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ITK and Dual Antenna Receivers

Frequently asked questions about ITK on dual antenna receivers such as the OEM 7720 and PwrPak 7D. 

Q1: Can interference be detected and logged from the second antenna?

A1: Yes. By default, interference detection is on for the first antenna but not the second.  To configure detection on the second antenna, use an ITDETECTCONFIG_1 command.  Once this is done, interference detection results for the second antenna will be logged in ITDETECTSTATUS_1.

Q2: Can the RF spectrum be logged by the second antenna?

A2: Yes.  It can be configured with the ITSPECTRALANALYSIS_1 command and logged with the ITPSDFINALB_1 log. 

Q3: Can filters be applied on the secondary antenna? Related, are filters automatically applied to both antennas?

A3: Yes, filters can be applied to the secondary antenna, however, they are not automatically applied to both antennas.  A user can use ITPROGFILTCONFIG_1 or ITBANDPASSCONFIG_1 to configure a filter on a signal path on the secondary antenna, and ITFILTTABLE_1 to see the configured filters. The available filters are in ITBANDPASSBANK_1 and ITPROGFILTBANK_1

Q4: Does the ITWARNINGCONFIG command apply to both antennas?

A4: Yes, ITWARNINGCONFIG is applied to both antennas. There is no ITWARNINGCONFIG_1 command.

Q5: Which ITK logs or commands allow an _1 extension?

A5: Here are the commands:

Here are the logs:

Example

Here is an example of how to use dual antenna ITK:

At startup, send this command to detect interference on both antennas, rather than just the first antenna (note that ITDETECTCONFIG ALL is a default command):

ITDETECTCONFIG_1 ALL
 

To view the detection status from both antennas, log:

LOG ITDETECTSTATUSB ONCHANGED
LOG ITDETECTSTATUSB_1 ONCHANGED
 

To view the spectrum from the primary antenna, commands like these could be used:

ITSPECTRALANALYSIS PREDECIMATION GPSL1 1000 8K 5 2
LOG ITPSDFINALB ONNEW
 

To view the spectrum from the secondary antenna, commands like these could be used.  Note that only one spectrum can be collected at a time. 

ITSPECTRALANALYSIS_1 PREDECIMATION GPSL1 1000 8K 5 2
LOG ITPSDFINALB_1 ONNEW
 

If interference is identified that should be mitigated on the primary antenna, use commands such as this to view allowable filters, choose a filter, and confirm it is configured:

LOG ITBANDPASSBANKA
ITBANDPASSCONFIG BEIDOUB1 ENABLE 1555
LOG ITFILTTABLEA
 

or:

LOG ITPROGFILTBANKA
ITPROGFILTCONFIG GPSL1 PF0 ENABLE NOTCHFILTER 1580 1
LOG ITFILTTABLEA
 

Similarly, on the secondary antenna these commands can be used.  Note that the allowable filters vary based on the channel configuration.

LOG ITBANDPASSBANKA_1
ITBANDPASSCONFIG_1 BEIDOUB1 ENABLE 1555
LOG ITFILTTABLEA_1
 

or:

LOG ITPROGFILTBANKA_1
ITPROGFILTCONFIG_1 GPSL1 PF1 ENABLE NOTCHFILTER 1580 1
LOG ITFILTTABLEA_1
 

To change to HDR mode on all RF paths for both antennas, use these commands:

ITFRONTENDMODE L1 HDR
ITFRONTENDMODE L2 HDR
ITFRONTENDMODE_1 L1 HDR
ITFRONTENDMODE_1 L2 HDR
 

To log the interference detection spectrum from both antennas, enter:

LOG ITPSDDETECTB ONNEW
LOG ITPSDDETECTB_1 ONNEW
 

Please contact NovAtel Support for remaining questions or technical issues concerning ITK on dual antenna receivers, or visit the NovAtel Support page for additional resources.

NovAtel Support

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