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Analysis Update Manfred Bester

Analysis Update Manfred Bester. Analysis Update. Overview Attitude Analysis – Covered in RFA Response Link Analysis Telemetry Recovery Pass Scheduling Power Analysis – Covered in RFA Response. Ground Network Link Analysis. Space Network Link Analysis.

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Analysis Update Manfred Bester

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  1. Analysis Update • Manfred Bester

  2. Analysis Update • Overview • Attitude Analysis – Covered in RFA Response • Link Analysis • Telemetry Recovery • Pass Scheduling • Power Analysis – Covered in RFA Response

  3. Ground Network Link Analysis

  4. Space Network Link Analysis • Detailed Link Analyses Performed by GSFC Code 451 • Ground Network and Space Network Support • Link Margin as Function of Range and Data Rate

  5. BGS RF Spectrum Survey • Performed RF Survey at THEMIS Telemetry Frequency • Scanned Azimuth and Elevation in Several Sectors Using Automated Procedure for Interference Detection • Sector Scan: Azimuth 0° - 180°, Elevation 0° - 12° Azimuth 180° - 360°, Elevation 0° - 2° • Frequency: 2282.5 ± 10 MHz • Polarization: RHCP and LHCP • Results • Found Only One Signal with Power > 10 dB at 2285.9 MHz • Narrow-band Signal, Unstable in Frequency • Antenna Pointed at Azimuth 228.3° and Elevation -1.5° • Peak Power 20 dB with RHCP and 22 dB with LHCP Feed • Signal Drops to 6 dB at 1.5° Elevation • Noise Floor at -93 dBm in 100 kHz RBW and 30 kHz VBW • Signal Will Not Cause Interference with THEMIS

  6. Science Data Acquisition • Various Science Modes • Slow Survey (SS) • Fast Survey (FS) • Particle Burst (PB) • Wave Burst (WB) • Mode Control Via ATS and/or On-board Triggers • On-board Data Compression • Selectively Enabled / Disabled • Applied Prior to Downlink • Segmentation into 64 Byte Input Blocks • Output Blocks Are Variable in Length • Relatively Short Block Size Minimizes Impact from Bit Errors • Compression Factor of 1.5-2.0 Achievable • Efficiency Depends on Instrument Data Type • Solid-state Recorder Sized at 256 MBytes • 100 MBytes Available for Storage of Science Data

  7. Telemetry Data Rates Note: For any given pass, one telemetry rate will be selected based on predicted link margin.

  8. Telemetry Data Delivery • Delivery of Stored Telemetry Data • Post-pass File Transfer • Initiated by Ground Station or MOC

  9. Telemetry File Naming • Telemetry File Naming Conventions • Format: • FACILITY.PROBE_BUS_NAME.TLM_VCN.YYYY_DDD_HHMMSS.dat • Examples: • BGS.THEMIS_A.TLM_VC0.2007_028_060312.dat • WGS.THEMIS_B.TLM_VC1.2007_029_012031.dat • MIL.THEMIS_C.TLM_VC2.2007_038_102319.dat • AGO.THEMIS_D.TLM_VC3.2007_032_151745.dat • HBK.THEMIS_E.TLM_VC6.2007_034_234512.dat • WSC.THEMIS_A.TLM_VC0.2006_301_001834.dat

  10. Pass Support Plan Blue:Required Passes for Recovery of All Telemetry Data at a Rate of 524.288 kbps. Red: Additional Passes Available for Tracking and Probe Monitoring at Lower Data Rates.

  11. Mission Contact Schedule Available Near-perigee Contacts at Nominal High Data Rata of 524.288 kbps

  12. Prioritized Contact Schedule Prioritized Near-perigee Contacts at Nominal High Data Rata of 524.288 kbps

  13. Contact Schedule Detail Sample of Available Daily Contacts at Nominal High Data Rata of 524.288 kbps

  14. Low Rate Contact Schedule Available Contacts at Nominal Low Data Rata of 4.096 kbps

  15. Ground Station Contacts • Ground Station Contact Summary • Number of Passes Based on Detailed 2-Year Mission Design • BGS 11-m (Primary) • WGS 11-m, MILA 9-m, AGO 9-m and HBK 10-m (Secondary) • Passes Included to Support Routine and Special Operations • Daily BGS Contacts with All Probes for State-of-health Monitoring • Maneuver Support, Instrument Commissioning, Doppler Tracking • L&EO Activities Cover 90 Days, Beginning on 21-Oct-2006

  16. TDRSS Contacts • TDRSS Contact Summary • Launch Support • Probe A Transmits During Probe Release • Maneuver Support Near Perigee • Apogee Raise Maneuvers for All Probes • Contingency Support • Not Very Critical Because of Long Ground Station View Periods

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