Chapter 3 OEM7 Receiver Operation
CPT7 and CPT7700 Installation and Operation User Manual v12
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Contact
novatel.com/contactus/sales-offices
to obtain mitigation functionality.
High Dynamic Range Mode
The High Dynamic Range (HDR) mode enables special signal processing to remove distortions from the
spectrum, providing a cleaner signal. This optimizes the Automatic Gain Control (AGC) to prevent interfering
signals from drowning out the GNSS signals. HDR mode works well against wide band and out-of-band
interferers. HDR mode can be combined with bandpass and notch filters, but does draw more power.
To configure HDR mode, use the
ITFRONTENDMODE
command. HDR mode can also be enabled using
NovAtel Application Suite.
Notch Filter
The Interference Toolkit notch filter reduces the signal power in a narrow frequency band. This type of filter is
useful for reducing the signal power of a single, narrow band interference signal. Note that the narrowest
possible filter should be used to maintain the maximum amount of overall signal power.
To configure a notch filter, use the
ITPROGFILTCONFIG
command. A notch filter can also be configured
using NovAtel Application Suite.
Bandpass Filter
The Interference Toolkit bandpass filter reduces the signal power of all incoming signals at the upper and
lower end of the GNSS signal band starting at the requested cut-off frequency. This type of filter is good for
reducing single or multiple interference signals at the edges of the signal band.
When a bandpass filter is applied to this signal, the upper and lower ends of the signal band are filtered out to
reduce the signal power of the interference signal.
To configure a bandpass filter, use the
ITPROGFILTCONFIG
command or the
ITBANDPASSCONFIG
command. A bandpass filter can also be configured using NovAtel Application Suite.
3.10.6 Interference Toolkit Commands and Logs
The following are the commands and logs used by the Interference Toolkit to monitor, apply filters and mitigate
interference. Commands and logs with the √ are available by default. Contact
to activate full mitigation features.
Commands
ITBANDPASSCONFIG
Configures a bandpass filter on the receiver.
ITDETECTCONFIG
√
Enables or disables automatic interference detection on the receiver.
ITFRONTENDMODE
Configures the front end mode for each RF path to use the default tracking
mode or change to High Dynamic Range (HDR) mode.
ITPROGFILTCONFIG
Configures filtering on the receiver to be either a notch filter or a bandpass
filter.
ITSPECTRALANALYSIS
√
Configures and enables spectral analysis on the receiver.
ITWARNINGCONFIG
√
Configures the interference detection threshold on the receiver.
