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| 1 | Multipath error detection and correction for GEO/IGSO satellites显示文摘Constellations of regional satellite navigation systems are usually constituted of geostationary satellites (GEO) and inclined geostationary satellites (IGSO) for better service availability. Analysis of real data shows that the pseudorange measurements of these two types of satellites contain significant multipath errors and code noise, and the multipath for GEO is extremely serious, which is harmful to system services. In contrast, multipath error of carrier phase measurements is less than 3 cm, which is smaller than the multipath of pseudorange measurements by two orders of magnitude. Using a particular combination of pseudorange and dual-frequency carrier phase measurements, the pseudorange multipath errors are detected, and their time varying features are analyzed. A real-time multipath correction algorithm is proposed in this paper, which is called CNMC (Code Noise and Multipath Correction). The algorithm decreases the influence of the multipath error and therefore ensures the performance of the system. Data processing experiments show that the multipath error level may be reduced from 0.5 m to 0.15 m by using this algorithm, and 60% of GEO multipath errors and 42% of IGSO multipath errors are successfully corrected with CNMC. Positioning experiments are performed with a constellation of 3 GEO plus 3 IGSO satellites. For dual-frequency users the East-West position accuracy is improved from 1.31 m to 0.94 m by using the CNMC algorithm, the South-North position accuracy is improved from 2.62 m to 2.29 m, and the vertical position accuracy is improved from 4.25 m to 3.05 m. After correcting multipath errors, the three-dimensional position accuracy is improved from 5.16 m to 3.94 m. | WU XiaoLi ZHOU JianHua WANG Gang HU XiaoGong CAO YueLing | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，7： | 31 |
| 2 | Positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS显示文摘Determined to become a new member of the well-established GNSS family,COMPASS(or BeiDou-2) is developing its capabilities to provide high accuracy positioning services.Two positioning modes are investigated in this study to assess the positioning accuracy of COMPASS' 4GEO/5IGSO/2MEO constellation.Precise Point Positioning(PPP) for geodetic users and real-time positioning for common navigation users are utilized.To evaluate PPP accuracy,coordinate time series repeatability and discrepancies with GPS' precise positioning are computed.Experiments show that COMPASS PPP repeatability for the east,north and up components of a receiver within China's Mainland is better than 2 cm,2 cm and 5 cm,respectively.Apparent systematic offsets of several centimeters exist between COMPASS precise positioning and GPS precise