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| 1 | The solutions of navigation observation equations for CAPS显示文摘Chinese scientists invent the navigation and positioning system based on commercial communications satellites and develop them successfully into China Area Positioning System (CAPS). In principle, this system is different from the GPS broadcasting satellite navigation class, where the propagation epoch of original navigation signals for pseudo-range measurement is from a ground master control station rather than from satellite transponders. This paper addresses the establishment of the three observation equation models for the navigation and positioning system based on communications satellites, and expresses them identically to operator equations and optimized models. Furthermore, both algorithms of the linear solution for the observable characteristic equation and the least-squares solution for the condition number more than 4 are discussed, with several methods for the exact solution, such as improving the behavior of coefficient matrices, right estimation for the weighted right hand side and selection of iteration forms of solutions, and the influence of the condition number on improving navigation and positioning accuracy is also analyzed carefully. Hopefully, all the works would be contributive to further development of the navigation and positioning system based on communications satellites, and be potentially valuable to other satellite navigation and positioning systems. | SHI HuLi PEI Jun | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，3： | 8 |
| 2 | Selection of satellite constellation framework of CAPS显示文摘Based on the idea of transmitting the satellite navigation and positioning system, taking the distribution and variation of the Position Dilution of Precision factor (PDOP), which is closely related with the precision of navigation and positioning, within the China area as the primary criterion, we analyze and discuss the tentative plan of constellation configuration consisting of geosynchronous orbit (GEO) communication satellites and inclined geosynchronous orbit (IGSO) satellites for the transmitting Chinese Area Positioning System (CAPS). We emphatically consider the effect on the PDOP by the three major orbit parameters including the inclination, eccentricity and right ascension of the ascend- ing node (RAAN) of IGSO satellites, to research the strategies of the constellation configuration of CAPS through software emulation. Various constellation configurations are analyzed and compared and the results show that the constellation configuration, consisting of three IGSO communication satellites in three orbits with the same inclination as 50°, the difference in RAAN as 120° and the same '8' shaped ground track centered near 115°E and four or five GEO communication satellites within 60°E to 150°E, can satisfy the requirement that Chinese domain is availably covered and the navigation and positioning with high precision could be obtained. Three relatively excellent constellation configurations are initially suggested and some concerned issues are discussed in this work. | HAN YanBen MA LiHua QIAO QiYuan YIN ZhiQiang AI GuoXiang | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，3： | 7 |
| 3 | The transmission link of CAPS navigation and communication system显示文摘The Chinese Area Positioning System (CAPS) is based on communication satellites with integrated capability, which is different from the Global Positioning System (GPS), the International Maritime Satellite Organization (Inmarsat) and so on. CAPS works at C-band, and its navigation information is not directly generated from the satellite, but from the master control station on the ground and transmitted to users via the satellite. The slightly inclined geostationary-satellite orbit (SIGSO) satellites are adopted in