On the use of an effective ionospheric height in electron content measurement by GPS reception
On the use of an effective ionospheric height in electron content measurement by GPS reception
复制标题
DOI：
10.1029/2000rs002601
复制
发表时间：
2002-01
期刊：
影响因子：
1.6
通讯作者：
M. J. Birch;J. Hargreaves;G. J. Bailey
中科院分区：
文献类型：
--
作者：
M. J. Birch;J. Hargreaves;G. J. Bailey
本文提出了一种利用垂直和倾斜同时观测来估算有效壳层高度的实验方法。兰开夏郡位于北纬53°，是一个很好的观测点，因为GPS卫星轨道与地球赤道面成55°角，因此，许多GPS轨道几乎直接从头顶经过，提供了真正的天顶测量。本文主要讨论斜天顶改正及相关问题。特别是，等离子体层的有效高度和卫星偏差的修正是通过测量总电子含量（TEC）从卫星对一个单一的地面站，每对同时观察倾斜和天顶TEC。通过使用同时具有相同高度的卫星对提取TEC来确定附加偏差校正。Chapman生产函数模型和谢菲尔德大学等离子体层和电离层模型都被用来确定等离子体层有效高度的理论值。结果表明，在斜顶薄壳层转换中使用的等离子体层有效高度比通常采用的350 km值大得多。根据所有现有证据，建议600至1200 km之间的值是可取的。假设一个较低的值可能会产生15至30%或更多的电子含量的误差。
An experimental method, using simultaneous vertical and slant observations, has been derived for estimating the effective shell height for electron content measurement by GPS reception. At a latitude of approximately 53° north, Lancashire is well placed as an observing site since GPS satellite orbits are inclined at 55° to the Earth's equatorial plane and, as a result, many GPS tracks pass almost directly overhead, giving true zenithal measurements. This paper focuses on the question of oblique‐to‐zenithal correction and related matters. In particular, plasmaspheric effective height and satellite bias corrections are determined by measuring the total electron content (TEC) from pairs of satellites to a single ground station, each pair giving simultaneous observations of oblique and zenithal TEC. Additional bias corrections are determined by extracting the TEC using pairs of satellites with the same elevation at the same time. The Chapman Production Function Model and the Sheffield University Plasmasphere and Ionosphere Model are both used to determine a theoretical value for the plasmaspheric effective height. The results indicate that the plasmaspheric effective height used in the oblique‐to‐zenithal thin shell conversion is considerably greater than the commonly adopted value of 350 km. It is suggested, on the basis of all the available evidence, that a value between 600 and 1200 km is preferred. Assuming a lower value could produce an error of 15 to 30% or more in the electron content.