Chapter 3 OEM7 Receiver Operation
OEM7 Installation and Operation User Manual v4
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3.11 Interference Toolkit
The Interference Toolkit (ITK) feature monitors, quantifies and removes interference sources to
prevent interference from impacting receiver performance.
Using the Interference Toolkit, you can monitor the Radio Frequency (RF) spectrum in a range of
frequencies around the GNSS signals that are being received by the OEM7 receiver. If an inter-
ference signal is detected, information about the interference is output in the
ITDETECTSTATUS
log. More information about the interference signal can be determined by
plotting the information obtained.
Signals available are model dependent. A variety of mitigation techniques are available. Contact
www.novatel.com/where-to-buy/sales-offices
to activate full mitigation features.
3.11.1 Monitoring GNSS Signals
By default, interference detection is enabled. Detection can be disabled/enabled as needed. See
on page 73 for instructions. Detected interference can be viewed and
different tracking modes with possible additional filters can be applied to mitigate the inter-
ference using NovAtel Connect. Detected interference details can also be logged and analyzed
using the command line interface.
There are two types of interference detection available, Spectral Analysis Detection and Stat-
istical Analysis Detection.
NovAtel recommends using the default settings for Interference Toolkit whenever pos-
sible.
NovAtel Connect 2.0 or greater is required to use Interference Toolkit functionality.
Download NovAtel Connect from
www.novatel.com/novatel-connect.
Spectral Analysis Detection
Spectral Analysis Detection is focused on in-band, near-band, and strong out-band interference
detection.
OEM7 uses receiver gain calibration data that stored in receiver memory at receiver start-up.
The calibration data is used to estimate the antenna gain before receiver, as well as generate
interference free spectrum reference for spectral analysis detection. The receiver assumes that
the receiver is in an interference free environment during start-up and the antenna is connected
to receiver and powered up.
When using the Interference Toolkit, the receiver must be reset when the GNSS antenna
is connected or disconnected.
If a known interference source is present at the receiver start up, it's strongly recom-
mended that users enter the calibrated receiver input gain using the
RFINPUTGAIN
command.
