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CINEMA Communications & Ground Systems Manfred Bester

CINEMA Communications & Ground Systems Manfred Bester. Agenda. Agenda Concept of Operations S-Band Communications Ground Systems Flight Software Future Work. Concept of Operations. Concept of Operations Mission Orbit Spin Stabilized Spacecraft

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CINEMA Communications & Ground Systems Manfred Bester

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  1. CINEMA Communications & Ground Systems Manfred Bester

  2. Agenda • Agenda • Concept of Operations • S-Band Communications • Ground Systems • Flight Software • Future Work

  3. Concept of Operations • Concept of Operations • Mission Orbit • Spin Stabilized Spacecraft • Baseline Orbit 650 km Circular at 72° Inclination • Pass Coverage • Typically 4 Passes/day with 30 min Access Time • Tracking via TLEs Downloaded from USSTRATCOM • Data Recovery • Store-and-forward Scheme, Downlink at 1 Mbps • Recoverable Science Data Volume 760 Mbits/day • Ground Segment • MOC and Ground Station Located at UCB/SSL • Look into Using Heritage Control System (ITOS)

  4. CINEMA Ground Track

  5. Communications Concept CINEMA BGS 3m Eng TLM/CMD 2400-2450 MHz BGS 11m Science TLM 2200-2300 MHz MOC at UCB/SSL

  6. S-Band Communications • S-Band Communications • Telecom Trades • Transceivers • Flight Antennas • Flight Software • Ground Software • Ground Stations • BGS 11m • BGS 3m • Link Budgets • STDN and WiFi Links • Spectrum Licensing

  7. S-Band Link Budgets • Link Budgets for STDN and WiFi TLM Links

  8. STDN S-Band Link • STDN S-Band Link • Transceiver Options: SpaceQuest, Emhiser • Heritage: CHIPSAT, Various Others • Spectrum Licensing: Need NTIA License • Trades • Advantages: Can Use BGS “As Is” • High Link Margin • Low Risk • Disadvantages: Onboard Software Changes • Ground Software Changes SpaceQuest TX-2400 Transmitter

  9. WiFi S-Band Link • WiFi S-Band Link • Transceiver Options: MicroHard • Heritage: GENESAT • Spectrum Licensing: Need Amateur Radio License • Trades • Advantages: Reuse Existing Flight Hardware • and Software • Disadvantages: Need Additional Ground Station • Unknown Impact of Local WiFi • Interference MicroHard MHX-2440 Transceiver

  10. S-Band Prototype Antennas • First Prototype Model • Linear Polarized Patch Antenna • Overall Dimensions 70.2 x 70.2 mm2 • RT/Duroid 6002 Material Ordered • Thickness 3.048 mm, Copper Cladding 0.035 mm, εr = 2.94 • Fabricate Antenna at SSL • Test with BGS 11-m Antenna in Far Field

  11. S-Band Flight Antennas • Flight Models • Circular Polarized Patches: • Need 4 • Typical Gain Pattern: • Hemispherical with Taper • Performance Goals • See Table Below

  12. Ground Systems • Ground Systems • Mission Operations • Command and Control System • Mission Planning Products • Ground Station • Science Data Processing

  13. Flight Software Functions

  14. Future Work • Future Work • Communications Design • Trades for Selection of Radios Ongoing • S-Band Antenna Prototyping Ongoing • Ground Systems • Ground Station Options Tied to Selection of Radios • Command & Control Systems • Flight Software • Received PharmaSat Code from ARC • Need to Look into Modifying Code • Develop Code to Interface to High-rate Transmitter • Consider Other Options • Look into CCSDS Compatibility

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