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Twitchy GPS Track

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Jan 4, 2017
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Has anyone else noticed their telemetry GPS tracks being super-twitchy? The H is flying really well and smooth, but the tracks are really rough.

Below is a section of a flight I did yesterday, and if you look at the total distance of the GPS log it's a quarter mile, but in reality it's just a little over 500 feet. This was a pretty fast run, and the H was rock-solid in flight.

I wonder if this has anything to do with the low-speed twitches that've been bugging me.

Is this typical in your experience, or should I look at replacing my GPS module?

Screenshot_032617_113616_AM.jpg
 
R

Rayray

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I don't know, but the ver.1.35 Autopilot firmware is much smoother, better, close to the ground and landing. After the update, re-cal the Accelerometer.
 
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I don't know, but the ver.1.35 Autopilot firmware is much smoother, better, close to the ground and landing. After the update, re-cal the Accelerometer.
Yeah, I re-calibrated everything after the update. I agree landing is a lot smoother post-update, and the update went without a hitch. This particular issue's been there since day 1 (early January when I bought the H), and it doesn't seem to affect normal flight at all; the thing's smooth as silk (with large-ish stick deflections) and generally rock-solid in hover. It's just when making small adjustments (like trying to move a couple feet in hover) that it gets really twitchy. It seems, at least in my case, like there's no filter/smoothing on the GPS data and I was wondering if anybody else has seen this in their track logs.
 
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How many satellites does your controller see? I'm wondering if the GPS signals are from separate satellites switching as you move along. Just a guess, but maybe that's a clue.
 
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This flight had 18-20, which is fairly typical. In going back through all my telemetry files (50 or 60) I'm seeing they're all like this. More of a curiosity than anything. Just wondering if others have seen the same thing when they look at gpx exports of their log files...
 

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