Jamming Detection
The Antares 4G can detect GPS and cellular jamming through the modem's built-in jamming detection capability.
warning
JO Tag Not Implemented
The JO extended tag is not yet implemented in the current firmware. Jamming detection is available through signals only, not via the JO tag.
How It Works
The modem continuously monitors the radio frequency environment. When jamming is detected:
- Signal F23 (
SIGNAL_MDM_JAMMING_DETECTED) activates. - If jamming persists, signal G04 (
SIGNAL_MDM_JAMMING_PERSISTED) activates.
Signals
| Signal | Name | Description |
|---|---|---|
F23 | SIGNAL_MDM_JAMMING_DETECTED | Momentary jamming detection event |
G04 | SIGNAL_MDM_JAMMING_PERSISTED | Jamming condition continues to persist |
Configuring an Event for Jamming
Use the ED command to create an event that triggers when jamming is detected:
Objective: Send a report when jamming is detected.
Command:
>SED00NA0;F23+<
| Field | Value | Description |
|---|---|---|
ED | Event Definition | Command |
00 | Index | Event number (E00) |
N | Handler | N = Normal Report (send position report) |
A | Event ID | A type event |
0 | Destination | Destination address 0 |
F23 | Signal | Jamming detected signal |
+ | Sense | Positive edge (signal goes HIGH) |
Query the event:
>QED00<
Response:
>RED0NA0;F23+<
Recommended Response to Jamming
When jamming is detected:
- Log the event with a position report.
- If jamming persists (G04), escalate the alert.
Limitations
- Detection accuracy depends on the modem firmware and signal environment.
- False positives may occur in areas with dense cellular activity.
- The JO tag (real-time jamming indicator in report messages) is not yet available. It will be added in a future firmware release.