GPS glitching

[Asaad_civic99]

Hi,

I have the following setup:
S500 quadcopter frame
Pixhawklite flight controller
Turnigy 2830 1000 kv motors
Afro 30 amp ESCs
NEO-6m GPS with built in external compass.
Firmware version: 3.2.1

I had the above electronic components in an X525 frame and it flew fine. Then I moved all components to the S500 frame. In the maiden, mission planner showed "No GPS". I found that one of the wires coming from the GPS into the board was loose. Went home, fixed the problem, and then tried again the following week. Everything seemed fine at start up, mission planner showed "3D Fix". I took off and switched to loiter, seemed fine but not as locked in as before. Pushed the elevator stick forward and the quadcopter moved forward but not smooth and showed hesitation in forward flight. when I released the stick, the copter moved back and forth.

The logs show several GPS glitch messages although the number of satellites was 12 most of the time and HDOP was between 0.7 & 0.8 which I thought was unusual because in the previous frame it was averaging 2.0.

I checked all GPS connections and they seem fine. What is wrong with my GPS?

[rsmith21]

I know nothing about your FC but in this post the user set his  manual magnetic declination setting ,  http://www.multi-rotor.co.uk/index.php?topic=12955.0

[Static65]

How is the GPS receiver positioned? I had mine on the top of one of my frames next to the battery and was getting multiple glitches. I stuck it on top of a 100mm or so pole and it cleared the glitching. Vibration remained an issue, it was messing with the IMUs and throwing up EKF errors, once I sorted that it flew like a dream. Have you checked for vibration in your logs? It throws up more errors than you might think that wouldn';t seem directly related.

[Asaad_civic99]

I have a 3D fix and my vibrations are well below the maximum. I tried another GPS unit and it worked fine. It seems that the old GPS unit has became faulty but it shows 3D fix and low HDOP.

thank you both