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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
3-60 SECTION 3 - OPERATING INSTRUCTIONS
Table 3-7. Interval Conditions
Run schedule from 10:00 to 20:00UT
Run schedule from 10:00 to 10:30UT
Run schedule during daytime
Calculated individually for all
locations and days of year
Start schedule 30 minutes prior to day
start, finish schedule 1 hour past day end
Refer to foF2 daily plot to select
optimal day/night switch
Run schedule during nighttime
Calculated individually for all
locations and days of year
Refer to foF2 daily plot to select
optimal day/night switch
Start schedule 10 min after previous con-
dition in the list, stop after 30 min of op-
eration
Start schedule after 10 iterations of previ-
ous schedule and run 20 iterations of cur-
rent schedule
NOTE
Start times suggested by planning rules that use Day and Night conditions, as well as their boundaries
Start and End, are subject to “Snap to UT grid” analysis that shifts the start time to the nearest end of
previous schedule iteration, so that the SST planner does not interrupt schedules in the middle.
COMBINING PLANNING RULES IN THE RULES TABLE
3:110. The Rule Table can have multiple rules with start and interval conditions, and one default rule. As a
minimum, the Rule Table has to have one rule which is not the default rule, in which case no schedule switch-
ing is occurring, and the sounder remains in the schedule specified in the rule indefinitely. There is no start or
end time associated with the default rule; it is a fallback rule that will define operation if there is an absence in
the schedule not described by other rules. It is for this reason that if there is only a single rule in the Rule Ta-
ble, it cannot be the default rule.
3:111. When more than one planning rule is specified in the Rule Table, DCART planning algorithm parses
the rules to calculate SSTs within the day period. It is possible that more than one condition applies to the same
period of time of day, in which case planning algorithm considers rule priority (rules placed higher in the Rule
Table have higher priority). The planning algorithm concepts can be summarized as follows:
• Schedule with a start condition finishes as soon as another condition starts.
• Schedule does not start if another schedule is running with a higher priority interval condition.
• When schedule with interval condition finishes, new running schedule is selected as the highest priority
schedule applicable.
• Default schedule has lowest priority.
3:112. Table provides two examples of priority analysis.
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