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GBT Dynamic Scheduling System (DSS). Dana Balser , Jim Braatz , Mark Clark, Jim Condon, Ray Creager , Mike McCarty, Ron Maddalena , Paul Marganian , Karen O’Neil, Eric Sessoms , Amy Shelton. Nomenclature. GBT Open Sessions Windowed Sessions Fixed Sessions. Butler. - PowerPoint PPT Presentation
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GBT Dynamic Scheduling System (DSS)
Dana Balser, Jim Braatz, Mark Clark, Jim Condon, Ray Creager, Mike McCarty, Ron Maddalena, Paul Marganian, Karen O’Neil, Eric Sessoms, Amy Shelton
Nomenclature
Butler
GBTOpen SessionsWindowed SessionsFixed Sessions
Observing
Scheduling Algorithm24-48 Hours in Advance
Scheduling Probabilities
Post-ObservationReports
Data CollectionAdvance of Semester
Reports of schedule,logs, time lost, etc
Phase IIdata
collection
Sensitivitycalculator
Timeavailabilityprediction
ProposalSubmission
Tool
Sciencegrades
How does it work?
Historicalprobabilities
Weatherforecasts
Monitor schedule
BackupProject run
Observingscripts
AutoschedulerRun
Scheduler modifiesand approves
Notificationsent
Provided outside the DSS
Provided by the DSS
Requirements• Scheduling observers, not
scripts•Observers retain control •Minimum of 24 hours advance notice for observers• Wide array of hardware•Cannot increase workload of staff or observers
Atmospheric Effects
Condon & Balser (2011)
Maddalena
Weather Forecasts
Atmospheric Stability
Maddalena; Balser (2011)Pyrgeometer: non-imaging device sensitive to 4.5-40 micron over 150 deg fov.
Wind Effects
Condon (2003)
21 v
21 v
Weather Forecasts: wind
Obs
Win
d S
peed
(m/s
)
Forecast Wind Speed (m/s)
Day
Night
Balser (2010); Maddalena
Solar Heating
rms330 micron
rms220 micron
Nikolic et al. (2007)
SurfaceWave front errors from OOF maps.
Grayscale: +/- 2 radContour: ½ rad intervals
Primary SurfaceDay: 300 micronNight: 250 micron
Offset PointingDay: 3.3 arcsecNight: 2.7 arcsec
R = (ηS Pαβ Pν
γ) (leff lHA lz ltr lst) (foos fcom fsg ftp)(tttntlettb)
Scoring Equation
Weather:
Observing EfficiencyStringency
Pressure Factors:
Right Ascension Frequency
Performance Limits:
Observing Efficiency Hour AngleZenith Angle
Tracking ErrorAtmospheric Stability
Other Factors:
Observers on SiteCompletion of Projects
Science GradesThesis Projects
Temporal Constraints:
Transit Nighttime
LST ExclusionTime Between
R = (ηS Pαβ Pν
γ) (leff lHA lz ltr lst) (foos fcom fsg ftp)(tttntlettb)
Scoring Equation
Weather:
Observing EfficiencyStringency
Observing Efficiency
s m 15.3
|v| arcsec
and ),/( f where;f)2ln(41
4ln(2)f 1
and ,])exp[-(4 where;) ( 32-exp
exp T)exp( T
4
1-2o
2tr
tr
2
2
2
tr
2asur
2a
2n
2d2
2
sur
2
sys
sysatm
trsuratm
Observing Efficiency
Stringency
R = (ηS Pαβ Pν
γ) (leff lHA lz ltr lst) (foos fcom fsg ftp)(tttntlettb)
Scoring Equation
Pressure Factors:
Right Ascension Frequency
Pressure Factor
d
nln 1 P
R = (ηS Pαβ Pν
γ) (leff lHA lz ltr lst) (foos fcom fsg ftp)(tttntlettb)
Scoring Equation
Performance Limits:
Observing Efficiency Hour AngleZenith Angle
Tracking ErrorAtmospheric Stability
Observing Efficiency Limit
Hour Angle Limit
Condon & Balser (2011)
Tracking Error Limit
errors)flux (10% 0.20 / f tr
Balser (2011); Mason & Perera (2010)
Atmospheric Stability Limit
Packing (Open Sessions)
Problem: a thief with a bag of capacity N, faced with a number (M) of possible goodies each having a different weight (cost) and value, how do you pack your bag to maximize your take?
Brute Force: order (M!)Knapsack Algorithm: order (M*N)
N = number of quarter hours to scheduleM = number of potential sessionsOverhead = 15 min.
Sessoms
Scheduler Page
Schedule
User Home Page
User Project Page
Fini