positioning,indicating errors remaining in the treatments of COMPASS measurement and dynamic models and reference frame differences existing between two systems.For common positioning users,COMPASS provides both open and authorized services with rapid differential corrections and integrity information available to authorized users.Our assessment shows that in open service positioning accuracy of dual-frequency and single-frequency users is about 5 m and 6 m(RMS),respectively,which may be improved to about 3 m and 4 m(RMS) with the addition of differential corrections.Less accurate Signal In Space User Ranging Error(SIS URE) and Geometric Dilution of Precision(GDOP) contribute to the relatively inferior accuracy of COMPASS as compared to GPS.Since the deployment of the remaining 1 GEO and 2 MEO is not able to significantly improve GDOP,the performance gap could only be overcome either by the use of differential corrections or improvement of the SIS URE,or both. | ZHOU ShanShi CAO YueLing ZHOU JianHua HU XiaoGong TANG ChengPan LIU Li GUO Rui HE Feng CHEN JunPing WU Bin | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，12： | 31 |
| 3 | 利用星间双向测距数据进行北斗卫星集中式自主定轨的初步结果分析显示文摘自主定轨是导航卫星自主导航的重要任务,是指在地面运行控制系统不可用的情形下,利用星间测距维持导航系统星历的自主更新.本文利用北斗新一代导航试验卫星搭载的Ka波段星间双向测距数据,进行集中式自主定轨试验.首先给出了星间双向测距数据的处理流程和数学模型,并分析了星间双向测距数据的测量特性.结果表明星间双向测距数据是一种高精度的距离测量.将星间双向测距数据用于定轨处理,残差标准差小于1 0 cm,均值好于1.0 cm,解算的设备零值稳定度好于0.2 ns.分别利用重叠弧段比较、用户等效距离误差评估和激光残差等方式评估了自主定轨的精度.结果表明,在一个地面锚固站支持下,自主定轨得到的卫星轨道径向重叠弧段互差优于6 cm,预报2 4 h径向重叠弧段互差优于1 0 cm.2 4 h预报轨道用户等效距离误差为0.4 3 m,优于L波段预报轨道的0.76 m,激光残差优于1 0 cm.星间链路对地观测为自主定轨提供空间基准,避免星座的整体旋转.本文讨论对地测量时长对自主定轨的影响.结果表明即使星间链路对地观测的截止高度角为60°,自主定轨结果和2 4 h预报轨道径向误差优于10 cm,三维位置优于1.5 m. | 唐成盼 胡小工 周善石 潘军洋 郭睿 胡光明 朱陵凤 李晓杰 吴杉 王琰 | 2017 | 中国科学:物理学、力学、天文学2017，47，2： | 26 |
| 4 | 2013—2015年BDS空间信号测距误差的精度评估显示文摘基于武汉大学发布的精密星历,计算2013年1月至2015年9月北斗广播星历的轨道、钟差和空间信号测距误差,并对其进行统计分析评估。结果表明:北斗卫星的径向精度总体上优于0.7 m、法向精度总体上优于1.4 m,且无明显的长期变化趋势;在切向精度上,倾斜地球同步轨道和中轨道优于2.1 m,高轨道的切向精度已从14 m左右提升至8 m左右;北斗高轨道、倾斜地球同步轨道、中轨道的钟差精度分别为6.3 ns,4.7 ns,4.3 ns;所有卫星的钟差精度总体上优于6 ns;所有卫星的空间信号误差精度总体上优于2 m,从长期来看,中轨道卫星的空间信号误差精度较为稳定;倾斜地球同步轨道和高轨道卫星的空间信号误差精度存在一定的波动。 | 刘万科 任杰 曾琪 吴云 楼益栋 | 2016 | 国防科技大学学报2016，38，3： | 22 |
| 5 | 多星定轨条件下北斗卫星钟差的周期性变化显示文摘基于地面监测网的多星精密定轨可以同时解算出北斗卫星轨道和卫星钟差。由于轨道和钟差的耦合影响,卫星钟差时序难免会出现周期性波动。此外,受限于目前并不完善的北斗全球监测网络分布、系统导航文件缺失以及定轨后处理软件的设置问题,3类卫星的钟差均存在大量数据间断问题。本文利用适用于间断数据的谱分析方法,对多星定轨条件下的北斗卫星钟差数据进行了周期项提取,并利用周期项改进后的钟差预报模型评估了24h以内的预报精度。基于近一年的数据分析表明,北斗GEO卫星钟差3个主周期依次为12、24和8h,IGSO卫星钟差的3个主周期依次为24、12和8h,而MEO卫星钟差的3个主周期依次为12.91、6.44和24h。与改进前相比,周期项改进后的钟差预报模型将北斗卫星钟差在24h以内的预报精度提高了20%~40%。 | 周佩元 杜兰 路余 方善传 张中凯 杨力 | 2015 | 测绘学报2015，44，12： | 21 |
