An array of accelerometers fixed with respect to one another may detect {HEAD ~ acceleration} in {TAIL ~ sufficient orthogonal directions} to accurately describe the movements of the array when the accelerations are doubly integrated 
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An array of accelerometers fixed with respect to one another may detect { HEAD ~ acceleration } in { TAIL ~ sufficient orthogonal directions } to accurately describe the movements of the array when the accelerations are doubly integrated
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH