I was using pix hawk with Ardupilot : I want to know which frame of reference is used in pix hawk - Ardupilot - H configuration
when I am observing the valued in the logs the Acceleration Z is showing -10m/s^2
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The ArduPilot uses a NED (North-East-Down) axial orientation. This tells you which direction gives a positive value. If you see a negative Z value, that would indicate the Quad is taking off. When landing you should see a positive value. Note that these 'directions' are based on the orientation of the PixHawk in relation to the Quad itself. So 'North' would be the front of the Quad.