| 6 | The wide-area difference system for the regional satellite navigation system of COMPASS显示文摘The regional satellite navigation system of COMPASS (Phase I) provides both open services and authorized services. Authorized services offer differential corrections and integrity information to users to support higher positioning, navigation and timing precision. Experimenting with real data, positioning accuracy is estimated with a 3GEO/4IGSO COMPASS constellation. The results show that with dual-frequency and single-frequency pseudo-range measurements, the positioning errors are respectively 8 and 10 m (RMS) for open service users, while for authorized users, the errors are 4 and 5 m (RMS), respectively. The COMPASS constellation geometry may cause large error to occur in the height component by 7-9 m for dualor single-frequency users, which can be effectively reduced with the differential corrections supplied by the authorized services. Multipath errors are identified and corrected for COMPASS, resulting in 25% positioning accuracy improvement for dual-frequency users and 10% improvement for single-frequency users. | CAO YueLing HU XiaoGong WU Bin ZHOU ShanShi LIU Li SU RanRan CHANG ZhiQiao HE Feng ZHOU JianHua | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，7： | 21 |
| 7 | GEO卫星区域电离层监测分析显示文摘由于GEO卫星的静地特性,由双频观测数据获取的穿刺点垂直总电子含量(VTEC)可以充分反映电离层的时域变化,而根据地面监测站的分布,可以进一步获取VTEC的空域变化。分析根据区域卫星导航系统观测数据计算VTEC的精度,理论分析表明VTEC精度优于2 TECU。根据实测数据计算分析我国高、中、低纬度不同穿刺点电离层平时、磁暴期间的周日变化特性和2011年全年变化特性,并与IGS全球电离层图(GIM)的穿刺点插值结果进行分析比较。结果表明,两者在电离层周日和全年变化趋势上具有很好的一致性,但磁暴期间我国低纬度地区GIM误差的峰值可达29TECU,2011年全年评估结果 GIM误差标准差为2~8 TECU。根据2011年的观测结果,电离层VTEC呈现出明显的半年异常现象。区域卫星导航系统为我国的电离层监测尤其是空间天气期间的电离层监测提供了新的支持。 | 吴晓莉 韩春好 平劲松 | 2013 | 测绘学报2013，42，1： | 18 |
| 8 | 北斗卫星导航系统精密定轨和广播星历轨道精度分析显示文摘为了分析北斗卫星导航系统导航定位服务能力,基于2013年国际GNSS服务组织(International GNSS Service,IGS)多GNSS试验(Multi-GNSSExperiment,M-GEX)、荷兰辉固公司(Furgo)、武汉大学北斗试验跟踪网(BeiDou Experiment Tracking System,BETS)和国际激光服务组织(International Laser Ranging Service,ILRS)等4个跟踪网观测数据,首先进行卫星精密定轨及精度评定,然后采用与事后精密轨道比较、激光检核等方式进行广播星历轨道精度评定,最后分析广播星历轨道对用户定位的影响.结果表明:基于载波相位观测数据的北斗地球静止卫星(Geostationary Earth Orbit,GEO)卫星精密定轨中切向分量存在1~4m级的常偏量误差,而基于时间比对和平滑伪距观测数据的广播星历切向分量没有这一现象;北斗卫星精密定轨径向、法向精度分别可以达到0.1m和0.2m;广播星历径向、法向精度分别为0.5m和1m 左右,轨道引起的用户测距误差(User Range Error,URE)平均为0.57m. | 耿涛 苏醒 许小龙 徐夏炎 | 2015 | 中国科技论文2015，10，9： | 17 |
| 9 | 综合伪距相位观测的北斗导航系统广域差分模型显示文摘我国区域北斗卫星导航系统为用户提供开放服务和授权服务两种服务方式,其中授权服务主要提供一维等效钟差改正数和完好性信息,实现更高精度的服务性能。北斗卫星导航系统提供的实时差分信息是基于CNMC平滑后的伪距观测数据计算,其精度受到残余伪距噪声的限制。为提升系统广域差分服务性能,本文提出了一种广域差分新模型。该模型综合了伪距及相位观测数据,并新增了轨道改正数。模型中经相位平滑的伪距观测值用于定义钟差改正数和轨道改正数的基准,而相位历元间差分观测值用于计算约束差分改正数的高精度相对变化。论文分析了数据采样率、测站个数等因素对新模型的影响,并采用中国区域内的观测站数据对新模型进行精度验证。试验结果表明:(1)基于新广域差分模型的GEO卫星UDRE指标相对原有模型提升了27%,IGSO卫星指标提升了35%,MEO卫星指标提升了24%;(2)基于新的广域差分模型,用户在南北、东西、高程方向的伪距定位精度分别提升了23%、32%和52%,实现了北斗系统用户导航定位三维定位精度优于1m的指标。 | 陈俊平 杨赛男 周建华 曹月玲 张益泽 巩秀强 王君刚 | 2017 | 测绘学报2017，46，5： | 17 |
