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Overview

The joint TerraSAR-X/TanDEM-X Mission Planning System F. Mrowka, M. P. Geyer, C. Lenzen, A. Spörl, T. Göttfert, E. Maurer, M. Wickler, B. Schättler I GARSS 2011, Vancouver, 29-July-2011. Overview. The TanDEM-X Mission Planning Challenges Two Satellites and Two Missions

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Overview

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  1. The joint TerraSAR-X/TanDEM-X Mission Planning SystemF. Mrowka, M. P. Geyer, C. Lenzen, A. Spörl, T. Göttfert, E. Maurer, M. Wickler, B. SchättlerIGARSS 2011, Vancouver, 29-July-2011

  2. Overview • The TanDEM-X Mission Planning Challenges • Two Satellites and Two Missions • Mutual Illumination Risks • Sync-Warning Handling • From the TerraSAR-X (TSX-1 Satellite only: MPS-tsx) to the TanDEM-X (both satellites/both Missions: MPS-tsm-tdm) Mission Planning System • Before Launch • Commissioning Phase • Operational Phase • Outlook

  3. Challenges: Two Satellites – Two Missions

  4. Challenges: Two Satellites – Two Missions MPS-tsx TSM- R2CC MPS DB Constraint- Check, etc TSM- Order- Ingestion TSX-1 CmdGen Order- Ingestion Order- Ingestion

  5. Challenges: Two Satellites – Two Missions MPS-tsm-tdm TSM- R2CC TSX-1 TSM- Order- Ingestion CmdGen MPS DB Constraint- Check, etc TDX-1 CmdGen

  6. Challenges: Two Satellites – Two Missions

  7. Challenges: Two Satellites – Two Missions MPS-tsm-tdm TSM- R2CC TSX-1 TSM- Order- Ingestion CmdGen MPS DB TDM- