ITFILTTABLE

Filter configuration for each frequency

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

The ITFILTTABLE log contains the filter configuration summary for each frequency. It lists which bandpass or notch filters are enabled and how each is configured.

For dual antenna receivers, an ITFILTTABLE_1 log can be requested to view the filter configuration summary for the second antenna. As described in Table: Binary message header structure, the message type indicates the log is from the second antenna. To request an ASCII log enter ITFILTTABLEA_1, and for a binary log enter ITFILTTABLEB_1.

The ITFILTTABLE and ITFILTTABLE_1 logs use the same message ID.

Refer to Table: Filter warnings and constraints for information about location-based warnings, constraints, and best practices to ensure optimal filtering performance. These constraints are based on the position of the filter's cutoff or centre frequency relative to the signal's centre frequency.

Filter warnings and constraints

Signal

Bandpass filter

Notch filter width

0.15 MHz

0.5 MHz

1.0 MHz

2.5 MHz

Refer to the ITPROGFILTBANK and ITBANDPASSBANK logs for supported signal configurations.

Warning flag raised for ≤7 MHz single-sided band.

Filter not applied for <2.5 MHz single-sided band.

No warning flag raised.

Warning flag raised for ≤7 MHz single-sided band.

Warning flag raised at any location.

Message ID: 1991

Log type: Asynch

Recommended input:

log itfilttablea once

ASCII example:

#ITFILTTABLEA,USB1,0,52.5,FINESTEERING,2209,507953.506,12000020,35d0,16809;

23,
GPSL1,8,CIC3,00000000,DISABLE,0.0000,0.0000,1,ENABLE,PF0,NOTCHFILTER,1569.0000,1581.0000,0.150,

GPSL2,4,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GLONASSL1,9,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GLONASSL2,5,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GPSL5,0,CIC3,00000000,DISABLE,0.0000,0.0000,0,

LBAND,11,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GALILEOE1,8,CIC3,00000000,DISABLE,0.0000,0.0000,1,ENABLE,PF0,NOTCHFILTER,1569.0000,1581.0000,0.150,

GALILEOE5A,0,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GALILEOE5B,1,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GALILEOALTBOC,10,CIC3,00000000,DISABLE,0.0000,0.0000,0,

BEIDOUB1,2,CIC3,00000000,DISABLE,0.0000,0.0000,0,

BEIDOUB2,1,CIC3,00000000,DISABLE,0.0000,0.0000,0,

QZSSL1,8,CIC3,00000000,DISABLE,0.0000,0.0000,1,ENABLE,PF0,NOTCHFILTER,1569.0000,1581.0000,0.150,

QZSSL2,4,CIC3,00000000,DISABLE,0.0000,0.0000,0,

QZSSL5,0,CIC3,00000000,DISABLE,0.0000,0.0000,0,

QZSSL6,6,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GALILEOE6,6,CIC3,00000000,DISABLE,0.0000,0.0000,0,

BEIDOUB3,7,CIC3,00000000,DISABLE,0.0000,0.0000,0,

GLONASSL3,10,CIC3,00000000,DISABLE,0.0000,0.0000,0,

NAVICL5,0,CIC3,00000000,DISABLE,0.0000,0.0000,0,

BEIDOUB1C,8,CIC3,00000000,DISABLE,0.0000,0.0000,1,ENABLE,PF0,NOTCHFILTER,1569.0000,1581.0000,0.150,

BEIDOUB2A,0,CIC3,00000000,DISABLE,0.0000,0.0000,0,

BEIDOUB2B,1,CIC3,00000000,DISABLE,0.0000,0.0000,0*cfb2b0d4

Field

Field type

Description

Format

Binary bytes

Binary offset

1

Log header

ITFILTTABLE header

For information about log headers, see ASCII, Abbreviated ASCII or Binary.

-

H

0

2

# entries

Number of records with information to follow

Ulong

4

H

3

frequency

The frequency at which the filter is applied. See Table: Frequency types

Enum

4

H+4

4

Encoder ID

ID of the digital path used by this frequency

Ulong

4

H+8

5

DDC filter type

The DDC filter type (see Table: DDC filter type)

Enum

4

H+12

6

status word

Filter warning limit status. Raise a warning flag if the filter is placed too close to the centre frequency of the GNSS signal (see Table: ITFILTTable status word)

Ulong

4

H+16

7

switch

Filter is enabled or disabled (see Table: Filter switches)

Enum

4

H+20

8

lower cut off frequency

Cut off frequency at the lower end (MHz)

Float

4

H+24

9

upper cut off frequency

Cut off frequency at the upper end (MHz)

Float

4

H+28

10

# prog filters

Number of programmable filters applied

Ulong

4

H+32

11

switch

Filter is enabled or disabled (see Table: Filter switches)

Enum

4

H+36

12

prog filter ID

The programmable filter ID (see Table: Programmable filter ID)

Enum

4

H+40

13

mode

Programmable filter mode (notch filter or bandpass) (see Table: Programmable filter mode)

Enum

4

H+44

14

lower cut off frequency

Cut off frequency at the lower end (MHz)

Float

4

H+48

15

upper cut off frequency

Cut off frequency at the upper end (MHz)

Float

4

H+52

16

notch width

Width of notch filter (MHz)

Float

4

H+56

17

Next programmable filter – variable binary offset

18

Next frequency – variable binary offset

19

xxxx

32-bit CRC (ASCII and Binary only)

Ulong

4

Variable

20

[CR][LF]

Sentence terminator (ASCII only)

-

-

-
DDC filter type

Binary

ASCII

0

PASSTHROUGH

1

CIC1

2

CIC2

3

CIC3

4

HALFBAND
ITFILTTable status word

Nibble

Bit

Mask

Description

Range value

N0

0

0x00000001

First enabled filter

0 = Within acceptable limit

1 = Warning

1

0x00000002

2

0x00000004

3

0x00000008

N1

4

0x00000010

5

0x00000020

6

0x00000040

7

0x00000080

N2

8

0x00000100

Second enabled filter

0 = Within acceptable limit

1 = Warning

9

0x00000200

10

0x00000400

11

0x00000800

N3

12

0x00001000

13

0x00002000

14

0x00004000

15

0x00008000

N4

16

0x00010000

Third enabled filter

0 = Within acceptable limit

1 = Warning

17

0x00020000

18

0x00040000

19

0x00080000

N5

20

0x00100000

21

0x00200000

22

0x00400000

23

0x00800000

N6

24

0x01000000

Fourth enabled filter

0 = Within acceptable limit

1 = Warning

25

0x02000000

26

0x04000000

27

0x08000000

N7

28

0x10000000

29

0x20000000

30

0x40000000

31

0x80000000
Filter switches

Binary value

ASCII value

Description

0

DISABLE

Filter disabled

1

ENABLE

Filter enabled