| 10 | 北斗新一代卫星时分体制星间链路测量的系统误差标定显示文摘北斗导航卫星系统BDS已在新一代试验卫星星座上成功实现了星间链路(ISL)相互伪距测量.对时分体制Ka频段星间钟差测量实测数据的分析表明,虽然星间钟差测量的随机误差水平达到了10 cm(RMS)水平,但其中仍包含显著的系统性测量误差.该系统误差严重影响了星间链路测量在星间时间同步和提升轨道精度等方面的应用.分析表明,该系统误差来源于星间链路信号收发设备的时延.该时延在地面环境难以标定,且地面标定值在卫星入轨和在轨工作期间受空间环境影响可能发生变化.本文利用BDS星地L双向时频传递设备采集的星地钟差数据,以及星间链路测量数据,对星间链路收发设备的组合时延进行最优估计.估计的具体策略是对任意一个卫星对,利用这两颗卫星的星地钟差数据以及星间链路数据,解算这两颗卫星星间链路设备的组合时延.对2IGSO/2MEO新一代试验卫星星座连续14 d的数据处理结果表明,每天对每颗卫星解算一组星间链路组合时延值,该时延值的时间序列具有较好的稳定性,其在14 d内的标准偏差小于0.3 ns.将获得的组合时延值应用于星间相对钟差的测量,星间链路对地数据测定钟差与星地L双向钟差测量结果得到的钟差具有较好的一致性,证明了组合时延的自洽性.结果表明,星间链路数据对MEO卫星境外弧段钟差预报精度提升尤为明显:钟差监测弧段提升达到全弧段的40%以上;卫星入境后,M1S预报误差从3.59降低至0.86 ns,M2S从1.94降低至0.57 ns. | 潘军洋 胡小工 唐成盼 周善石 李冉 朱陵凤 唐桂芬 胡光明 常志巧 吴杉 苏冉冉 | 2017 | 科学通报2017，62，23： | 14 |
| 11 | 北斗卫星导航系统精密定轨技术研究现状显示文摘北斗系统开通运行以来,无论是系统建设还是精密定轨技术均获得了长足发展。文中简要介绍了北斗系统目前的建设情况,总结梳理了北斗卫星精密定轨技术发展现状。在此基础上,分析论述了北斗系统精密定轨中亟待解决的主要问题。 | 郝金明 刘伟平 杨力 李建文 吕志伟 | 2015 | 测绘科学技术学报2015，32，3： | 13 |
| 12 | 空间信号误差对北斗单向授时的影响显示文摘北斗卫星广播星历是影响授时服务的主要误差源,分析它的精度是非常必要的。分析了空间信号误差的主要组成星历误差和星钟误差的计算方法,并阐述了计算过程中应注意的问题:参考时间尺度不一致、坐标系不一致和卫星位置参考点不一致。以IGS分析中心GFZ提供的事后精密星历为参考,利用北斗卫星广播星历分析了空间信号误差对北斗单向授时的影响。结果表明,空间信号误差对北斗单向授时的影响随机波动在7 ns以内,由于不同北斗卫星对应的星钟误差中存在大小不等的系统误差,导致星钟误差对单向授时结果的影响大于星历误差。 | 李丹丹 许龙霞 李博 李孝辉 | 2017 | 电子测量与仪器学报2017，31，10： | 11 |
| 13 | 风云3C增强北斗定轨试验结果与分析显示文摘首次搭载GPS/BDS双模接收机全球导航卫星掩星探测仪(GNOS)的风云三号C星于2013年9月23日的成功发射,为研究低轨卫星对BDS定轨增强提供了便利。本文首先对低轨卫星GNOS搭载的GPS/BDS双模接收机的观测数据进行统计,并分析了伪距测量精度。然后在全球测站、区域测站两种布局情况下,对无GNOS的BDS单系统定轨、无GNOS的GPS/BDS双系统定轨、有GNOS的BDS单系统定轨增强、有GNOS的GPS/BDS双系统定轨增强4种方案进行北斗轨道及钟差比较分析。结果表明,GNOS对北斗卫星轨道增强在全球测站下,GEO卫星切向精度提升最为显著,提升程度达60%,其次是法向和其他类型卫星切向,部分弧段个别GEO卫星径向精度稍有下降。双系统定轨增强中可视弧段钟差重叠精度RMS值有0.1ns量级改善。7个国内测站区域监测网的定轨试验中对轨道进行了预报,结果表明GNOS对北斗GEO卫星轨道预报精度切向提升达85%,其余方向及卫星有较大改善,平均21.7%。可视弧段钟差重叠精度RMS值有0.5ns量级改善。 | 曾添 隋立芬 贾小林 计国锋 张清华 | 2017 | 测绘学报2017，46，7： | 11 |
| 14 | 北斗卫星导航系统混合星座的光压摄动建模和精度分析显示文摘卫星帆板及本体受照情况变化复杂,导致卫星光压摄动力的变化难以准确模制,既是动力学定轨的最大误差源,也是定轨预报精度降低的主要原因。针对此问题,采用北斗地面系统的区域监测网数据,详细比较了3种主要的经验模型(T20模型、ECOM5参数模型、ECOM9参数模型)对不同卫星的适用性情况。结果显示,在春秋分前后,地球同步轨道(geosynchronous earth orbit,GEO)卫星使用ECOM9参数模型最好,其解算的卫星钟差与星地双向钟差的互差标准差优于2 ns;对于倾斜地球同步轨道(inclined geosynchronous satellite orbit,IGSO)卫星和中地球轨道(medium earth orbit,MEO)卫星,无论是在动偏期间还是姿态模式转换期间,T20模型表现出更好的适用性。不同于此前国内外学者的相关研究,试验表明,对BDS混合星座的不同类型卫星、同一卫星的不同时段,应采用不同的经验太阳光压模型,以获得更高的定轨和预报精度。 | 李冉 胡小工 唐成盼 周善石 潘军洋 刘利 李晓杰 | 2018 | 武汉大学学报(信息科学版)2018，43，7： | 10 |
| 15 | Results and Analyses of BDS Precise Orbit Determination with the Enhancement of Fengyun-3C显示文摘Global navigation satellite system occultation sounder (GNOS) Fengyun-3C was launched successfully on September 23, 2013, which carried GPS/BDS receiver for the first time. This provides the convenience to study the enhancement results of low earth orbiter satellite (LEO) to BDS precise orbit determination (POD). First the data characteristic and code observation noise of GNOS are analyzed. Then the enhancement experiments in the case of global and regional ground observation stations layout are processed with four POD schemes: BDS single system, GPS/BDS double system, BDS single system with GNOS observations, GPS/BDS double system with GNOS observations. The