Replies to This Discussion

Permalink Reply by Zachary Eldridge on August 20, 2012 at 12:20pm

Has anyone tried to shield the gps cable?

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Permalink Reply by Greg Fletcher on August 20, 2012 at 1:21pm

It's not a shielding issue. It has to do with the AHRS using GPS velocty readings. When I took my set up outdoors the twitching stopped. It doesnt matter if you have a good 3d lock indoors. Mulipath reflections of the GPS signals couse unreliable insantanius velocity readings which filter though the attitude calculations.

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Permalink Reply by Andke on August 20, 2012 at 1:37pm

I've been testing outside. (just over ground level, no electronics - only USB power, APM2.5, GPS)

- powering by external, stable 5,5v does not improve it.

- There were less shaking in the open, but not "perfect"

now I got more questions:

1.-It seems flying near buildings , and indoors, (if any fix) - will be unstable

2.- how will the "gps velocity readings" be affected by big airframe, or other electronics that could give reflections ?

3.- doing aerobatics, inverted flight, I guess the GPS could go even more crazy ? - or not ?

4.- why does AHRS need to use the GPS "so fast" ? - I understand to cancel drift, but this fast response ?

5.- mikrokopter are using basically the same GPS module and I don't remember to have seen AHI jump around.

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