ITPROGFILTCONFIG

Enable and configure filtering on the receiver

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7

Use this command to set the programmable filter to be either a notch filter or a bandpass filter to mitigate interference in the pass band of GNSS signals. The notch filter is used to attenuate a very narrow band of frequencies (specified by the notch width) around the configured center frequency.

The bandpass filter is symmetrical in nature, which means that specifying one cutoff frequency will apply a cutoff on both the low side and high side of the spectrum center frequency.

The ITPROGFILTBANK log provides information on the allowable configuration settings for the programmable filter (i.e. the allowable settings for the notch filter and bandpass filter) for each frequency band. Only one filter can be applied for each frequency.

To enable a filter on the signal received from the secondary antenna of dual antenna receivers (OEM7720, PwrPak7D, PwrPak7D-E1, PwrPak7D-E2 and CPT7), use the ITPROGFILTCONFIG_1 command.

When applying a filter to a signal using the MEC correlator, a brief interruption in tracking may occur on affected channels.

This command is available only on some software models. Contact your NovAtel Sales representative (novatel.com/contactus/sales-offices) to obtain interference mitigation functionality.

Message ID: 2000

Abbreviated ASCII Syntax:

ITPROGFILTCONFIG frequency filterid switch [filtermode] [cutofffreq] [notchwidth]

ASCII Example:

ITPROGFILTCONFIG gpsl1 pf0 enable notchfilter 1580 1

Field	Field Type	ASCII Value	Binary Value	Description	Format	Binary Bytes	Binary Offset
1	Command header	-	-	ITPROGFILTCONFIG header This field contains the command name for abbreviated ASCII or the message header for ASCII (see page 1) or Binary (see page 1).	-	H	0
2	frequency	See Table: Frequency Types		Set the frequency band on which to apply the filter	Enum	4	H
3	filterid	See Table: Programmable Filter ID		Select the filter ID to use	Enum	4	H+4
4	switch	DISABLE	0	Disable the filter	Enum	4	H+8
4	switch	ENABLE	1	Enable the filter	Enum	4	H+8
5	filtermode	See Table: Programmable Filter Mode		Configure the type of filter to use (default = NONE)	Enum	4	H+12
6	cutofffreq			Center frequency for notch filter or cut off frequency for bandpass filter (MHz). Refer to ITPROGFILTBANK log for the allowable values. (default = 0)	Float	4	H+16
7	notchwidth			Notch width (MHz). Refer to ITPROGFILTBANK log for the allowable values. (default = 0)	Float	4	H+20

Programmable Filter ID
Binary Value	ASCII Value	Description
0	PF0	Programmable Filter 0
1	PF1	Programmable Filter 1

Programmable Filter Mode
Binary Value	ASCII Value	Description
0	NOTCHFILTER	Configure the filter as a notch filter
1	BANDPASSFILTER	Configure the filter as a bandpass filter
2	NONE	Turn off filter If the switch parameter is set to ENABLED while the filtermode parameter is set to NONE, the system will return a parameter out of range message.