|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 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 |
| 2 | 高阶电离层延迟对GPS坐标时间序列的影响分析显示文摘基于高阶电离层延迟改正模型,确定了不同阶次电离层延迟对双频GPS载波信号的影响量,并根据国际地球自转与参考系统服务(international earth rotation and reference svstems service,IERS)协议2010推荐的最新模型,对全球均匀分布的109个国际GNSS服务(international GNSS service,IGS)跟踪站1999~2003年的全球定位系统(global positioning system,GPS)数据重新进行了精密处理,量化了高阶电离层延迟对全球GPS坐标时间序列的贡献。研究结果表明,高阶电离层延迟改正会造成较大的测站速度变化,在赤道附近的测站垂直速度变化最大可达约1mma^-1;能显著降低赤道附近测站垂直分量及亚洲南部测站南北分量的加权均方根(weighted root mean square,WRMS),最佳改善效果达10%(中国LHAS站南北分量);可有效减小IGS基准站各种不同周期信号的振幅;据此,提出高阶电离层延迟可能是造成中纬测站垂直周年、东西方向半周年及低纬测站垂直半周年运动的主要原因之一。 | 姜卫平 李昭 邓连生 夏传义 | 2014 | 科学通报2014，59，10： | 14 |
| 3 | 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 |
| 4 | 顾及二阶项影响的电离层延迟模型研究显示文摘在测量与定位领域建立电离层延迟模型是消除电离层影响的有效手段。传统的电离层延迟模型仅考虑一阶项的影响,不能满足精密测量和定位的需求。为此,采用曲面拟合的方法求解地磁场矢量,在不损失精度的情况下,曲面拟合法能够达到简化计算、方便使用的目的。推导顾及电离层二阶项延迟的天顶方向电子总含量(VTEC)模型的观测方程,建立顾及电离层二阶项延迟的VTEC模型。结合武汉跟踪站的数据对所建模型进行检验,证明该模型具有较高的定位精度。 | 牛瑞朝 郭承军 张奕然 | 2016 | 计算机工程2016，42，1： | 1 |
| 5 | 一种基于星载SAR编码有源定标器的电离层TEC测量方法显示文摘针对电离层对星载SAR线性调频信号影响与频率有关的特点,结合正负调频率的线性调频信号受电离层影响会出现脉冲信号的压缩和展宽现象,提出了一种基于星载SAR编码有源定标器的电离层TEC测量方法.利用编码有源定标器可以实现调频率反向的功能,通过分析调频率反向和不反向两种信号的相位差以及脉压后的位移差实现电离层TEC的精确测量,该方法不依赖于SAR与有源定标器之间的距离以及SAR发射信号的相位,减小了电离层TEC测量的误差因素,提高了电离层TEC的测量精度.针对BIOMASS,TerraSAR-L以及HJ1C三部不同频段的SAR系统进行了仿真分析,仿真分析结果与理论计算一致,证明了该方法的有效性. | 李亮 洪峻 明峰 | 2014 | 中国科学:信息科学2014，44，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员