CAPS. All of these increase the difficulty in the design of the system and terminals. In this paper, the authors study the CAPS configuration parameters of the navigation master control station, information transmission capability, and the selection of the antenna aperture of the communication center station, as well as the impact of satellite parameters on the whole communication system from the perspective of the transmission link budget. The conclusion of availability of the CAPS navigation system is achieved. The results show that the CAPS inbound communication system forms a new low-data-rate satellite communication system, which can accommodate mass communication terminals with the transmission rate of no more than 1 kbps for every terminal. The communication center station should be configured with a large-aperture antenna (about 10-15 m); spread spectrum com- munication technology should be used with the spreading gain as high as about 40 dB; reduction of the satellite transponder gain attenuation is beneficial to improving the signal-to-noise ratio of the system, with the attenuation value of 0 or 2 dB as the best choice. The fact that the CAPS navigation system has been checked and accepted by the experts and the operation is stable till now clarifies the rationality of the analysis results. The fact that a variety of experiments and applications of the satellite communication system designed according to the findings in this paper have been successfully carried out confirms the correctness of the study results. | CUI JunXia SHI HuLi CHEN JiBin PEI Jun | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，3： | 6 |
| 4 | BDS-3多频伪距定位性能分析显示文摘北斗卫星导航系统(BeiDou navigation system,BDS)正式开通全球服务,为详细评估BDS-3全球定位性能,以全球16个MGEX跟踪站多天实测数据为基础,采用Net_Diff软件进行了全球范围内BDS-3单频、双频无电离层组合与双频非组合模型下双频、三频非组合模型和三频无电离层两两组合模型三频伪距单点定位解算试验,并与GPS、Galileo部分频率进行对比。结果表明,在亚欧非地区,BDS-3卫星数与空间几何构型优于GPS和Galileo。BDS-3单频中,B1C、B1I、B2a、B3I的水平与高程定位精度均在米级,与GPS和Galileo对比的定位精度关系为B1C>B1I>L1>B3I> B2a>E1>L2>E5a;BDS-3双频组合中,B2aB3I定位精度较差,不适合进行定位,B1CB2a、B1CB3I、B1IB2a、B1IB3I定位精度较优,与GPS和Galileo对比的定位精度关系为B1CB2a>B1CB3I>L1L2>B1IB3I>B1IB2a>E1E5a>B2aB3I;BDS-3三频组合中,B1IB2aB3I、B1CB2aB3I的水平定位精度优于1 m,高程定位精度优于2 m,与GPS和Galileo对比的定位精度关系为B1CB2aB3I>B1IB2aB3I>L1L2L5>E1E5aE5b。B1CB3I、B1IB3I、B1CB2a、B1IB2a适合利用非组合模型进行定位,B2aB3I适合利用无电离层模型进行定位,B1IB2aB3I和B1CB2aB3I适合利用非组合模型定位。BDS-3在全球范围内定位性能较优,甚至部分频率定位性能优于GPS和Galileo。 | 刘明亮 安家春 王泽民 张保军 宋翔宇 | 2023 | 武汉大学学报(信息科学版)2023，48，6： | 3 |
| 5 | 地面移动基站增强的CAPS广义延拓差分定位方法显示文摘为了提高转发式导航定位系统(CAPS)的单点定位精度,提出了一种利用已有的地面移动基站实现伪距差分定位的方法.该方法以检出多个基站处的伪距误差值为基础,用广义延拓插值模型建立测量点伪距误差修正的外推数据模型,从而求得测量点的伪距误差修正值,发送至用户,实现测量点的伪距差分修正.仿真分析表明,该方法能有效克服常规伪距差分改正精度受基线长度增加而造成精度递减的问题.CAPS和移动基站相结合,不仅能有效利用现有地面移动通信基站的资源,而且还能明显提高CAPS等卫星导航系统的定位精度. | 杜晓辉 施浒立 裴军 | 2013 | 西安电子科技大学学报2013，40，1： | 2 |
| 6 | 基于三维激光扫描技术测量叶片腹板合模间隙尺寸显示文摘叶片腹板粘接胶层厚度预测通常是在叶片试合模过程中压橡皮泥,测量的橡皮泥厚度为腹板粘接胶层厚度。本文提出利用三维激光扫描技术扫描叶片蒙皮和腹板外形,通过模拟合模方式形成合模模型并测量合模腹板间隙的测量方法。本文将通过三维激光扫描对腹板合模间隙进行测量得到的数据与试合模所压橡皮泥的数据进行对比,发现两者测试数据相近,可将三维激光扫描测量作为叶片腹板合模间隙的测量方法,实现免试合模过程,同时分析了影响测量精度的主要因素。 | 刘晓彬 朱坤 毛义梅 高雁辉 | 2020 | 复合材料科学与工程2020，，11： | 1 |
| 7 | BDS-3/BDS-2多频数据的长距离非差网络RTK算法显示文摘北斗三号卫星导航系统(BeiDou-3 satellite navigation system,BDS-3)已正式建成并提供服务,网络实时动态定位(real timekinematic,RTK)算法是提高北斗卫星导航系统(BeiDou satellite navigation system,BDS)定位精度的主要手段。提出了一种基于BDS多频多系统观测数据的长距离非差网络RTK算法。首先,通过顾及大气误差参数的多频载波相位整周模糊度解算模型,确定长距离BDS参考站的多频载波相位整周模糊度。然后,利用准确确定的参考站间载波相位整周模糊度,通过线性变化得到各参考站的非差整周模糊度,并计算各参考站的非差观测误差。考虑长距离测站间观测误差空间相关性减弱的特点,根据误差特性的不同分离出参考站网分类的非差误差改正数。最后,采用反距离加权法计算流动站的分类非差误差改正数,流动站通过非差误差改正数进行观测误差的改正和高精度定位。使用长距离连续运行参考站网的多频实测数据进行实验,结果表明:BDS-3的定位精度相对于北斗二号卫星导航系统(BeiDou-2satel-litenavigation system,BDS-2)在东、北、天各方向分别有15.7%、28%、11.9%的提高,定位性能与GPS相当甚至更优,多频数据的模糊度固定成功率和收敛时间较GPS双频数据有一定优势,BDS-3和BDS-2双系统定位结果优于单系统,二者均能实现流动站厘米级定位。该方法可避免双差观测值的相关性影响,空间误差计算效率高,流动站的定位更加灵活,充分发挥了BDS多频观测数据的优势。 | 祝会忠 张杰 赵齐乐 徐爱功 | 2023 | 武汉大学学报(信息科学版)2023，48，7： | 0 |
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