracy with which that station can infer its geocentric
position is influenced by many factors including the uncertainties in the pole position and rotation rate of the Earth and
the data loss due to weather.
The results of a simplified modelling study intended to include these factors are presented in cartographic form. The modelling
indicates that, assuming the successful operation of three or more widely separated fixed laser stations, the transportable
station will be able to determine its relative geocentric position in all three coordinates with an accuracy comparable to
the original range uncertainty. 相似文献
14.
Laser ranging to Starlette from April 1983 to April 1984 has been used to determine a coordinate set, UASC.ST1, of laser reference
points for 18 tracking stations. The coordinates were derived by application of the least-squares data reduction procedure
in a simultaneous solution along with geodynamic parameters for 49 near consecutive 5–6 day arcs. Comparisons with the University
of Texas station coordinates,LSC 8112 andLSC 8402, and theRGO, Herstmonceux, coordinates,RGOSC.LG2, reveal consistency to near 30 cm in each coordinate. Furthermore, the translation vectors of the comparisons are not significantly
different from zero indicating consistency in the implied origins of the systems.
The period of analysis included seven occasions in which STARLETTE was tracked near simultaneously by three or four laser
stations in North America. Using the short arcs as reference frameworks, station coordinates were determined by application
of two contrasting methods, namely, a multi-arc simultaneous analysis and a weighted mean of the individual pass solutions.
The former compared more favourably with baselines from the long-arc solution with anRMS error of near 16 cm. Comparison against theLSC 8402 coordinates confirmed that baselines accurate to within 15 cm can be achieved by satellite laser ranging to Starlette. 相似文献
15.
The paper presents the results of crustal deformation, as evidenced by changed station coordinates, in the Tokyo metropolitan area detected by the satellite laser ranging (SLR) technique. The coordinates of two Key Stone SLR stations, Tateyama and Kashima, were determined from 4 weeks of orbital arcs of the LAGEOS-1 and LAGEOS-2 satellites with respect to 16 SLR stations kept fixed in the ITRF2000 reference frame. The station coordinates were calculated using the NASA GEODYN-II orbital program. The orbital RMS-of-fit for both satellites was 16 mm. The standard deviation of the estimated positions was 3 mm. A jump of about 5 cm in the baseline length between the Kashima and Tateyama stations was detected in June–August 2000 by VLBI and GPS techniques. This work confirms this crustal deformation as determined by SLR and vice versa. Analysis of coordinates of these stations shows that this effect was caused by a 4.5-cm displacement of the Tateyama station in the north-east direction. The change in the vertical component was not significant. 相似文献
16.
针对北京市CORS站的稳定性问题,该文利用GAMIT/GLOBK软件对北京市13个CORS站2016—2018年的观测数据进行了处理,获取了原始坐标时间序列和坐标残差时间序列,通过极大似然估计的方法对CORS基准站进行了噪声模型分析和区域速度场估计。结果表明,北京市CORS站坐标时间序列的最佳噪声模型为WN+FN+RWN组合模型;采用NEU方向的最佳噪声组合模型对北京市CORS站进行区域速度场估计,BJTZ、CHAO、DSQI、XNJC站的沉降较为严重,其他CORS站N方向速度估值在7.2~14.3 mm/a,E方向速度估值在27.5~32.5 mm/a,U方向速度估值在2.0~8.5 mm/a。 相似文献
17.
北斗全球卫星导航系统（BDS-3）已经于2018年年底建成基本系统，并计划于2020年建成完整系统，而精确的卫星轨道是实现高性能全球服务的前提。本文基于北斗三号基本系统的18颗中圆轨道（MEO）卫星，评估了北斗三号卫星星间链路的测量噪声与测距精度，利用中国境内12个区域监测站的星地观测和星间链路观测，进行了联合卫星轨道测定试验，并与单纯区域监测站观测定轨结果进行了比较，分析了两种定轨模式重叠弧段轨道误差、轨道预报精度和激光检核精度。结果表明：北斗三号卫星的星间链路测量噪声为2.9 cm，测距精度约为4.4 cm；仅采用区域测站定轨，重叠弧段三维位置误差RMS为66.7 cm，加入星间链路后可降低至15.4 cm，提高了76.9%，24 h轨道预报位置精度也由114.1 cm提升至20.3 cm，提升了83.2%，激光检核径向精度为8.4 cm左右，明显优于北斗二号卫星轨道精度。 相似文献
18.
合理的参数估计及精度评定不仅需要可靠的函数模型，而且需要正确的随机模型。从权函数和粗差编辑两方面，研究了不同随机模型对西安流动卫星激光测距（satellite laser ranging，SLR）站坐标解算的影响，采用全球Lageos-1卫星观测数据计算了西安流动SLR站坐标。计算结果表明:①西安流动SLR站的观测精度和坐标解算精度均达到厘米级。②随机模型直接影响SLR站坐标的解算结果及可靠性；对于相同的计算弧段，抗差方差分量估计得到的站坐标精度最高、结果最稳定，残差加权均方差最小，观测资料利用率也最高；对于相同的计算方案，采用的SLR数据越多，坐标估计精度越高。 相似文献
19.
推导了一般情况下激光站为星载雷达高度计进行绝对定标的数学模型,并进行了仿真验证和误差分析,对高度计定标精度进行了定量评估。利用Corsica定标场区中Grasse激光站对Jason-2卫星定轨的实测数据进行了分析,取得了满意的结果。 相似文献
20.
介绍了GPS激光主动式定位系统的硬件组成及功能,分析了该方法定位的基本原理,并对试验结果进行了分析,验证该方法的可行性及定位精度。利用系统在不同的流动站对目标利用系统同轴望远镜进行照准,发射激光获取不同流动站的距离,利用数字罗盘获取激光仪的姿态,GPS_OEM获得流动站点的GPS坐标。利用空间距离交会原理解算目标的3维坐标,为不易到达的测区提供技术方法。 相似文献