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Re: [Paparazzi-devel] Lisa/M v2 +Aspirin IMU loss

From: Balázs GÁTI
Subject: Re: [Paparazzi-devel] Lisa/M v2 +Aspirin IMU loss
Date: Thu, 18 Sep 2014 21:41:48 +0200
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thank you for the ideas! I don't think that the sunlight caused the phenomena, because the hardware never was exposed to direct sunlight (8/8 cloud coverage) and in addition our Aspirin IMU is placed directly on the bottom side of the Lisa module.

I would be eased if somebody could report similar experience by high sun activity, because on Sept. 12th, a CME hit Earth's magnetic field, igniting the most intense geomagnetic storm of the year. (

If no similar feedback, then we should conduct further detailed analysis to find the ghost hidden in the system. :)


2014-09-18 21:05 időpontban Prof. Dr.-Ing. Heinrich Warmers ezt írta:
the pressure sensor reacts of sun light.
Is that the problem?
You have to cover them in same foam.
Is the IMU connected separate with same wires?
The 168MHz  prevent sometimes well GPS signals.
Therefore it is always a  good way to make a shield of metal
and use ferrite rings on all wires from and to the autopilot.

Sometimes the sensor element mpu6000 is defect.

Regards Heinrich

Balazs GATI schrieb:

Hi all,

yesterday we experienced the total loss of attitude calculation of a Lisa/M v2 (quadshot) with Aspirin IMU in open air. (I mean the artificial horizon went wild after we left the building.) Fortunately we didnt want to fly, but test the GPS. Finally we could identify the problem: the IMU worked only if we provided some kind of physical cover to the module. Steel and aluminium sheet, thick paper worked. (80g/m2 copy paper and pure hand don't.) We could explain the phenomen with the increased sun activity or with some strange failure in grounding.

Have you got similar experience in the last few days?


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Balazs GATI, PhD
associate professor
Department of Aeronautics, Naval Architecture and Railway
Budapest University of Technology and Economics

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