Schematic diagram of GNSS spoofing scenario. From: Gao & Li, IEEE Transactions on Vehicular Technology
By Jesse Khalil,
Published by GPS World, 18 August 2025
GNSS spoofing has become a regular occurrence with the potential for severe consequences when precise and reliable positioning is critical. Legacy GNSS signals are the primary target for bad actors, as most precise positioning relies on these signals, and it’s constantly getting easier and cheaper for people to fake the message. To combat this, Trimble has introduced Trimble RTX-NMA (Navigation Message Authentication), the first solution on the market to mitigate spoofing attacks on the GPS and BeiDou satellite constellations. Trimble RTX-NMA leverages the Trimble RTX correction service and enhances the security and integrity of GNSS navigation messages for all Trimble ProPoint receivers. Used in conjunction with Galileo OSNMA, users now have three constellations protected from spoofing attacks.
Trimble RTX-NMA seeks to detect both fake GNSS signals and faulty ephemeris data through real-time authentication that ensures navigation messages from multiple RTX reference station receivers are genuine and trustworthy. It also encompasses faulty ephemeris detection, preventing unreliable data from being included in the correction stream. Enhanced security through advanced cryptographic techniques like AES encryption, and stream authentication, take it a step further. Trimble RTX-NMA is also compatible with various Trimble GNSS receivers using firmware version 6.40 or greater, making it a versatile solution for a wide range of applications without a subscription. With these features, Trimble RTX-NMA offers increased reliability, enhanced security, and improved integrity — an added layer of defense against potential threats such as spoofing.
As reliance on GNSS continues to grow, ensuring the security and integrity of navigation data becomes paramount. Trimble RTX-NMA represents a significant step forward in addressing these challenges, offering a robust and effective solution for enhancing GNSS security.
See: Original Article
