and wherein the processing arrangement is arranged to apply an harmonic analysis to signals corresponding to at least one of the pressure and the acceleration, the harmonic analysis being arranged to identify harmonic components in respect of {HEAD ~ angular frequency} corresponding to {TAIL ~ a temporal rate} of change of the angular orientation of the at least one wheel 
and wherein the processing arrangement is arranged to apply an harmonic analysis to signals corresponding to at least one of the pressure and the acceleration , the harmonic analysis being arranged to identify harmonic components in respect of { HEAD ~ angular frequency } corresponding to { TAIL ~ a temporal rate } of change of the angular orientation of the at least one wheel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH