Civil Engineering Reference
In-Depth Information
A global time reference is maintained as a general reference, and
denotes the time when the phase
ends, relative to this global reference.
The phase shift operator,
illustrated with the help of Figure 7.7, is defined
as follows:
Note that always takes on positive values, and acts as a readjustment factor
in going from one time zone to another. Specifically, when
is subtracted
from a time point in the current time zone of
it changes the frame of
reference to the local time zone of
The clock is required to satisfy the following constraints:
The constraints (7.4), (7.5), (7.7) and (7.8) follow from the definition of the
clock. The constraint (7.6) maintains an ordering of the phases, and (7.9)
ensures that the phases are nonoverlapping. The last of these may be relaxed
in case of an overlapping clock.
