An improved Kloubuchar ionospheric correction model for single frequency GNSS receivers
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Venkata Ratnam Devanaboyina
Abstract
The enhancement of positional accuracy of single frequency ionospheric correction models is an urgent need for low-cost and smartphone GNSS users. The available single frequency ionospheric correction models such as Klobuchar, NeQuick-G, NTCM, and Klob-BDS are providing ionospheric corrections for multi GNSS systems such as GPS, Galileo, BDS, and NAVIC systems. Otherwise, Global Ionospheric Map (GIM) Total Electron Content (TEC) corrections are also available to the GNSS users. In this letter, an improved Klobuchar ionospheric model is implemented. The slant TEC of dual Frequency GPS TEC observations is considered a reference. The Klobuchar model slant TEC observations are improved by taking the grid-based residual TEC corrections with the Adjusted Spherical Harmonic Function model. The Single frequency users can improve the ionospheric delay estimation using Klobuchar model and grid-based TEC residual corrections. The improved ionospheric correction model is tested under the biggest geomagnetic storm conditions during 24th Solar cycle that occurred in March 2015 over India. The proposed hybrid slant ionospheric TEC algorithms are evaluated with individual single frequency ionospheric models (Klobuchar, and GPS TEC) under adverse space weather conditions.
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Author contributions: The author has accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was done for the project-work entitled, “Migation of lonospheric Scintillation noise effects on lndian Satellite Navigation System (NAVIC) signals using software defined radio GNSS receiver”, (Ref: 8–99/FDC/RPS/ Policy-1/2021-22) sponsored by the (AICTE-RPS), Govt. of India.
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Conflict of interest statement: The author declares no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Review
- Implementation of the EVRF2007 height reference frame in Poland
- Original Research Articles
- Assessment of android smartphones positioning in multi-GNSS/NavIC environment
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- Classification and object detection with image assisted total station and machine learning
- Reference clock impact on GNSS clock outliers
- Changes in the long-term stability of GPS, GLONASS and Galileo clocks based on the IGS repro3 campaign
- An improved Kloubuchar ionospheric correction model for single frequency GNSS receivers
- Comparative analysis of regression algorithms for the prediction of NavIC differential corrections
- Modeling 3D crustal velocities in the vicinities of Alaska and the Bering sea
Articles in the same Issue
- Frontmatter
- Review
- Implementation of the EVRF2007 height reference frame in Poland
- Original Research Articles
- Assessment of android smartphones positioning in multi-GNSS/NavIC environment
- Automatic quality assessment of terrestrial laser scans
- Improvement of international reference ionospheric model total electron content maps: a case study using artificial neural network in Egypt
- Implementing SRIF filter with MANS-PPP software package for GNSS precise point position solution accuracy enhancement
- Classification and object detection with image assisted total station and machine learning
- Reference clock impact on GNSS clock outliers
- Changes in the long-term stability of GPS, GLONASS and Galileo clocks based on the IGS repro3 campaign
- An improved Kloubuchar ionospheric correction model for single frequency GNSS receivers
- Comparative analysis of regression algorithms for the prediction of NavIC differential corrections
- Modeling 3D crustal velocities in the vicinities of Alaska and the Bering sea
