GAGAN Performance Assessment for Aircraft Precision Approach
Narayan Dhital
The study provided an assessment of GAGAN services for APV-I and APV-II over the Indian territory. Satellite error bounds and ionospheric error bounds are analyzed as the main contributing integrity parameters. It is observed that during nominal periods the protection level performance requirements of APV-I are mostly met but still not enough to meet the 99.99% availability requirement.... [more]

Distributed GNSS Positioning-as-a-Service: Death of a Traditional GNSS Receiver?
Renato Filjar, Filip Šklebar and Ivica Zubic
Traditional concept of a GNSS receiver assumes the prevalent utilisation of dedicated electronic circuits, electrically pre-programmed to perform a dedicated tasks. The concept allows for fitting into a single black-box GNSS receiver unit, but lacks flexibility in modification, upgrade, and multi-usage of the initially pre-defined hardware of a particular purpose.... [more]

An architecture for a visual-based PNT alternative
Joshua J R Critchley-Marrows, Xiaofeng Wu and Iver H Cairns
RF-derived is the dominant PNT source being used in space today, leveraging off GNSS and ground tracking infrastructure. Even though these mechanisms are highly accurate, they are also easily jammed and spoofed from malicious sources, as well as being limited in coverage and availability.... [more]