RFINPUTGAIN
Configure the Calibrated Antenna Gain (CAG)
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Platform: |
OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700 |
Use this command to select the mode (AUTO or MANUAL) of setting the CAG for the purpose of interference detection.
If auto mode is used, the receiver will automatically compute the CAG at start up. In this case it is assumed that the receiver is powered up with its antenna connected and no interference is present.
If the antenna is changed, either reset the receiver or reissue this command to allow receiver to re-compute the CAG.
If manual mode is used, the CAG input by the user is used by the receiver to detect interference.
The CAG is defined to be the cascaded RF gain before receiver input plus LNA noise figure (NF), counting active antenna LNA gain, in-line amplifier, RF cable or distribution loss prior to receiver input connector.
A typical GNSS active antenna (of reasonable quality) has a noise figure of ~2dB (dominated by the LNA in an active antenna).
RFINPUTGAIN = Cascaded Gain before receiver + LNA NF
For advanced users.
If using this command in manual mode, the antenna gain must be accurately measured when the system is not experiencing any interference. If an erroneous CAG is injected, the interference detection performance can be degraded.
Message ID: 1658
Abbreviated ASCII Syntax:
RFINPUTGAIN RFPath [mode] [CAG]
Factory Default:
RFINPUTGAIN L1 AUTO
RFINPUTGAIN L2 AUTO
RFINPUTGAIN L5 AUTO
ASCII Example:
RFINPUTGAIN L1 MANUAL 30
RFINPUTGAIN L2 30
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Field |
Field Type |
ASCII Value |
Binary Value |
Description |
Format |
Binary Bytes |
Binary Offset |
|---|---|---|---|---|---|---|---|
|
1 |
Command header |
- |
- |
RFINPUTGAIN 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 |
RFPath |
L1 |
2 |
RF path selection |
Enum |
4 |
H |
|
L2 |
3 |
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|
L5 |
5 |
||||||
|
3 |
mode |
AUTO |
0 |
Calibrated Antenna Gain (CAG) mode. Default = MANUAL |
Enum |
4 |
H+4 |
|
MANUAL |
1 |
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|
4 |
CAG |
0.0-100.0 |
Calibrated Antenna Gain value If the mode is MANUAL, a value for CAG must be entered. |
Float |
4 |
H+8 |
|
|
RF Path |
OEM719, OEM729, |
OEM7720, |
OEM7500, OEM7600, |
|---|---|---|---|
|
L1 |
GPS L1 GLONASS L1 Galileo E1 BDS B1 QZSS L1 SBAS L1 |
GPS L1 GLONASS L1 Galileo E1 BDS B1 QZSS L1 SBAS L1 |
GPS L1 GLONASS L1 Galileo E1 BDS B1 QZSS L1 SBAS L1 |
|
L2 |
GPS L2 GLONASS L2 Galileo E6 BDS B3 QZSS L2/L6
|
GPS L2/L5 GLONASS L2/L3 Galileo E5 BDS B2 QZSS L2/L5 NavIC L5 SBAS L5 |
GPS L2/L5 GLONASS L2/L3 Galileo E5 BDS B2 QZSS L2/L5 NavIC L5 SBAS L5 |
|
L5 |
GPS L5 GLONASS L3 Galileo E5 BDS B2 QZSS L5 NavIC L5 SBAS L5 |
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