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: sales-intech@trimble.com
Website: www.trimble.com/Precision-GNSS
© 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.
