Patent ID: 6032108
Filing Date: 2000-02-29
Classification: A63B,G01S

Abstract:
A system for determining kinematic measurements along a course traveled by a person, comprising:means for attaching the system to the person, said system having means for receiving signals from a set of global positioning satellites which are subject to selective availability errors purposefully introduced into the signals, said signal receiving means being capable of receiving signals at each point of a plurality of points along the course from a sub-set of said global positioning satellites;means for processing the signals received at each point to determine an earth-centered-earth-fixed (ECEF) fix of each point in x, y, and z planes relative to the earth's center, wherein any selective availability errors in the ECEF fixes processed from signals received from the same sub-set of satellites at successive points along the course are effectively canceled out by calculation of relative kinematic measurements for the successive points;means for determining when the signals received at a current one of the plurality of points is received from a different sub-set of satellites than the sub-set of satellites from which signals are received at an immediately preceding point, wherein a jump error may be introduced in the fix for the current point as compared to the fix for the preceding point when they are obtained from different sub-sets of satellites;means for correcting the lump error in the ECEF fix at the current point at which the determining means determines that signals are first received from the different subset of satellites; andmeans for calculating relative kinematic measurements for segments between the ECEF fixes of each pair of sequentially adjacent points with any jump error between fixes being corrected by said jump error correcting means.