共查询到16条相似文献，搜索用时 701 毫秒
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采用HY2A卫星2013年2月的实测数据,研究了GPS、星载多谱勒无线电定轨定位系统(DORIS)及卫星激光测距(SLR)三种观测数据的单独和联合定轨问题。通过与法国CNES的精密轨道数据比较发现:分别采用GPS、DORIS和SLR数据进行单独定轨,GPS数据确定轨道的径向平均精度为1.3cm,三维位置约为6.2cm;DORIS定轨的径向平均精度为1.6cm,比GPS结果略差;SLR确定轨道的径向平均精度为2.3cm。用GPS、DORIS和SLR三种数据联合定轨,确定轨道的径向平均精度为1.2cm,三维位置约为6.5cm。与星载GPS定轨结果比较,三种观测数据的联合定轨在提高卫星轨道确定精度上不明显,但联合定轨有利于保持计算轨道精度相对稳定。用站星间高度角大于60°的SLR数据检验GPS/DORIS联合确定的轨道,两者在测距方向的均方差为2.5cm,可见基于HY2A的观测数据可以实现cm级的定轨需求。 相似文献
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《测绘科学》2020,(1):42-47
针对JASON-3卫星精密定轨方法和轨道精度检核的关键问题,该文利用4d的星载GPS观测数据,基于简化动力学定轨方法实现JASON-3精密定轨,并提出采用内部符合和外部符合两种方法对解算轨道进行检核。通过重叠轨道对比,径向、切向和法向轨道精度均在0.5cm左右;将解算的简化动力学轨道与DORIS国际服务组织(IDS)的多任务精密卫星测高、卫星定轨和定位地面部分提供的SSA精密轨道进行对比,4d的轨道精度在径向、切向和法向分别达1.57～2.18cm、2.22～3.55cm和2.60～2.89cm。实验结果表明,JASON-3测高卫星的简化动力学轨道精度达厘米级,满足该卫星对轨道精度的要求。 相似文献
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以GRACE卫星为例,分析比较利用SLR观测资料进行卫星定轨时,采用不同大气密度模型对GRACE卫星定轨精度的影响;将定轨结果与采用GPS的定轨结果进行比较,分析与GPS定轨结果的差异。实验证明,大气密度模型的选择对定轨结果的影响很明显,同时,比较了基于SLR的定轨结果与采用GPS的定轨结果,发现大气密度模型采用DTM的情况与采用GPS的轨道差异最小,差异的量级为米级。 相似文献
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为了实现cm级HY-2卫星精密定轨,提出了基于DORIS和SLR的HY-2卫星综合定轨方法。模拟了DORIS信标站与SLR跟踪站的观测数据,确定了定轨方法和流程,探讨了分别赋予不同观测精度时各定轨精度,并分别分析了不同的信标站分布以及两种观测技术综合精密定轨中权对定轨精度的影响。实验表明,观测精度的高低直接影响着单一技术的定轨精度;优化信标站的分布,可明显提高定轨精度并节约计算时间;多种技术综合定轨时,合理分配各观测量的权可使定轨精度达到最佳;分别赋予DORIS和SLR观测量0.3mm/s和10mm的权,则使HY-2卫星定轨精度达到cm级。 相似文献
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采用2015年5月24日—30日的Swarm星载GPS双频观测数据,基于Melbourne-Wübbena(MW)和消电离层线性组合,在精密单点定位技术的基础上,采用批处理最小二乘估计法对不同轨道高度的Swarm系列卫星进行非差运动学精密定轨。利用星载GPS相位观测值残差、与欧空局发布的简化动力学轨道对比,以及SLR检核3种方法对Swarm系列卫星非差运动学定轨结果进行精度评估。结果表明:①Swarm系列卫星星载GPS相位观测值残差RMS为6~7 mm;②与欧空局发布的简化动力学轨道进行求差,径向、切向及法向轨道差值RMS为2~4 cm;③与欧空局发布的运动学轨道进行求差,径向、切向及法向轨道差值RMS为1~2 cm;④SLR检核结果表明Swarm-A/B/C卫星轨道精度为3~4 cm。因此,采用非差运动学定轨方法与本文提供的定轨策略进行Swarm系列卫星精密定轨是切实可行的,定轨精度为厘米级。 相似文献
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Swarm星座是ESA的首个用于测量来自地球核心、地幔、地壳、海洋、电离层等区域磁场信息的对地观测卫星星座。而高精度的轨道信息正是其有效利用卫星载荷完成上述任务的前提条件。目前国内关于Swarm卫星精密定轨的研究较少,为此建立并推导了Swarm卫星精密定轨的动力学模型、观测模型以及它们之间的数学关系,详细给出了Swarm卫星精密定轨模型与实现过程。针对Swarm卫星精密定轨中姿态数据的处理问题提出了相应的解决方案。利用Swarm卫星星载GPS实测数据,采用约化动力学定轨方法进行Swarm卫星精密定轨实验。通过轨道衔接点位置差异、与外部精密轨道比较以及SLR验证等精度评定方法分析表明:基于星载GPS的Swarm卫星约化动力学定轨各方向的精度都优于3 cm。 相似文献
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Jason-2卫星星载GPS数据cm级精密定轨 总被引：1，自引：0，他引：1
Jason-2卫星为测高卫星,需要cm级的轨道精度。利用Jason-2星载GPS数据,采用简化动力学法进行了Jason-2卫星精密定轨。对简化动力学轨道进行重叠轨道对比,径向精度达到1.19cm;与CLASS提供的POE结果对比,径向精度达到5.54cm;与SLR数据进行对比,整体精度达到6.63cm。因此,简化动力学轨道达到了cm级要求,定轨精度良好。 相似文献
