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Shah, Shweta N.
- The GIVE Ionospheric Delay Correction Approach to Improve Positional Accuracy of NavIC/IRNSS Single-Frequency Receiver
Abstract Views :273 |
PDF Views:94
Authors
Affiliations
1 Department of Electronics Engineering, Sardar Vallabhbhai National Institute of Technology, Surat 395 007, IN
1 Department of Electronics Engineering, Sardar Vallabhbhai National Institute of Technology, Surat 395 007, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1665-1676Abstract
The Navigation with Indian Constellation (NavIC)/Indian Regional Navigation Satellite System (IRNSS) is an independent navigation system developed for the Indian subcontinent by the Indian Space Research Organisation (ISRO). The positional accuracy of this system is mainly affected by the ionosphere of the low-latitude equatorial Indian subcontinent, as large ionospheric gradients and intense irregularities are present in it. The objective of this study is to improve the positional accuracy of NavIC/IRNSS systems by applying ionospheric correction using the most suitable single-frequency model. The data to be analysed were collected from the NavIC/IRNSS receiver provided by the Space Applications Centre, ISRO. A comparative analysis between the dual-frequency model and single-frequency model (e.g. GIVE model, coefficient-based model) was performed on the data from the NavIC/IRNSS receiver. Different ionospheric models were applied to compute ionospheric delay (ionodelay) on a quiet day (3 < KP < 5). Our result shows that both the single-frequency Grid Ionosphere Vertical Error (GIVE) model and dual frequency model outperform remarkably compared to the traditional coefficient-based model. The GIVE model was also analysed on FAR categorized satellites for different stormy days of different months. It was observed that during stormy days also, the 3D position computed by applying the GIVE model was nearly the same as the dual-frequency model.Keywords
Ionosphere, Navigation Systems Tropospheric Delay, Positional Accuracy.Full Text
References
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- Impact of Wi-Fi Interference on NavIC Signal
Abstract Views :292 |
PDF Views:74
Authors
Affiliations
1 Electronics Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat 395 007, IN
1 Electronics Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat 395 007, IN
Source
Current Science, Vol 114, No 11 (2018), Pagination: 2273-2280Abstract
The Navigation with Indian Constellation (NavIC) designed by the Indian Space Research Organisation (ISRO) is an autonomous regional satellite navigation system for providing accurate real-time positioning and timing services to India up to 1500 km from its boundary. The NavIC system exploits L5- and S-band for its navigation. The performance of these bands may be interfered by other bands or out-of-band communication systems, which can be the main threat to the performance of the NavIC receiver. This article focuses on real-time out-of-band interference of Wi-Fi signals in the S-band of the NavIC receiver. The performance analysis is carried out with respect to power spectral density, histograms, execution of acquisition stage and parameters of hypothesis testing method like P-value, confidence interval to identify the presence of interference on the NavIC receiver. All these results show that the Wi-Fi signal transmission represents a potential source of interference for NavIC applications and causes severe degradation on NavIC satellite signals.Keywords
Power Spectral Density, Radio Frequency Interference, Satellite Navigation System, Wi-Fi Signals.Full Text
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