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GNSS Augmentations and Other Navigation Satellite Systems
Published in Basudeb Bhatta, Global Navigation Satellite Systems, 2021
GAGAN is an implementation of SBAS by the Indian government. It is a system to improve the accuracy of a GNSS receiver by providing reference signals. It was developed jointly by the Airports Authority of India (AAI) and the Indian Space Research Organization (ISRO). As the name implies, this SBAS is compatible with GPS, however, Galileo is also being considered. Interoperability with other SBASs like WAAS, EGNOS, and MSAS has also been taken into account. The GAGAN was implemented to help pilots navigate in the Indian airspace and land aircraft in marginal weather and difficult approaches like Mangalore and Leh airports.
Global navigation satellite systems
Published in Francis Lyall, Paul B. Larsen, Space Law, 2017
Other countries are also establishing systems to augment GPS and other GNSS systems as necessary.85 The Japanese Multi-functional Transport Satellite-based Augmentation System (MTSAS) augments GPS accuracy in the Asian and Pacific Ocean regions.86 The Indian GAGAN system augments GPS accuracy in the Indian region.87
On land-use and land-cover changes over Lidder Valley in changing environment
Published in Annals of GIS, 2018
Mohammd Rafiq, Anoop Kumar Mishra, Mohammad Suhail Meer
Finally, a field survey was carried out to validate the results using the Cohen’s Kappa (k) statistics (Smits, Dellepiane, and Schowengerdt 1999; Dymond and Johnson 2002). We have collected a total no of 60 GPS points using the random sampling method. Trimble Juno SB (hand-held) GPS was used to collect the spatial data from the various features in the Lidder Valley. The GPS accuracy was improved with GAGAN signal to minimize the positional error (±1.5 m). After that, GPS points were overlaid on the image in order to identify the various tones in the LU/LC classes generated to check for digitization errors using Kappa coefficient (Equation I). It is a statistical measure of inter-rater agreement or inter-annotator agreement for qualitative (categorical) items (Lillesand, Kiefer, and Chipman 2014) and is widely used accuracy assessment technique.
Case Study: Performance Observation of NavIC Ionodelay and Positioning Accuracy
Published in IETE Technical Review, 2021
Mehul V. Desai, Shweta N. Shah
The GPS Aided GEO Augmented Navigation (GAGAN) system developed by ISRO and Airport Authority of India (AAI) together to provide high accuracy and precision in civil aviation [9–11]. The Ionospheric effect in GAGAN for the low latitude Indian subcontinent is mitigated based on different regional grid models such as Minimum Mean Square Error [11], Kriging, Inverse Distance Weighted (IDW) with the Klobuchar model and planar fit model [12]. Similarly, the local model such as Spherical Harmonic Function (SHF) model [13] modified the Klobuchar model for two shell model [14], Taylor Series Expansion (TSE) [15]. In the future, the NavIC receiver will be used as a reference station in GAGAN to transmit the correction to the aircraft.