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RAFT Radar Fence Transponder Phase 0/1 Safety Review 16 Dec 04

RAFT Radar Fence Transponder Phase 0/1 Safety Review 16 Dec 04. Bob Bruninga, PE MIDN 1/C Eric Kinzbrunner MIDN 1/C Ben Orloff MIDN 1/C JoEllen Rose. RAFT Team. Spacecraft (US Naval Academy) Bob Bruninga (PI) MIDN 1/C Eric Kinzbrunner , MIDN 1/C Ben Orloff, MIDN 1/C JoEllen Rose

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RAFT Radar Fence Transponder Phase 0/1 Safety Review 16 Dec 04

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  1. RAFTRadar Fence TransponderPhase 0/1 Safety Review 16 Dec 04 Bob Bruninga, PE MIDN 1/C Eric Kinzbrunner MIDN 1/C Ben Orloff MIDN 1/C JoEllen Rose

  2. RAFT Team • Spacecraft (US Naval Academy) • Bob Bruninga (PI) • MIDN 1/C Eric Kinzbrunner , MIDN 1/C Ben Orloff, MIDN 1/C JoEllen Rose • Launch Integration (Space Test Program) • Chief Of Integration & Ops: Capt Yvonne Fedee • Payload Manager: Mr Perry Ballard • Back Up Payload Manager: Lt Reann Caldwell • Payload Integration Engineer(PIE): Mr Carson Taylor • Launcher & Back Up PIE: Mr Scott Ritterhouse • Safety Engineer (SE): Ms. Theresa Shaffer • Launcher & Back up SE: Mr Darren Bromwell

  3. Key Milestones: Schedule • Assumption: Launch NET February 2006 • RAFT Kickoff Apr 04 • RAFT USNA SRR Sep 04 • RAFT PDR19 Nov 04 • Launcher CDR Nov 04 • RAFT Phase 0/1 Safety 16 Dec 04 • RAFT CDR Feb 05 • RAFT Phase 2 Safety Feb 05 • RAFT Flight Unit Testing May 05 • RAFT Phase 3 Safety Aug 05 • RAFT Delivery/Install Oct 05 • RAFT Flight (STS-116) 09 Feb 06

  4. So Many CUBEsats 30 to 50 in Construction How to Track them??? AIAA/USUSmall Sat Conference 30% of papers were for PICO, NANO and CUBEsats All smaller than 10 cm

  5. Mission Statement The mission of RAFT is: • To provide the Navy Space Surveillance (NSSS) radar fence with a means to determine the bounds of a constellation of PicoSats otherwise undetectable by the radar fence • To enable NSSS to independently calibrate their transmit and receive beams using signals from RAFT. • This must be accomplished with two PicoSats, one that will actively transmit and receive, and one with a passively augmented radar cross-section. • Additionally, RAFT will provide experimental communications transponders for the Navy Military Affiliate Radio System, the United States Naval Academy’s Yard Patrol crafts, and the Amateur Satellite Service.

  6. NSSS Radar Fence

  7. RAFT1 Mission Architecture

  8. MARScom Mission Architecture

  9. Military Affiliate Radio System • The Mission of the MARS system is to: • Provide auxiliary communications for military, federal and local disaster management officials • Assist in effecting communications under emergency conditions. • Handle morale and quasi-official message and voice communications traffic for members of the Armed Forces and authorized U.S. Government civilian personnel • Provide routine operations in support of MARSGRAMS and … contacts between service personnel and their families back home.

  10. Yard Patrol Craft Application Unique UHF AM Uplink and HF SSB downlink

  11. RAFT1 and MARScom

  12. PassGeometry

  13. Raft1 Block Diagram

  14. MARScom Block Diagram

  15. RAFT Lifetime Estimate 6.5 Months

  16. MARScom Lifetime Estimate 4.9 Months

  17. SSPL4410 LAUNCHER: Operation 1. NEA DEVICE ACTUATES 2. LATCH ROD SLIDES FORWARD 3. DOOR SWINGS OPEN AND LATCHES 4. PICOSATs EJECT 3 4 Door in open, latched, landing position 2 No separation until after both picosats clear launcher NOTE: Top Cover and LatchtrainCover not shown in this view 1

  18. RAFTDeployment Velocity of CM: 1.00 m/s Velocity of RAFT: 0.57 m/s Velocity of MARScom: 1.57 m/s

  19. Air Track Separation Test

  20. IDEAS Model

  21. IDEAS Model

  22. Assembly

  23. Solar Panel Design COTS Silicon Cells on PCB panel Covered with Clear Teflon Coating 1.5 Watt panel Mechanically rugged for rain/hail/birds PCsat Flight Heritage

  24. Top Panel VHF Antenna holes HF whip hole Antenna pockets for other satellite

  25. RAFT1 Internal DiagramTopView

  26. RAFT Internal DiagramCornerDetail

  27. Side Panel

  28. Side Panel Detail Loaded Side .25” thick

  29. Custom Side Panel for Antenna Crank and GSE Connector

  30. SSPL4410 LAUNCHER: Preload and Launch Loads • For SSPL4410 with MEPSI: • PICOSAT mass m = 1.6 kg = 3.5 lbs • Preload > { 24 g x 3.5 lbs = 84 lbs } • F = 125 lb max preload + 24 g x 3.5 lb  210 lbs • 24 g calculated in SVP • For SSPL5510 with RAFT: • PICOSAT mass m = 7 kg = 15.4 lbs • Preload > { 24 g x 15.4 lbs = 370 lbs } • F = 500 lb max preload + 24 g x 15.4 lb  870 lbs credit:

  31. Structure Displacements

  32. Depressurization Rate .040 hole Gives 2:1 margin for depresurization

  33. Battery Box

  34. RAFTAntennaSeparationMechanisms

  35. RAFT Antenna Springs

  36. Long-Wire Antenna

  37. Electrical Systems And Connections Each panel one pigtail All plug into Interface Board on the PSK panel

  38. Interface Board

  39. EPS and Solar Power Budget

  40. Raft1 Block Diagram

  41. Solar Power Budget Conclusion: The PCsat panels per side of the satellite and a 39% eclipse time, an average available bus load of 0.96 watts will be available to the spacecraft.

  42. RAFT1 Required Power Budget Whole Orbit Average 10% Depth of Discharge

  43. MARScom Required Power Budget

  44. Power System

  45. Simplified Power System Charge in Parallel Transmit in Series Duty cycle 4%

  46. Operations Safety Features All Transmitter circuits time-out to OFF

  47. Post Cold Test Battery Condition(No Leakage)

  48. Battery Cold Test Time Line

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