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Communications Conceptual Design Review

Communications Conceptual Design Review. Karim Barakat. Presentation Outline. Derived Requirements Subsystem Overview Antenna Selection LP-1 Resting Geometry Coverage Tx Data Rate Requirement Link Budget Dielectric Loss of Regolith Schedule. Derived Requirements. Subsystem Overview.

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Communications Conceptual Design Review

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  1. Communications Conceptual Design Review Karim Barakat

  2. Presentation Outline • Derived Requirements • Subsystem Overview • Antenna Selection • LP-1 Resting Geometry • Coverage • Tx Data Rate Requirement • Link Budget • Dielectric Loss of Regolith • Schedule Karim Barakat

  3. Derived Requirements Karim Barakat

  4. Subsystem Overview C&DH Raw Telemetry Data: 228 Mbits Structures Withstand 15,000 g loads Transmitter Tx Antenna Medium OKINA [Relay Satellite] Encoder/Decoder Receiver Rx Antenna Power Peak ~ 5W [TBC] Thermal Control -20°C – 50°C Karim Barakat

  5. Antenna Selection OKINA Uses Karim Barakat

  6. LP-1 Resting Geometry Best Case Scenario Likely Scenario Worst Case Scenario Ref: Communication System and Operation for Lunar Probes Under Lunar Surface Karim Barakat

  7. Coverage Karim Barakat

  8. Tx Data Rate Requirement Karim Barakat

  9. Link Budget Medium Communications Subsystem OKINA [Relay Satellite] Equivalent Isotropic Radiated Power [EIRP] = Tx power – Tx feeder loss +Tx Antenna Gain Link Margin = EIRP – RF loss in Propagation – Rx RF Performance Karim Barakat

  10. Dielectric Loss of Regolith • - Above 1 MHz independent of frequency and temperature • - The loss tangent is strongly dependent on the density of the content of (TiO2 +FeO). • Average density of the regolith from the antenna to the surface is estimated to be 1.6 - 1.85 g/cm3 ~0.8 dB Orbit altitude: 240 km elevation angle = 45 deg. rest-attitude of probe = 60 deg. Ref: Communication System and Operation for Lunar Probes Under Lunar Surface Karim Barakat

  11. Schedule Karim Barakat

  12. Questions?

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