How to fix the fact that the use of a GPS jammer?

Hello!
I'm trying to find a method of registering cases of the use of GPS jammers signal, to check hired drivers. It seems that everything is Internet reviewed, but found nothing, except a suspicious device without feedback from the company "Hello the 90s, you'll write a website in Notepad". Was thinking about using a mobile phone with the appropriate software, but this is not the best option, as it will need to connect to the vehicle network.
Who is associated with the systems of satellite monitoring of transport, as you catch the clever guys with the jammers?
June 10th 19 at 14:58
4 answers
June 10th 19 at 15:00
Comes to mind is to measure the signal level at the desired frequency of a single module. Not that engineering is a difficult task, given that we do not care on the signal itself, the important thing is to evaluate its capacity in parrots. GPS antenna, primitive RF amp, Arduino - normal GPS signal will be near zero in this thing, but the signal jammers will be well-defined - she thrashes many orders of magnitude more powerful than the real signal. For more than 30 seconds is detected by the obstacle - cut siren, turn off the engine. Module to put under the hood to not found.
I can even advise those who make the series.
Cool idea - the man drives the car, the car stalls in the middle of a busy road at speed, failing power steering, and other useful things.
Well, will carry on the way, a couple of cars - but without control not going anywhere. - earl.Weissnat commented on June 10th 19 at 15:03
Ilya, you got that right. Maybe you know about those already made series? I only have 200 drivers, they are 2-3 Shaitan-box enough, so I'm afraid, custom devices not in this case. - Loyal.Price76 commented on June 10th 19 at 15:06
this is for example. Generally, in the ideal case, such detectors are nothing to do should not only record the fact that the use of jammers. At the end of the month respectivas list of applications jamming signal, the indications of the tachograph during this time (I don't think they are that twisted), and the driver asks a direct question - what was he doing at this time. Let for each jamming explanatory writing. Found in next month this amazing thing to apply administrative methods.
Very niche and cheap device comes. Hardly it exists separately. - julie_DAmore commented on June 10th 19 at 15:09
June 10th 19 at 15:02
Everything has been invented.
Since the problem of jamming is not new, there are already solutions that are integrated in GPS receivers. For example, there is a module GMM-U5J which are designed specifically for fleet management and have not only built-in system, allowing, to a certain extent, reduce the efficiency of interference, but also to issue a warning that there is interference with the signal. Read that datasheet.
Good module, thanks for the link! Showed the dealer, they "must see".
But the module is good, would be great. - earl.Weissnat commented on June 10th 19 at 15:05
June 10th 19 at 15:04
It is enough to analyze:
1. track compared to other drivers, as well as the previous tracks this driver
2. the duration of loss of signal and the coordinates of the before/after. If you have realtime monitoring, then after N minutes to call the driver on the phone "where are you?". If not realtime, then after to arrange a debriefing.

Don't forget to take into account the real loss of signal near the Kremlin/the airport (coordinates before/after), the tunnel (coordinates before/after + Andexplore), in the underground garage (for coordinates before/after + time on the invoice), etc.
Boris, good day,
All of the above is done, the problem is that drivers in one organization, supervisors in another, the operator control in the third. While the driver was caught "red-hand", no circumstantial evidence it is not moving. According to the monitoring data already compiled a list of drivers who use silencers. Left point in their car to establish a miracle-the device, which the driver can be removed and it in a human voice say - "Ivanova I. And quartered with the introduction of a personal matter".
A device like this and wanted. - earl.Weissnat commented on June 10th 19 at 15:07
June 10th 19 at 15:06
to fix the fact that the use of a GPS jammer?
No way.
The signal may be lost by natural causes - dense buildings, a tunnel. the high level of noise in the air at close frequencies.

You can only record the fact of loss of GPS signal.
Need to fix the time, not when he goes missing, it becomes several orders of magnitude stronger than the entire band. Why "no"? - earl.Weissnat commented on June 10th 19 at 15:09

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