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Improved determination of group delay variations (GDV) of GNSS transmitter and receiver systems

改进了 GNSS 发射机和接收机系统群时延变化 (GDV) 的确定

基本信息

批准号：
414706713
负责人：
Professor Dr.-Ing. Lambert Wanninger
金额：
--
依托单位：
Professur für Geodäsie (Grundlagen)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/414706713?language=en
关键词：
Improved determination group delay variations

项目摘要

GNSS code signals experience delays depending on their transmission and incidence an-gles, often called Group Delay Variations (GDV). They can be determined from multi-frequency GNSS observation data and be used as corrections for the code signals. Their use improves the results of all those GNSS applications that rely on accurate code obser-vations. In recent years a GDV determination method was developed at the Geodetic In-stitute of the TU Dresden. It is based on the analysis of code-phase-linear combinations and has been applied to observation data from globally distributed reference stations for the determination of elevation-dependent GDV of BeiDou-2 and GPS L1/L2 code signals applied.In this research project, the existing methodology of GDV determination will be extended in several aspects. The present parametrization will be enlarged to also cover azimuth dependencies of the GDV of transmitting and receiving systems. The methodology will be adapted to the many new signal frequencies and to additional satellite systems with their individual properties. An additional extension concerns the analysis of GNSS observations from LEO satellites, which provide another excellent data source for GDV determination. All these extensions will result in an overall methodology for GDV determination from GNSS observation data. Furthermore, its application will yield GDV correction data sets for all GNSS satellites and many geodetic GNSS receiving systems. In an additional working package, the potential of absolute GDV determinations from receiving systems at differ-ent orbital heights (earth’s surface, LEO orbits) will be analyzed in detail.

GNSS码信号根据其传输和入射角经历延迟，通常称为群延迟变化（GDV）。它们可以从多频GNSS观测数据中确定，并用作码信号的校正。它们的使用改进了所有那些依赖于准确码识别的全球导航卫星系统应用的结果。近年来，德累斯顿工业大学大地测量研究所开发了一种GDV测定方法。该方法基于码-相位-线性组合的分析，并应用于北斗二号卫星和GPS L1/L2码信号的高程相关GDV的确定。本参数化将被扩大以还覆盖发射和接收系统的GDV的方位角依赖性。该方法将适用于许多新的信号频率和具有各自特性的其他卫星系统。另一个扩展涉及分析来自LEO卫星的GNSS观测，这为GDV确定提供了另一个极好的数据源。所有这些扩展将导致GDV确定从GNSS观测数据的总体方法。此外，其应用将为所有全球导航卫星系统卫星和许多测地全球导航卫星系统接收系统产生全球大地观测值校正数据集。在一个附加的工作包中，将详细分析在不同轨道高度（地球表面，LEO轨道）接收系统的绝对GDV测定的潜力。