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ionospheric delay
    The performance and characteristic of the receiver NTSCGPS-2 are as follows:(1)It can measure the ionospheric delay in real time via dual-frequency observation;
    NTSCGPS-2具有如下性能特点:(1)采用双频观测,可实测电离层时延;
    AN IMPROVED GRID-BASED CORRECTION ALGORITHMS FOR THE IONOSPHERIC DELAY IN WAAS
    改进的WAAS电离层时延网格修正算法
    Determing Ionospheric Delay with Two-way Satellite Dual-frequency Observation
    通过卫星双向双频观测对电离层时延的测定
    Errors, such as ionospheric delay variations, satellite ephemeric errors and the shape uncertainty of the earth (the geoid) can be largly compensated by using differential technology.
    诸如星历误差、电离层时延变化和地球模型不准等误差,通过应用差分技术可以大部分消除。
    To improve the algorithm of the correction in differential GPS,this paper presents a simple and vivid ionospheric model on the basis of the contours of monthly average ionospheric time delay,and analyses the positioning error introduced only by the ionospheric delay in the conventional GPS and the position differential GPS.
    为了改进差分GPS的校正算法,本文在月平均电离层时延等值图的基础上,建立了一个简单而又逼真的电离层模型,并分析了普通GPS和位置差分GPS仅电离层单一因素引入的定位误差。
    DGPS removes only the common errors such as selective availabi lity and ionospheric delay errors.
    差分 GPS只能消除选择可用性和电离层时延等公共误差 ,对多径干扰仍无能为力。
    The results indicate that the precisions for single-station timing and GPS-CV(Common-View)time transfer after correcting the ionospheric delay with TEC-map are better than those with the theoretical model for single-frequency GPS receivers.
    结果表明 :对于单频GPS接收机 ,采用TEC图作电离层时延改正后的单站定时和共视比对精度比用理论模型作改正的精度有很大的提高。
    The selection of common view data and the methods of filtering the random noise from the observed data are introduced. The metheds to correct ionospheric delay and geometric delay for GPS CV comparison are expounded. The calculation results for the data of CV comparison between NTSC(National Time service Conter,the Chinese Academy of Sciences)and CRL(Communications Research Laborntory,which has been renamed National Institute of Information and Communications Technology)are presented.
    介绍了GPSCV时间比对中共视数据的选取和消除观测数据中的随机噪声的方法,对GPS共视时间比对中的电离层时延改正和几何时延改正方法作了阐述,给出了对NTSC(中国科学院国家授时中心)与CRL(日本通信研究所,现已更名为国家信息和通信技术研究院(NICT))两个时间实验室之间的共视比对数据的计算结果。
    Though the data of eight GPS stations, the paper calculates slant ionospheric delay by using WASS ionospheric grid algorithm, and comparison is made between prediction values and observed ones.
    对不同纬度的 8个 GPS观测台站得到的数据 ,采用广域增强系统 (WASS)电离层网格算法计算了斜向电离层时延 ,并将计算结果同实际观测值之间的差别进行了统计分析 .
    A method of determing the ionospheric delay with the two-way satellite dual-frequency(C band)observation is introduced,and the results from the observations for different longitudes and latitudes are analysed and compared to each other.
    介绍了利用卫星双向双频(C波段)观测来测定电离层时延的方法,并对不同经纬度的观测结果进行了比较和分析。
 

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