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| 1 | Research and progress of Beidou satellite navigation system显示文摘The paper gives a brief review of the development course and strategic planning of Beidou satellite navigation system,and introduces its construction progress,with emphasis on the research progress of some key technologies of Beidou,including navigation constellation design,navigation signal structure and performance,compatibility and interoperability,precise orbit determination,navigation and precise positioning.The main problems and challenges of Beidou are described. | SUN FuPing LIU Shuai ZHU XinHui MEN BaoHong | 2012 | Science China(Information Sciences)2012，55，12： | 20 |
| 2 | 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 |
| 3 | 一种适用于长基线的改进CIR算法显示文摘长基线下,受伪距多径和电离层残差影响,传统的CIR法解算载波相位宽巷模糊度时某些历元无法得到正确的结果,基础载波模糊度的搜索范围也较大。分析了CIR法的模糊度误差,提出了基于载波相位平滑伪距并且消除电离层时延的改进的CIR算法,分析了其误差方差,最后利用Compass系统实测数据对短基线和长基线两种情况下CIR法和改进CIR法的解算结果进行比较。实测数据表明,本文提出的算法能够单历元解算超宽巷模糊度和宽巷模糊度,并且能够大大缩小基础载波模糊度的搜索空间。 | 刘增军 彭竞 吕志成 欧钢 | 2013 | 国防科技大学学报2013，35，2： | 4 |
| 4 | 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 |
| 5 | GPS频间钟差特性分析及其对三频PPP的影响显示文摘针对全球定位系统(GPS)频间钟差(IFCB)显著影响多频精密单点定位(PPP)性能的问题,对全部GPS在轨的三频卫星的IFCB变化特性进行分析:可知BlockIIF卫星IFCB单日内变化从厘米到分米不等,存在明显的时变特性,而Block III卫星单日内变化量级较小,通常不超过1 cm,IFCB的时变特性相比于Block IIF卫星得到了明显的削弱;同时,BlockIIF卫星的IFCB存在12、6、8、4、4.8和3h的周期变化,并以此建立IFCB高阶谐波模型。实验结果表明,对于静态PPP,利用IFCB预报值改正后,定位精度在东(E)、北(N)、天(U)3个方向上分别提升29.4%、39.4%、35%;而对于动态PPP,利用IFCB预报值改正后,定位精度在E、N、U 3个方向上分别提升34.3%、20.0%、47.7%,同时可有效消除载波相位验后残差中的系统误差。 | 张蒲 屈利忠 王鲁平 王昊俣 | 2023 | 导航定位学报2023，11，2： | 0 |
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