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Fig. 5. Instantaneous motion of the unicycle model. The two empty circles
correspond to the two retroreflective markers that are used to locate the
position of the POR (denoted as two concentric circles). v is the
forward velocity;
is the rotational velocity;
v
is the component of the velocity of the rear
marker perpendicular to the body's foreaft axis;
is the
distance between the rear marker and the POR.