vatger/aman-sys
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix bugs in TTL and TTG calculations

Browse Source
This commit is contained in:
Sven Czarnian
2021-11-24 12:05:03 +01:00
parent f359ec8189
commit 06974b807c
1 changed files with 17 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
aman/sys/aco/Node.py
View File

@@ -176,12 +176,23 @@ class Node:
if None != star:
flightTime, trackmiles, arrivalRoute = self.arrivalEstimation(identifier.Runway, star, weatherModel)
avgSpeed = trackmiles / (float(flightTime.seconds) / 3600.0)
# the closer we get to the IAF the less time delta can be achieved by short cuts, delay vectors or speeds
ratio = min(2.0, max(0.0, self.PredictedDistanceToIAF / (trackmiles - self.PredictedDistanceToIAF)))
possibleTimeDelta = (trackmiles / (avgSpeed * 0.9)) * 60
ttg = timedelta(minutes = (possibleTimeDelta - flightTime.total_seconds() / 60) * ratio)
ttl = timedelta(minutes = (possibleTimeDelta - flightTime.total_seconds() / 60))
# calculate average speed gain
avgSpeed = trackmiles / (flightTime.total_seconds() / 3600.0)
avgSpeedIncrease = avgSpeed * 1.10
avgSpeedDecrease = avgSpeed * 0.80
decreasedSpeedFlighttime = (trackmiles / avgSpeedDecrease) * 3600.0 # given in seconds
# calculate shortcut gain and add 15 miles for final and base turn
currentPosition = Waypoint(latitude = self.PredictedCoordinate[0], longitude = self.PredictedCoordinate[1])
shortcutDistance = currentPosition.haversine(identifier.Runway.Start) + 15.0
shortcutFlighttime = (shortcutDistance / avgSpeedIncrease) * 3600.0
if shortcutFlighttime > flightTime.total_seconds():
shortcutFlighttime = flightTime.total_seconds()
# the best TTG is the shortest path with the fastest speed
ttg = timedelta(seconds = flightTime.total_seconds() - shortcutFlighttime)
# the best TTL is the longest path with the slowest speed
ttl = timedelta(seconds = decreasedSpeedFlighttime - flightTime.total_seconds())
ita = self.Inbound.ReportTime + flightTime
earliest = ita - ttg
latest = ita + ttl