 Theoretical discussion and field tests illustrate their feasibility and equivalence in overall positioning performance, which have the maximum horizontal position drifts  less than 2\% of the total travelled distance.
<meaning-changed>  Theoretical discussion and field tests illustrate their feasibility and equivalence in overall positioning performance, which have the maximum horizontal position drifts  less than 2\% of the total travelled distance.
 Theoretical discussion and field tests illustrate their feasibility and equivalence of the three measurements in terms of the overall DR performance. The maximum horizontal position drifts less than 2\% of the total travelled distance.