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利用Jason-3星载GPS观测数据,采用简化动力学方法和运动学方法对Jason-3卫星进行精密定轨研究. 通过载波相位残差、重叠轨道对比、参考轨道对比和卫星激光测距(SLR)轨道检核四种方式评定轨道精度. 计算相位残差均方根(RMS)值,简化动力学轨道的RMS值在0.7～0.8 cm,运动学轨道的RMS值在0.50～0.55 cm;简化动力学轨道重叠部分径向RMS值达到0.32 cm,运动学轨道重叠部分径向RMS值达到1.12 cm;与国际DORIS服务(IDS)官方提供的参考轨道对比,简化动力学轨道径向精度达到1.47 cm,运动学轨道径向精度达到4.36 cm;利用SLR观测数据进行核验,简化动力学轨道精度整体优于2.1 cm,运动学轨道精度整体优于3.3 cm. 通过实验证明:Jason-3卫星的简化动力学轨道和运动学轨道的精度均达到cm级. 相似文献
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TOPEX/Poseidon orbit error assessment 总被引：1，自引：0，他引：1
A. J. E. Smith E. T. Hesper D. C. Kuijper G. J. Mets P. N. A. M. Visser B. A. C. Ambrosius K. F. Wakker 《Journal of Geodesy》1996,70(9):546-553
This paper discusses the accuracy of TOPEX/Poseidon orbits computed at Delft University, Section Space Research & Technology (DUT/SSR&T), from several types of tracking data,i.e. SLR, DORIS, and GPS. To quantify the orbit error, three schemes are presented. The first scheme relies on the direct altimeter observations and the covariance of the JGM-2 gravity field. The second scheme is based on crossover difference residuals while the third scheme uses the differences of dynamic orbit solutions with the GPS reduced-dynamic orbit. All three schemes give comparable results and indicate that the radial orbit error of TOPEX/Poseidon is 3–4 cm. From the orbit comparisons with GPS reduced dynamic, both the along-track and cross-track errors of the dynamic orbit solutions were found to be within 10–15 cm. 相似文献
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针对北斗导航卫星系统首创的GEO+IGSO+MEO混合星座设计,本文研究了根据不同星座,采取不同约束条件和数据处理策略的北斗卫星精密定轨方法,提出了一种针对北斗系统混合星座的分层约束精密定轨方案。该方案首先将北斗卫星分为非GEO(IGSO/MEO)和GEO两部分进行解算,利用GPS解算的公共参数对北斗IGSO/MEO精密定轨形成有效约束,然后固定GPS和北斗IGSO/MEO解算结果,最后单独对北斗GEO卫星进行强约束下的轨道解算。利用实测数据进行了精密定轨试验,试验结果表明:采用本文提出的方法,北斗GEO卫星和非GEO卫星三维重叠弧段轨道精度分别为0.688 m和0.042 m,比传统方法分别提高了54.2%和72.4%。另外,采用激光测距检核和测站坐标静态精密单点定位的方法对轨道精度进行了验证,激光检核精度提高了44.3%,测站坐标在水平和高程方向上精度分别平均提升了21.5%和20.7%。 相似文献
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The DORIS Doppler measurements collected by Jason-1 are abnormally perturbed by the influence of the South Atlantic Anomaly (SAA). The DORIS ultra-stable oscillators on-board Jason-1 are not as stable as they should be; their frequency is sensitive both to the irradiation rate and to the total irradiation encountered in orbit. The consequence is that not only are the DORIS measurement residuals higher than they ought to be, but also large systematic positioning errors are introduced for stations located in the vicinity of the SAA. In this paper, we present a method that has been devised to obtain a continuous observation of Jason-1 frequency offsets. This method relies on the precise determination of the station frequency and troposphere