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UASat Progress Review

UASat Progress Review. Tracking, Telemetry and Command (TTC) January 26, 1999 Dana Irvin, Team Leader. Overview. Subsystem Overview Block Diagram Systems Level Requirements Review SEDSat Operational Profile Plans for Spring 99. Subsystem Overview. Amateur Radio Satellite Frequencies

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UASat Progress Review

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  1. UASat Progress Review Tracking, Telemetry and Command (TTC) January 26, 1999 Dana Irvin, Team Leader

  2. Overview • Subsystem Overview • Block Diagram • Systems Level Requirements Review • SEDSat Operational Profile • Plans for Spring 99

  3. Subsystem Overview • Amateur Radio Satellite Frequencies • Data downlink: 2.4 GHz Amateur band • Command uplink: 1.2 GHz Amateur band • Pacsat store-and-forward • Uplink: 2m Amateur Band • Downlink: 70cm Amateur Band

  4. Data Rates and Modulation Schemes • Primary downlink • up to 2Mbps QPSK • Primary uplink • 9600 bps QPSK • Pacsat system • 9600 bps FSK

  5. Downlink RF Power Outputs • Telemetry Downlink: 400mW • Pacsat Downlink: 900mW • Spacecraft Antennas • Uplink Design: Array of 6-1/2 wave monopoles • Downlink Design: Deep parabolic • Pacsat Design: 2m monopole & 70cm turnstile

  6. Block Diagram

  7. Systems Level Requirements Review (SLRR) • Held August 18, 1998 • Major Requirement • Terminal Node Controller (TNC) must be able to downlink a Quadrature Phase Shift Keying (QPSK) modulated signal needed to get all science and telemetry data acquired within 4 orbits to the ground within a standard pass time of 7 minutes ( @ 2Mbps = 105 MB)

  8. SEDSat Operational Profile • Launched Oct-24-1998 05:08:00.525 MST • Groundstation Construction • Groundstation Software • SEDSat Problems • Lessons Learned

  9. Plans for Spring 99 • DILSAT (Day In the Life of the SATellite) • Antennas completely simulated/built • Working Prototype

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