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Systems Engineering (plus Data, Digital, Power)

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Presentation on theme: "Systems Engineering (plus Data, Digital, Power)"— Presentation transcript:

1 Systems Engineering (plus Data, Digital, Power)
Bob Goeke

2 Who Am I? Recent history: Project Engineer for Currently:
RXTE: All Sky Monitor and Experiment Data System (in year 10 of operation) Chandra: CCD spectrometer (in year 6 of operation) VOILA: a virtual reality experiment on ISS; cancelled last Fall. Currently: Chief Engineer for Center CRaTER Project Engineer

3 Engineering Web Site <http://snebulos.mit.edu/projects/crater/>
Configuration Data Base Repository for all past and present controlled documents, drawings, parts, etc. Upload capability for ECOs and general info Report generator Reference Documents

4 CRaTER Conceptual Design

5 CRaTER Block Diagram

6 CRaTER Coincidence Logic
Detector geometry and coincidences between detector signals allow for determination of “good” versus “bad” particle event “Good” event is one in which pathlength through stack is well-determined and from which LET can be determined

7 Flight Resources Mass Best Estimate Power Best Estimate Data
Proposal: 4.3Kg Current WAG: 4.5Kg + x from Guilio Power Best Estimate Proposal: 4.6W Current WAG: 4.2W + A/D converters Data Typical: 400bps Flare: 100Kbps

8 Data System Requirements
1553 interface to spacecraft CCSDS packets to data system 12 bit resolution of science data Flexibility to handle detector noise Flexibility to handle data rates Flexibility to handle event selection

9 Thermal System Not staffed up yet.
With single layer MLI over both apertures and multilayer elsewhere, not a difficult problem. Six feet through which to conduct heat. Curious as to what thermal environment is predicted (hot is noisier for detectors than cold).

10 Flight Operations Instrument has one operating mode (currently 16 bytes of configuration data) CCSDS packets up and down Internal calibration is a single command External (flight) calibration is the regular operating mode, pointed off nadir. Will request real time engineering data feed.

11 Current Issues Power Field-of-View and Accomodations
Overhead cost of regulated power supplies Rad-hard A/D converters Field-of-View and Accomodations Telemetry architecture Reserved bandwidth for specific event classes? SEU error handling

12 Questions What is the schedule for Instrument ICDs?
When will we see the Contamination Control Plan? Who is our contact for radiation info on parts?

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