precision of BDS orbits and clocks are compared via overlapping arcs. Results show that in the case of global station layout the along directional precision of GEO satellite has the biggest improvement, with the improvement percentage 60%. Then the precision of cross direction and the along direction of remaining satellites shows the second biggest improvement. The orbit precision of BDS-only POD in part of observation arcs some satellite even suffers a slight decline. The root mean square (RMS) of overlapping clock difference of visible arcs in GPS/BDS POD experiments improves by 0.1 ns level. As to the experiments of regional station layout with 7 ground stations, the orbit and clock overlapping precision and orbit predicting precision are analyzed. Results show that the predicting precision of BDS GEO satellites in the along direction improves by 85%. The remaining also has a substantial improvement, with the average percentage 21.7%. RMS of overlapping clock difference of visible arcs improves by 0.5 ns level. | Tian ZENG Lifen SUI Xiaolin JIA Guofeng JI Qinghua ZHANG | 2019 | Journal of Geodesy and Geoinformation Science2019，2，3： | 9 |
| 16 | 北斗广域差分分区综合改正数定位性能分析显示文摘目前北斗广域分米级星基增强系统在钟差改正数、轨道改正数的基础上,提出了基于相位观测值的分区综合改正数,介绍了分区综合改正数的概念及单频、双频用户的使用方法与定位模型。利用中国范围不同地区的北斗观测数据和对应的分区综合改正信息,统计了单频和双频用户分区综合改正精密单点定位的精度,并对其收敛性进行了分析。通过与使用GFZ提供的北斗超快速精密星历的定位效果比较,验证了分区综合改正定位在实时定位中的优势。在此基础上进一步对中国范围内分区综合改正定位效果与分区中心距离的关系进行了分析,并对不同观测时间长度的定位效果进行比较。结果表明,经分区综合改正后的双频用户平均25 min内动态定位三维误差能收敛至0.5 m以内,收敛后的定位精度为水平0.15 m,高程0.2 m;单频用户平均20 min内动态定位三维误差能收敛至0.8 m以内,收敛后的定位精度为水平0.3 m,高程0.5 m。随着用户站距离分区中心越远,定位效果总体呈现变差的趋势。总体上,当用户在分区中心1 000 km范围内时,北斗广域分区综合改正数将能提供实时分米级定位服务。 | 张益泽 陈俊平 杨赛男 陈倩 | 2019 | 武汉大学学报(信息科学版)2019，44，2： | 8 |
| 17 | Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox显示文摘Geostationary(GEO) satellites form an indispensable component of the constellation of Beidou navigation system(BDS). The ephemerides, or predicted orbits of these GEO satellites(GEOs), are broadcast to positioning, navigation, and timing users. User equivalent ranging error(UERE) based on broadcast message is better than 1.5 m(root formal errors: RMS) for GEO satellites. However, monitoring of UERE indicates that the orbital prediction precision is significantly degraded when the Sun is close to the Earth's equatorial plane(or near spring or autumn Equinox). Error source analysis shows that the complicated solar radiation pressure on satellite buses and the simple box-wing model maybe the major contributor to the deterioration of orbital precision. With the aid of BDS' two-way frequency and time transfer between the GEOs and Beidou time(BDT, that is maintained at the master control station), we propose a new orbit determination strategy, namely three-step approach of the multi-satellite precise orbit determination(MPOD). Pseudo-range(carrier phase) data