aquarius mission simulation a realistic simulation is essential for mission readiness preparations...
TRANSCRIPT
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Aquarius Mission Simulation
• A realistic simulation is essential for mission readiness preparations
• This requires the ability to produce realistic data, containing observations similar to expected flight data, with the correct volumes and structures.
• This data will be generated on an ongoing basis, over periods of months, to test the entire ground data processing system.
• Such a simulation has been proven to increase the success of the mission by exposing problems well in advance of launch.
• It can also be used to test alternative processing approaches.
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SeaWiFS Heritage
• The SeaWiFS Project developed a realistic data simulation based on CZCS data and the sensor operations scenario.
• The simulation was configured to run daily, starting from a simulated orbit and sensor command schedule, through end-to-end processing of the data with the production system.
• This mission simulation was run continuously for 18 months prior to the SeaWiFS launch, uncovering many bugs and allowing major refinements in the processing system.
• As a result, SeaWiFS was able to produce scientifically credible data products from the very first sensor observations on September 4, 1997.
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Mission Simulation Requirements
• A useful mission simulation requires:– Simulating sensor output starting from realistic
geophysical values with sufficient fidelity to exercise “all” logical paths in the data processing algorithms
– Simulating sensor downlink data in the correct format and the expected data rates and volumes
– Simulating realistic data collection scenarios– Use of operational data processing software and
formats– Use of actual ancillary data sets wherever possible– Ability to generate one day of data per day.
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Mission Simulation Requirements (cont.)
• It does not necessarily require:– Simulating every aspect of the data path (e.g.,
surface-to-instrument, sensor operation) with maximum possible fidelity
– Simulating 100% of the sensor output (e.g., housekeeping telemetry not required by science algorithms) or dynamics
– Ability to incorporate anomalous behavior
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Aquarius Mission Simulation Flow
Simulated Orbit
Salinity Map
Input File
IntermediateData
PersistentData
Output File
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Aquarius Mission Simulation Flow
Simulated Orbit
Salinity Map
Input File
IntermediateData
PersistentData
Output File
Data CollectionScheduler Downlink
Schedule
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Aquarius Mission Simulation Flow
Simulated Orbit
SurfaceMeasurements
Salinity Map
AncillaryData
Sensor Geometry& Timing
RadiativeTransferModel
SensorMeasurements
Input File
IntermediateData
PersistentData
Output File
Data CollectionScheduler Downlink
Schedule
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Aquarius Mission Simulation Flow
Simulated Orbit
SurfaceMeasurements
SensorTelemetry
SensorOutput
DN
Salinity Map
AncillaryData
Sensor Geometry& Timing
InstrumentModel
RadiativeTransferModel
Data CollectionScheduler Downlink
Schedule
SensorMeasurements
Input File
IntermediateData
PersistentData
Output File
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Aquarius Mission Simulation Flow
Simulated Orbit
SurfaceMeasurements
SensorTelemetry
SensorOutput
DN
Salinity Map
AncillaryData
Sensor Geometry& Timing
InstrumentModel
RadiativeTransferModel
Data CollectionScheduler
ICDS Simulator
Sensor Memory
Simulator
ScienceBlocks
DownlinkSchedule
SensorMemory
SensorMeasurements
Input File
IntermediateData
PersistentData
Output File
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Aquarius Mission Simulation Flow
Simulated Orbit
SurfaceMeasurements
SensorTelemetry
SensorOutput
DN
Salinity Map
AncillaryData
Sensor Geometry& Timing
InstrumentModel
RadiativeTransferModel
ICDS Simulator
Sensor Memory
Simulator
ScienceBlocks
SensorMemory
SensorMeasurements
Input File
IntermediateData
PersistentData
Output File
Data CollectionScheduler
Spacecraft TelemetrySimulator
DownlinkSchedule
SpacecraftTelemetry
EphemerisFile
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Aquarius Mission Simulation Flow
Simulated Orbit
SurfaceMeasurements
SensorTelemetry
SensorOutput
DN
Salinity Map
AncillaryData
Sensor Geometry& Timing
InstrumentModel
RadiativeTransferModel
Data CollectionScheduler
ICDS Simulator
Sensor Memory
Simulator
Spacecraft TelemetrySimulator
SpacecraftDownlinkSimulator
ScienceBlocks
DownlinkSchedule
SensorMemory
DownlinkFiles
SpacecraftTelemetry
SensorMeasurements
Input File
IntermediateData
PersistentData
Output File
EphemerisFile
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Aquarius Mission Simulation Scenario
• Simulated orbit (e.g., from TLEs) is used with the station coordinates to generate a daily data downlink schedule.
• Simulated orbit is used with the sensor geometry and timing and the global salinity map to generate surface observations and viewing geometry.
• Surface observations are combined with geometry, radiative transfer model and ancillary data to generate sensor observations.
• “Simplified” instrument model (with required engineering telemetry) is used to produce sensor output values (DN).
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Aquarius Mission Simulation Scenario (cont).
• Sensor values and telemetry are formatted into science blocks.
• Science blocks are accumulated in “onboard memory” according to data collection/memory management scenario.
• Critical spacecraft telemetry (navigation) is formatted into spacecraft telemetry blocks at the specified sampling rate.
• Aquarius memory and spacecraft telemetry are “downlinked” at specified times according to downlink strategy (i.e., multiple Aquarius transmissions) and staged at CONAE.
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Aquarius Mission Simulation Scenario (cont).
• Aquarius file is preprocessed at CONAE using ADPS-provided system.
• Aquarius and spacecraft files are acquired by ADPS.• ADPS processes Aquarius and spacecraft data to
levels 1A, 1B , 2 and 3 in mission product formats using operational data system, product generation software and ancillary data.
• ADPS generates matchups and provides to AVDS.• Aquarius GS and Science team compare mission
products with original source files.• Repeat daily until launch!
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Implementation Stages
• Initial simulation efforts would involve single orbits, downlinks and days to verify formats, interfaces and software.
• Spacecraft telemetry would use interim formats or best available information until SAC-D formats are finalized.
• CONAE interactions would be exercised after internal ADPS verification.
• Objective is to have full-up mission simulation running daily no later than L – 1 year.
• The simulation fidelity can always be improved once the basic mechanics are functioning.
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Possible Improvements
• Simulated cold-sky maneuver.• Multiple downlink stations• Incorporate instrument characterization test results• Incorporate various noise and error models• ?