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Satellite-Based Augmentation Systems

This January/February 2016 issue of Inside GNSS features two articles dealing with satellite-based augmentation systems (SBAS).

The issue also includes an article by another set of ISRO authors, describing a new approach to measuring navigation payload absolute delay to improve ranging accuracy to navigation satellites.

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GAGAN — India’s SBAS
Redefining Navigation over the Indian Region
Recognizing the potential benefits of satellite-based augmentation systems, India took the early initiative to create its own SBAS called GAGAN — GPS Aided Geo Augmented Navigation.

GNSS Satellite-Based Augmentation Systems
A Potential New Time Keeping System for Future Generations
This article describes development and testing of a novel time-keeping system that could provide increased time-synchronization performance for future upgrades of both the onboard and ground segments of SBAS systems.

Measuring Navigation Payload Absolute Delay
In Radiation Mode
Satellite navigation signals transmitted on different carrier frequencies are imperfectly synchronized due to different hardware paths corresponding to each signal. An engineering team from the Indian Space Research Organization presents a laboratory method to measure the total navigation payload delay in satellite transmissions.

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