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Re: [Paparazzi-devel] Altitude estimation wiht BMP-sensor

From: Helge Walle
Subject: Re: [Paparazzi-devel] Altitude estimation wiht BMP-sensor
Date: Thu, 28 Jul 2011 23:22:54 +0200

Additional information to my last mail:
Testing was performed indoors on my work table.


2011/7/28 Helge Walle <address@hidden>

I plotted the pressure reading from my BMP085 with SENSOR_SYNC_SEND in my airframe file. During a few minutes plotting the average pressure seemed stable, while the max/min readings differed by approx. 1hPa.

While testing the same sensor with my Arduino board a few minutes later using one of the sample sketches from Sparkfun the max/min readings only differed by one third of that value.

I have not compared the codes for reading the sensor. Maybe there is a difference that should be looked into?


2011/7/28 Prof. Dr.-Ing. Heinrich Warmers <address@hidden>
we have same problems with the altitude estimation with the Bosch BMP-sensor in combination with the altitude filter:
The sensor signal gives a variance in altitude of up to +- 5m.
There is a delay of    2 to 3s of the sensor signal and the filter output so that the altitude feedback control systems becomes instable.
It looks like, that the altitude information from the GPS and the pressure sensor is mixed.


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