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Simon,<br>
Try using anti vibration mounts.<br>
I too have seen the effect of a sharp tap on the ublox earlier
units.<br>
Regards<br>
Anthony Wooldridge<br>
<br>
<div class="moz-cite-prefix">On 01/09/2015 21:03, Felipe G.
Nievinski wrote:<br>
</div>
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cite="mid:CAGXn2T2rJ25D8F6ofA6ULKNpYZs=xqbo5uNck+0nqKTgoOABRw@mail.gmail.com"
type="cite">
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Date:
Tue, 1 Sep 2015 13:05:25 +0200<br>
From: Simon Treny <<a moz-do-not-send="true"
href="mailto:simon.treny@gmail.com">simon.treny@gmail.com</a>><br>
To: Open Source GPS-related discussion and support<br>
<<a moz-do-not-send="true"
href="mailto:foss-gps@lists.osgeo.org">foss-gps@lists.osgeo.org</a>><br>
Subject: [FOSS-GPS] Shocks/vibrations on antenna and cycle
slips<br>
Message-ID: <<a moz-do-not-send="true"
href="mailto:C764E181-99B8-4B0F-9FB0-858E3684456B@gmail.com">C764E181-99B8-4B0F-9FB0-858E3684456B@gmail.com</a>><br>
Content-Type: text/plain; charset=us-ascii<br>
<br>
Hello all,<br>
<br>
I'm using RTKLib to perform RTK positioning using UBlox
M8T evaluation-kits (EVK). I have great results when the
GPS antenna is attached on the rooftop of a car driving on
a track (accuracy <10cm).<br>
But as soon as a I attach the EVK and the antenna on a
quad bike and drive on a bumpy road, the accuracy becomes
really bad (the distance between 2 antennas can be off by
>3 meters).<br>
In both cases, I have a clear view of the sky and no tree
or building around.<br>
<br>
By looking at the recordings with RTKPlot, I've noticed
that I get much more losses of lock when the antenna is on
the quad-bike/bumpy-road rather than on the car/track. My
guess is that the shocks caused by driving on the
bumpy-road causes these losses of lock. I've measured with
the accelerometer of my phone the acceleration on both the
car and the quad-bike: on the car, the vertical
acceleration never goes beyond 3g, while the vertical
acceleration on the quad-bike can go up to 8g.<br>
<br>
I've reproduced this observation by attaching the antenna
on a pole, and shaking the pole vertically. As soon as I
shake it, many losses of lock occur.<br>
If I do the same by attaching the EVK on the pole and
letting the antenna static on the ground, there is no loss
of lock (excluding the possibility that it comes from the
oscillator).<br>
<br>
Is this a known issue with low-cost receivers/antennas? Is
there a way to improve the situation? Are there other
low-cost receivers that support shocks or vibrations
better than the UBlox M8T?<br>
<br>
Cheers,<br>
Simon<br>
<br>
</blockquote>
<div> </div>
<div>The datashet says: "Operational limits: Dynamics ≤ 4
g"...</div>
<div><br>
</div>
<div><<a moz-do-not-send="true"
href="https://www.u-blox.com/sites/default/files/products/documents/NEO-LEA-M8T_DataSheet_%28UBX-14006196%29.pdf">https://www.u-blox.com/sites/default/files/products/documents/NEO-LEA-M8T_DataSheet_(UBX-14006196).pdf</a>><br>
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<div><br>
</div>
<div>-F.</div>
<div><br>
</div>
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