parameters via the use of other DORIS satellites. More than 3 years of these observations have then been used to construct a model of response of the oscillators of Jason-1 to the SAA. The sensitivity of the Jason-1 oscillators to the SAA perturbations has evolved over time, multiplied by a factor of four between launch and mid-2004. The corrective performances of the model are discussed in terms of DORIS measurement residuals, precise orbit determination and station positioning. The average DORIS measurement residuals are decreased by more than 7 % using this model. In terms of precise orbit determination, the 3D DORIS-only orbit error decreases from 5 to 4.2 cm, but the DORIS+SLR orbit error is almost unaffected, due to the already good quality of this type of orbit. In terms of station positioning, the model brings down the average 3D mono-satellite monthly network solution discrepancy with the International Terrestrial Reference Frame ITRF2000 from 11.3 to 6.1 cm, and also decreases the scatter about that average from 11.3 to 3.7 cm. The conclusion is that, with this model, it is possible to re-incorporate Jason-1 in the multi-satellite geodetic solutions for the DORIS station network. 相似文献
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Stavros A. Melachroinos Frank G. Lemoine Douglas S. Chinn Nikita P. Zelensky Joseph B. Nicholas Brian D. Beckley 《GPS Solutions》2014,18(4):497-507
We examine the impact of using seasonal and long-period time-variable gravity field (TVG) models on GPS orbit determination, through simulations from 1994 to 2012. The models of time-variable gravity that we test include the GRGS release RL02 GRACE-derived 10-day gravity field models up to degree and order 20 (grgs20x20), a 4 × 4 series of weekly coefficients using GGM03S as a base derived from SLR and DORIS tracking to 11 satellites (tvg4x4), and a harmonic fit to the above 4 × 4 SLR–DORIS time series (goco2s_fit2). These detailed models are compared to GPS orbit simulations using a reference model (stdtvg) based on the International Earth Rotation Service (IERS) and International GNSS Service (IGS) repro1 standards. We find that the new TVG modeling produces significant along, cross-track orbit differences as well as annual, semi-annual, draconitic and long-period effects in the Helmert translation parameters (Tx, Ty, Tz) of the GPS orbits with magnitudes of several mm. We show that the simplistic TVG modeling approach used by all of the IGS Analysis Centers, which is based on the models provided by the IERS standards, becomes progressively less adequate following 2006 when compared to the seasonal and long-period TVG models. 相似文献