...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Array-Aided Multifrequency GNSS Ionospheric Sensing: Estimability and Precision Analysis
【24h】

Array-Aided Multifrequency GNSS Ionospheric Sensing: Estimability and Precision Analysis

机译：阵列辅助多频GNSS电离层传感：可估计性和精度分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The dual-frequency Global Positioning System has proven to be an effective means of measuring the Earth's ionosphere and its total electron content (TEC). With the advent of multifrequency signals from more Global Navigation Satellite Systems (GNSSs), the opportunity arises to construct many more ionosphere-sensing combinations of GNSS data. With such diversity, various estimable ionospheric delays with differing interpretations (and of different precision) can be formed. How such estimable ionospheric delays should be interpreted, and the extent to which they contribute to the precision with which the unbiased TEC can be estimated, are the topics of this paper. Based on multifrequency GNSS code-only, phase-only, and phase-and-code data, we derive the closed-form solutions of different types of ionospheric observables that each can serve as input of an externally provided ionospheric model for TEC determination. Within such a general least-squares framework, we generalize the widely used phase-to-code levelling technique to its multifrequency version. We also show that only certain specific linear combinations of the observables contribute to the TEC solutions. As a further improvement of the multifrequency GNSS-derived TEC solution, we propose and study the usage of an array of GNSS antennas. Analytical solutions, supported by numerical examples, of this array-based concept are presented, together with a discussion on its relevance for TEC determination. This concerns the roles of time averaging and time differencing, of integer ambiguity resolution, and of the number of frequencies and number of array antennas in determining TEC.
机译：经证明，双频全球定位系统是测量地球电离层及其总电子含量（TEC）的有效手段。随着来自更多全球导航卫星系统（GNSS）的多频信号的出现，出现了构造更多更多电离层传感GNSS数据组合的机会。利用这种分集，可以形成具有不同解释（和不同精度）的各种可估计的电离层延迟。本文的主题是如何解释这种可估计的电离层延迟，以及它们在多大程度上有助于估算无偏TEC的精度。基于仅单频，仅相位和相位和代码数据的多频GNSS，我们得出了不同类型电离层可观测值的封闭形式解，每种解都可以用作确定TEC的外部电离层模型的输入。在这样一个通用的最小二乘框架内，我们将广泛使用的相位到代码均衡技术推广到其多频版本。我们还表明，只有某些特定的可观测线性组合有助于TEC解决方案。作为对多频GNSS衍生的TEC解决方案的进一步改进，我们提出并研究了GNSS天线阵列的使用。提出了这种基于阵列的概念的分析解决方案，并得到了数值示例的支持，并讨论了其与TEC测定的相关性。这涉及时间平均和时间差，整数歧义分辨率以及确定TEC的频率数量和阵列天线数量的作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号