Generation of Klobuchar Coefficients for Ionospheric Error Simulation
An ionospheric error simulation is needed for creating precise Global Positioning System (GPS) signal using GPS simulator. In this paper we developed Klobuchar coefficients αn and βn (n = 1, 2, 3, 4) generation algorithms for simulator and verified accuracy of the algorithm. The algorithm extract...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2010-06-01
|
| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2010/v27n2/OJOOBS_2010_v27n2_117.pdf |
| Summary: | An ionospheric error simulation is needed for creating precise Global Positioning System (GPS) signal using GPS simulator.
In this paper we developed Klobuchar coefficients αn and βn (n = 1, 2, 3, 4) generation algorithms for simulator and
verified accuracy of the algorithm. The algorithm extract those Klobuchar coefficients from broadcast (BRDC) messages
provided by International GNSS Service during three years from 2006 through 2008 and curve-fit them with sinusoidal
and linear functions or constant. The generated coefficients from our developed algorithms are referred to as MODL
coefficients, while those coefficients from BRDC messages are named as BRDC coefficients. The maximum correlation
coefficient between MODL and BRDC coefficients was found for α 2 and the value was 0.94. On the other hand, the
minimum correlation was 0.64 for the case of α1
. We estimated vertical total electron content using the Klobuchar
model with MODL coefficients, and compared the result with those from the BRDC model and global ionosphere maps.
As a result, the maximum RMS was 3.92 and 7.90 TECU, respectively. |
|---|---|
| ISSN: | 2093-5587 2093-1409 |