Calculating Offset and Accuracy

T2 = T1 + t + offset T4 = T3 + t’ - offset

2 offset -t’ + t = T3 - T4 + T2 - T1

EO = estimated offset = ( T3 - T4 + T2 - T1 ) / 2

accuracy = t + t’ ~ T2 - T1 - EO + T4 - T3 + EO

accuracy = T2 - T1 + T4 - T3

Example:

1 2 3 4 5 6 7 8 9

5 6 7 8 9 10 11 12 13

T1 = 5

T2 = 2

T3 = 8

T4 = 13

t, t’ = 1

EO = 4

accuracy = 2