are transformed to geometric range(biased geometric range) data without clock offsets; and reasonable empirical acceleration parameters are estimated along with orbital elements to account for the error in solar radiation pressure modeling. Experiments with Beidou data show that using the proposed approach, the GEOs' UERE when near the autumn Equinox of 2012 can be improved to 1.3 m from 2.5 m(RMS), and the probability of user equivalent range error(UERE)<2.0 m can be improved from 50% to above 85%. | LI XiaoJie ZHOU JianHua HU XiaoGong LIU Li GUO Rui ZHOU ShanShi | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，8： | 8 |
| 18 | 北斗伪距多路径分析及单点定位解算显示文摘文中利用北京站实测数据开展相关数据质量分析,利用改进后的Sky plot软件,MATLAB编制的程序计算、绘图,直观反映出GEO、IGSO和MEO卫星高度角、方位角以及伪距多路径误差,通过分析得出它们之间的相关性。最后通过解算,得到北京站北斗伪距点定位结果,得出平面精度可以达到4 m左右,高程定位精度优于8 m,能满足普通导航定位需求。 | 陆亚峰 楼立志 马绪瀛 蒋海林 | 2013 | 矿山测量2013，，4： | 7 |
| 19 | Analysis of RDSS positioning accuracy based on RNSS wide area differential technique显示文摘The BeiDou Navigation Satellite System(BDS) provides Radio Navigation Service System(RNSS) as well as Radio Determination Service System(RDSS).RDSS users can obtain positioning by responding the Master Control Center(MCC) inquiries to signal transmitted via GEO satellite transponder.The positioning result can be calculated with elevation constraint by MCC.The primary error sources affecting the RDSS positioning accuracy are the RDSS signal transceiver delay,atmospheric trans-mission delay and GEO satellite position error.During GEO orbit maneuver,poor orbit forecast accuracy significantly impacts RDSS services.A real-time 3-D orbital correction method based on wide-area differential technique is raised to correct the orbital error.Results from the observation shows that the method can successfully improve positioning precision during orbital maneuver,independent from the RDSS reference station.This improvement can reach 50% in maximum.Accurate calibration of the RDSS signal transceiver delay precision and digital elevation map may have a critical role in high precise RDSS positioning services. | XING Nan SU RanRan ZHOU JianHua HU XiaoGong GONG XiuQiang LIU Li HE Feng GUO Rui REN Hui HU GuangMing ZHANG Lei | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，10： | 6 |
| 20 | 一种改进的BDS-2/BDS-3联合精密定轨系统偏差处理模型显示文摘针对BDS-2与BDS-3卫星之间的差异性,为实现观测数据深度融合,对BDS-2/BDS-3联合定轨中系统偏差(inter-satellite bias,ISB)模型进行研究。首先,基于奇异值分解提取相邻历元观测信息以增加数据利用率,提高ISB解算精度与可靠性;其次,分析了BDS-2/BDS-3联合定轨中ISB特性,发现新信号与BDS-2之间存在明显与接收机相关偏差;随后,利用定轨法方程求解ISB与轨道相关性,结果显示,ISB对北斗轨道精度影响较GPS(global positioning system)显著;最后,通过对ISB时间序列建立短期预报模型,并将预报值作为约束条件引入超快速定轨中。实验结果表明,针对BDS-2/BDS-3超快速轨道,利用提出的ISB的估计与预报模型,可分别改善BDS-2与BDS-3轨道18 h重叠弧段精度(一维)-0.4~1.0 cm与0.8~4.1 cm。因此,所提出的改进的ISB处理模型对优化BDS-2/BDS-3联合定轨策略具有一定参考意义。 | 胡超 王中元 王潜心 饶鹏文 | 2021 | 武汉大学学报(信息科学版)2021，46，3： | 6 |
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