Mitigation of higher order ionospheric effects on GNSS users in Europe |
| |
| Authors: | M Mainul Hoque N Jakowski |
| |
| Institution: | (1) German Aerospace Center (DLR), Institute of Communications and Navigation, Kalkhorstweg 53, 17235 Neustrelitz, Germany;(2) International Postgraduate Programme Multi Sensorics, Center for Sensorsystems at University of Siegen, Paul-Bonatz-Str. 9-11, 57068 Siegen, Germany |
| |
| Abstract: | Current dual-frequency GPS measurements can only eliminate the first-order ionospheric term and may cause a higher-order range
bias of several centimeters. This research investigates the second-order ionospheric effect for GNSS users in Europe. In comparison
to previous studies, the electron density profiles of the ionosphere/plasmasphere are modeled as the sum of three Chapman
layers describing electron densities of the ionospheric F2, F1 and E layers and a superposed exponential decay function describing the plasmasphere. The International Geomagnetic Reference
Field model is used to calculate the geomagnetic field vectors at numerous points along the incoming ray paths. Based on extended
simulation studies, we derive a correction formula to compute the average value of the longitudinal component of the earth’s
magnetic field along the line-of-sight as a function of geographic latitude and longitude, and geometrical parameters such
as elevation and azimuth angles. Using our correction formula in conjunction with the total electron content (TEC) along the
line-of-sight, the second-order ionospheric term can be corrected to the millimeter level for a vertical TEC level of 1018 electrons/m2. |
| |
| Keywords: | GNSS positioning Signal refraction Second-order ionospheric correction |
| 本文献已被 SpringerLink 等数据库收录！ |
|
