RCB-F9T - Integration manual
Figure 11: Time pulse signal with the example parameters
3.11 Security
The security concept of RCB-F9T covers the air interface between the receiver and the GNSS
satellites and the integrity of the receiver itself.
There are functions to monitor/detect certain security threats and report it to the host system.
Other functions try to mitigate the threat and allow the receiver to operate normally.
The table below gives an overview about possible threats and which functionality is available to
detect and/or mitigate it.
Threat
u-blox solution
Over air signal integrity
Spoofing detection / monitoring
Jamming/interference detection / monitoring
GNSS receiver integrity
Table 19: u-blox security options
3.11.1 Spoofing detection / monitoring
Spoofing is the process where a counterfeit GNSS signal is transmitted locally to prevent the true
signal from being used and so produce an erroneous position fix and/or time solution.
The spoofing detection algorithm monitors multiple observed signal parameters for suspicious
changes to identify external manipulation. A flag in UBX-NAV-STATUS message (flags2 -
spoofDetState
) alerts the user to potential spoofing activity.
A detection is successful when a signal is observed to transition from an initially genuine one to a
spoofed version. Hence detection is not possible if the receiver is started under spoofing conditions.
The detection algorithms rely on availability of signals from multiple GNSS constellations - the
detection algorithm does not work in single-GNSS mode.
3.11.2 Jamming/interference detection / monitoring
The field
jamInd
of the UBX-MON-RF message can be used as an indicator for continuous
wave (narrow-band) jammers/interference only. The interpretation of the value depends on the
application. It is necessary to run the receiver in an unjammed environment to determine an
appropriate threshold for the unjammed case. If the value rises significantly above this threshold,
this indicates that a continuous wave jammer is present.
This monitoring function is always enabled.
The indicator reports any currently detected narrow-band interference over all currently configured
signal bands.
UBX-22004121 - R01
3 Receiver functionality
Page 38 of 64
C1-Public
Early production information
