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TECHNICAL PUBLICATION TRANSFORMING THE WAY THE WORLD WORKS Trimble Maxwell™ 7 Technology can also cross-check orbital data from multiple sources (e.g for GPS L1 LNAV is compared to L2C and L5 CNAV). ► Receiver Autonomous Integrity Monitoring (RAIM) With more measurements than unknowns, the receiver has the ability to detect measurements that do not fit into the positioning solution. Newly tracked satellites that fail this test are put through additional tests before inclusion while existing satellites are immediately removed from the solution. RAIM is also calculated between GNSS constellations with complete systems being rejected, if necessary. This assumes a simplistic spoofing event where a subset of constellations are affected. For example, if only GPS is spoofed then by calculating multiple position solutions from subsets of measurements from GLONASS, BeiDou, Galileo, QZSS, NavIC, and SBAS the GNSS receiver can determine confidence that the GPS measurements need to be removed. ► Position Sanity Checks If the receiver detects positions have jumped by an unrealistic amount since the last computed position this is also a valuable indicator of spoofing. ► Limiting Satellite Search Window Utilizing recent tracking information, the GNSS receiver will limit the search window for reacquiring satellites that are temporarily lost and prevent a spoofing attack. CONCLUSIONS Trimble expects the occurrence of spoofing to increase in the future. These have the potential to disrupt critical applications. To prepare for this Trimble's precision receivers include Maxwell™ 7 Technology to identify and remove unwanted signals. As spoofing becomes more sophisticated, Trimble technology will continue to evolve to mitigate these challenges. Users can feel confident with advanced protection and the accuracy of their high-precision positioning solution from Trimble. For more information, please contact: TRIMBLE Integrated Technologies (Precision OEM GNSS) Email: Website: © 2020, Trimble Inc. All rights reserved. Trimble, the Globe & Triangle logo are trademarks of Trimble Inc., registered in the United States and in other countries. All other trademarks are the property of their respective owners.

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