What is spoofing and how to ensure GPS security?: Page 4 of 5

October 01, 2019 // By Maria Simsky
spoofing
As technological advances make GPS/GNSS devices more affordable, our lives are becoming increasingly dependent on precise positioning and timing. Industries such as survey, construction and logistics rely on precise positioning for automation, efficiency and safety.

Satellite navigation data authentication

Fig. 3: European Galileo satellites provide an open
authentication service on the E1 signal and a commercial
authentication service on the E6 signal. Picture, courtesy of
the European Space Agency.

Various countries invest in spoofing resilience by building security directly into their GNSS satellites. With OS-NMA (Open Service Navigation Message Authentication), Galileo is the first satellite system to introduce an anti-spoofing service directly on a civil GNSS signal.

OS-NMA is a free service on the Galileo E1 frequency. It enables authentication of the navigation data on Galileo and even GPS satellites. Such navigation data carries information about satellite location and if altered will result in wrong receiver positioning computation. While currently in development, OS-NMA is planned to become publicly available in the near future. Also GPS is experimenting with satellite based anti-spoofing for civil users with their recent Chimera authentication system.

Recently, within the scope of the FANTASTIC project led by GSA, OS-NMA anti-spoofing protection was implemented on a Septentrio receiver.

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