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IES Operations. P. Mokashi IES Team Meeting, SwRI 29 May 2013. Uplink development during cruise. Uplink development for comet phase. Science & Operations Planning. Science Ground Segment System. Two main subsystems Observation Management Subsystem (OBM)

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ies operations

IES Operations

P. Mokashi

IES Team Meeting, SwRI

29 May 2013

science ground segment system
Science Ground Segment System
  • Two main subsystems
    • Observation Management Subsystem (OBM)
      • Used to define instrument campaigns, observations and their associated planning, trajectory, attitude and resource characteristics and constraints
    • Science Planning and Scheduling Subsystem (SPS)
      • Automated scheduling and timeline generation based on definitions, constraints and priorities using JPL’s ASPEN system
      • Includes spacecraft dynamics and geometry models
  • Will generate activity timeline and instrument commanding
sgs system
SGS System
  • Features
    • Includes monitoring campaign capability
    • No ability to manually schedule observations
    • The only way to get them scheduled and at desired times is by changing the criteria (duration, frequency, geometric or other model based constraints, pointing)
    • Includes ride-along campaigns (or eventually will)
  • Status
    • Concept has undergone several changes
    • Very ambitious system and schedule
    • Present status of some components is uncertain
basic ies operation
Basic IES Operation
  • Would like to be on all the time (monitoring) in normal mode with some other RPC sensors
  • Burst mode
    • Would like periodic burst mode operations. All operating RPC sensors would like burst mode at the same time
    • Additional burst mode operations determined by trajectory and models, like boundary crossings
  • Data has to be collapsed significantly as bandwidth allocation for IES is very low, even in burst mode
    • Select the ranges and combine counts in adjacent energy/azimiuth/elevation bins
  • IES Operation is driven by mode tables
  • Each table defines
    • Normal or burst mode
    • Cycle length (128s, 256s, 512s, 1024s)
    • Selection of energies for data return
    • Collapse (sum) of counts in adjacent
      • Energies
      • Elevations
      • Azimuths
  • 13 tables can be stored on board
    • Trade time resolution vs energy resolution vs angular resolution
  • Internal sequences – programmable series of commands separated by delta times
  • Can call itself (loop) so a regular continuous sequence can be setup (example – cycle between 5 hours of normal mode and 1 hour burst mode OR cycle between high energy and angular resolution tables)
  • 8 macros stored on board of which 4 are available for customization
    • 1 being used for gain test
gain tests
Gain Tests
  • Gain Tests will be performed periodically to determine the nominal MCP operating voltages
  • How frequently?
  • Last gain test configuration:
    • ~17 min at each 2525V, 2550V, 2575V, 2600V and back to nominal voltage of 2500
post hibernation commissioning
Post Hibernation Commissioning
  • March 31 & Apr 1, 2013
  • Distance from earth 4.2 to 4.3 AU
  • OWLT: ~35 min
  • 18 hours total with Sun in FOV for most of the time
  • Science data expected near real time (with light time delay)