Changes

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.

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:

GNSS Jamming record is stored in AVL ID 318 parameter and has 3 possible values:

0 - No Jamming,

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.

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.

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.

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.

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

'''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

'''Note that this scenario will not work with [[{{{model|FMB1YX}}}_Sleep_modes#Deep_Sleep_mode|Deep Sleep]], [[{{{model|FMB1YX}}}_Sleep_modes#Ultra_Deep_Sleep_mode|Ultra Deep Sleep]] and [[{{{model|FMB1YX}}}_Sleep_modes#Online_Deep_Sleep_mode|Online Deep Sleep]] modes, since they disable the device's GSM module to save power.'''

'''Note that this scenario will not work with [[{{{model|FMB1YX}}}_Sleep_modes#Deep_Sleep_mode|Deep Sleep]], [[{{{model|FMB1YX}}}_Sleep_modes#Ultra_Deep_Sleep_mode|Ultra Deep Sleep]] and [[{{{model|FMB1YX}}}_Sleep_modes#Online_Deep_Sleep_mode|Online Deep Sleep]] modes, since they disable the device's GSM module to save power.'''