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Comparative Studies on Methods to Overcome the Ionospheric Effects on GNSS Signals

Global Navigation Satellite System (GNSS) signals are relatively weak in nature and are more difficult to detect under impaired visibility conditions. For an effective position solution accuracy measurement of pseudorange solving for three unknown positions (latitude, longitude, and altitude) using at least three satellites are possible. One more satellite is required as time is considered as another unknown for solving the receiver clock bias. Ionospheric delay can cause error in pseudorange measurements. This is caused due to free ions which interfere with the Global Navigation Satellite System (GNSS) signal. These free ions in the atmosphere are created by solar and cosmic radiation. The ionospheric delay/ phase advance depends on weather, geographic location, solar, geomagnetic activities etc. Therefore, ionospheric delay is unpredictable. Ionospheric delay is considered a significant source of error in measuring the position solution determined by the GNSS signals. This paper proposes two main ideas for overcoming the ionospheric effects. One idea establishes that the inclusion of more satellites or Multi-GNSS scheme could be useful for overcoming the ionospheric effects. The other idea is to deliberately choose ionofree data for obtaining a better solution accuracy. This paper shows the usability of two aforesaid processes in different scenarios. The paper identified the sources of error mentioned by the previous research groups. From this background study the motivation for this research had been identified. Then the paper is organized with research methodology, obtained results, their discussions. In the conclusion section the gaps and future scopes for study have been discussed.

Pseudorange, Ionospheric, GNSS, Multi-GNSS

Shreya Sarkar, Anindya Bose. (2022). Comparative Studies on Methods to Overcome the Ionospheric Effects on GNSS Signals. American Journal of Aerospace Engineering, 9(2), 28-32.

Copyright © 2022 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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