Technical Budgets Mass Power Pointing knowledge and accuracy

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Presentation transcript:

Technical Budgets Mass Power Pointing knowledge and accuracy T. Kamae F2F IDT 3/19/02 Technical Budgets Mass Power Pointing knowledge and accuracy Data downlink Fairing envelope Orbit (Heat)

Mass Budget (1) - Launcher, Observatory, S/C, LAT, GBM - T. Kamae F2F IDT 3/19/02 Mass Budget (1) - Launcher, Observatory, S/C, LAT, GBM -

Mass Budget (2) - Current Status of LAT Mass - T. Kamae F2F IDT 3/19/02 Mass Budget (2) - Current Status of LAT Mass -

Mass Budget (3) - Center of Mass above the S/C Interface - T. Kamae F2F IDT 3/19/02 Mass Budget (3) - Center of Mass above the S/C Interface - Max Height off the S/C interface for Center of Mass = 185mm

Mass Budget (4) - History and Release of Contingency - T. Kamae F2F IDT 3/19/02 Mass Budget (4) - History and Release of Contingency -

Mass Budget (5) - How well do we know? - T. Kamae F2F IDT 3/19/02 Mass Budget (5) - How well do we know? -

Power Budget (1) - LAT and GBM - T. Kamae F2F IDT 3/19/02 Power Budget (1) - LAT and GBM -

Power Budget (2) - Current Status and Breakdown - T. Kamae F2F IDT 3/19/02 Power Budget (2) - Current Status and Breakdown - * * ACD estimate under review May vary slightly

Power Budget (3) - History and Release of Contingency - T. Kamae F2F IDT 3/19/02 Power Budget (3) - History and Release of Contingency -

Power Budget (4) - How well do we know? - T. Kamae F2F IDT 3/19/02 Power Budget (4) - How well do we know? - Big uncertainties: Size of the radiator panels to dump the heat Heater to maintain the minimum temperature during Safehold mode Number of CPUs required for on-board data processing

Pointing Knowledge (1) - Nomenclature - T. Kamae F2F IDT 3/19/02 Pointing Knowledge (1) - Nomenclature -

Pointing Knowledge (2) - Allocation - T. Kamae F2F IDT 3/19/02 Pointing Knowledge (2) - Allocation -

Pointing Knowledge (3) - Absolute Pointing Accuracy - T. Kamae F2F IDT 3/19/02 Pointing Knowledge (3) - Absolute Pointing Accuracy -

T. Kamae F2F IDT 3/19/02 Pointing Knowledge (4)

Pointing Knowledge (4) LAT Alignment 18 March 2002 S. Ritz version 1.1 T. Kamae F2F IDT 3/19/02 Pointing Knowledge (4) LAT Alignment 18 March 2002 S. Ritz version 1.1 The total numbers of the track required for the inner- and inter-tower alignments are 2000 x 16 x 16 x16 = 8.0M tracks and 230K x 16 = 3.7M tracks, respectively. The total data size is (8.0M + 3.7M ) x 2 kB/event = 23.4 GB (2kB/event is tentative number and to be determined). Assuming 300kbps, it takes 9 days to send data to the ground. Tracker Alignment and Pointing Accuracy Eduardo do Couto e Silva and Hiroyasu Tajima SLAC February 26, 2002 (ver. 0.1) March 5, 2002 (ver. 0.2)

Data Downlink (1) - Latency - T. Kamae F2F IDT 3/19/02 Data Downlink (1) - Latency -

Data Downlink (2) - Volume - T. Kamae F2F IDT 3/19/02 Data Downlink (2) - Volume - From: Bartels, Arlin [mailto:abartels@staac-mail.gsfc.nasa.gov] Sent: Sunday, February 17, 2002 14:09 To: Steve Ritz Subject: RE: LAT IRD rev.A - final review copy prior to draft SC RFO Steve, I'm removing the TBR because I don't see the point of leaving it "unresolved". Since I'd be writing a CCR anyway at some point, either to remove the TBR or to change the number, the only reason to leave this as a TBR is to imply some uncertainty in the number being the correct one in the first. I'm not aware of any GLAST Project plans to ask the LAT to lower the LAT output below 26 Gb/24 h, so the TBR doesn't really apply. -Arlin LAT Science gets 300kbps but may not be more.

Data Downlink (3) - Storage - T. Kamae F2F IDT 3/19/02 Data Downlink (3) - Storage -

Fairing Envelope (1) - Specification - T. Kamae F2F IDT 3/19/02 Fairing Envelope (1) - Specification -

Fairing Envelope (2) - LAT Size - T. Kamae F2F IDT 3/19/02 Fairing Envelope (2) - LAT Size -

Fairing Envelope (3) - LAT in Delta II Capsule - T. Kamae F2F IDT 3/19/02 Fairing Envelope (3) - LAT in Delta II Capsule - See next page 1-zone Radiator Cut-outs for possible S.A. launch locks Hole to accommodate Solar Array mast VCHP reservoirs GLAST rotated 45 deg to clear PAF mounting bosses Radiator Mount Bracket at 4 corners of Grid LAT with updated Radiator package, 6935 PAF, and SC stay-clear volume in the Delta-II fairing

Fairing Envelope (4) - Constraints from GBM and Star trackers - T. Kamae F2F IDT 3/19/02 Fairing Envelope (4) - Constraints from GBM and Star trackers - 1796mm ?mm 1990mm 1851mm 2743mm Radiator panel ACD+MLI+MMS stay clear Shortest clearance 12.5mm Delta-II H Fairing Star tracker FOV?

Orbit and Attitude (1) - Coordinate Systems (1) - T. Kamae F2F IDT 3/19/02 Orbit and Attitude (1) - Coordinate Systems (1) -

Orbit and Attitude (2) - Coordinate Systems (2) - T. Kamae F2F IDT 3/19/02 Orbit and Attitude (2) - Coordinate Systems (2) -

Orbit and Attitude (3) - Specification - T. Kamae F2F IDT 3/19/02 Orbit and Attitude (3) - Specification -

Orbit and Attitude (4) - Body Coordinate System - T. Kamae F2F IDT 3/19/02 Orbit and Attitude (4) - Body Coordinate System -