General topics » Satellite drift

The 1250 RS came with a Datatag Trakking tracker fitted as standard. Over the one month of ownership I have had 2 false alarms saying bike was being moved without the ignition being on. Each time I was miles away from home and a phone signal and the tracker folk could not get me on my mobile. I was advised to have a neighbour as a second point of contact for such occasions but do not want him to receive false alarms. On both occasions the bike was safely in my garage. Datatage inform me this is due to 'satellite drift' over which they have no control. The drift gives the impression that the bike is moving when it is the satellite that has drifted. Is this a problem other 1250 owners are having and is there a solution apart from removing the tracker.

Interesting. But there is not just a problem with satellite drift. Someone on this site reported a different problem - reports of bike movement with the engine off when travelling on a ferry!

Methinks that the tracker company need to tone down their sensitivity!!

Chris

Similar issue with mine, happened twice now, appears to be caused by lack of satellites locked on to, in my case only three as its in an integral garage, so poor reception, if one drops out it does it’s best with two, plus phone network triangulation, but the relocation triggers a “move” and an alarm signal, so I turned on the the text movement early warning, to confirm if its real or not, and intend installing another camera in the garage for when we are away.
Suspect that there is a slightly faulty satellite up there somewhere that drops out or reduces output every so often as the tracker (another make) on my car also relocated the car into a nearby road at a similar time, either that or someone is playing with gps jamming In the vicinity! The car lives outside in the open, although there are a few trees about. Only happened twice since March
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Unless survey quality GPS equipment is used (often doubled up to further improve accuracy), plus minus 10mt is your average consumer GPS error one can expect. People seem to have this impression that you can plot yourself walking down the street - it may look like that on your device but thats down to complex averaging algorithms in your device. Perversely, a static reciever is the most prone to errors. Also, GPS network goes wrong all the time with greater than normal errors. I work for the UK navigation authority and we provide an enhanced GPS service so we continuously monitor the global GPS system with regard to the UK and one of the worst 'errors for 12 hours was over 60 miles.......!! Its not remotely infallable

Zitat von wessie im Beitrag #3

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More likely they skimped on the receiver so that it cannot detect the required signals when they are degraded by environmental factors such as buildings; weather or a delivery truck. Do you have any large trees near your garage? The canopy will degrade the signal a lot more on wet or windy days.

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Presumably when a satellite "drifts" it effects every tracker locked onto that satellite... so either a load of their vehicles are suddenly being stolen or there's a glitch. My only guess is that they have sold too few trackers to make such a deduction.

Steviejuk The Best answer so on this blog so far Thanks

GPS relies on a very precise clock signals and delay signals from different satellites to compute location. The more satellites seen give you better results. as one or more drop out or fade in the location is recomputed...is seen by the user as drift.

Cell phone fudge this more by doing similar things(via algorithms) using local cell towers.

I had this problem a lot with my bike parked in my garage where it obviously gets a pretty poor GPS signal. I have a BikeTrac tracker, and the solution was to set a 200 metre square geofence area so that no alerts are generated unless the tracker thinks the bike has completely left the area.