Specifications

GEMINI
2
Traffic Outstation Handbook
667/HB/32600/000 Page 180 Issue 11
M = Fill Rate
Calculation Period
Current Occupancy
Expected Occupancy
Occupancy
Time
N
Historical Occupancy
Figure 26 – Extrapolation
If the state is FULL and the car park is emptying fast enough so that the ALMOST FULL
state would be reached in N minutes then status reports are sent to the Central Office
at X minute intervals (ramp down mode) where X is set to the ramp down period. The
first status report is sent as soon as the decision is taken to enter ramp down mode.
If the emptying rate changes so that the ALMOST FULL state would not be reached
within N minutes then status reports are no longer sent to the Central Office at X minute
intervals. If the occupancy reaches the almost FULL state, status reports are no longer
sent at X minute intervals.
The Historical Occupancy is calculated and stored at 1-minute intervals.