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Template:FMB Features settings (view source)
Revision as of 15:40, 23 December 2022
, 15:40, 23 December 2022no edit summary
For a more visual explanation, take a look at the video made by Teltonika explaining the use-case of Jamming Detection: '''[https://www.youtube.com/watch?v=otQd34WqL54 Teltonika Jamming Detection scenario]'''
For a more visual explanation, take a look at the video made by Teltonika explaining the use-case of Jamming Detection: '''[https://www.youtube.com/watch?v=otQd34WqL54 Teltonika Jamming Detection scenario]'''
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{{{GNSS jamming1|
==GNSS Jamming==
GNSS Jamming is the transmission of radio signals that disrupts communications between tracker and satellites by decreasing the signal to noise ratio.
When a device detects GNSS signal jamming, it activates the GNSS Jamming scenario. The device then generates and sends a record to the server, depending on hardware model activates Digital Output and optionally sends SMS notification to configured GSM number. After device regains GNSS signal, Digital Output is immediately deactivated and a new record is sent to the server. This Digital Output activation can be used to trigger measures to disrupt potential thieves using GNSS signal jamming to steal your vehicle.
GNSS Jamming record is stored in AVL ID 318 parameter and has 3 possible values:
0 - No Jamming,
1 - Jamming warning status, which means that signal and accuracy is disrupted but device is able to hold GPS fix for at least 5 seconds.
2 - Jamming critical status, which means that device is not able to acquire GPS fix.
Worth mentioning, that Jamming Detection can go from any state to any other in 1 second intervals. It is completely dependent on received NMEA data by GNSS receiver. Therefore, it is possible in repeated jamming scenario for the state to rapidly go from 0 to 2 and backwards.
Also, GNSS Jamming functionality is capable to separate indoor areas (e.g. underground parking) from events when jamming is actually happening. This is possible because in-band jamming will affect internal PGA (Programmable Gain Amplifier) degrade, as a result, CNR (Carrier-to-noise ratio) will degrade as well. On the other hand, if CNR degrade is degraded only because of underground or signal covered, internal PGA gain will keep almost the same.
Note: GNSS Jamming is not available on 3.80, 3.82 GNSS modules. Available on 5.10, 5.1.5, 5.1.8 or newer modules. GNSS module version can be checked by SMS\GPRS command - getver
{{{dout_control_via_call_feature|==DOUT Control Via Call==
{{{dout_control_via_call_feature|==DOUT Control Via Call==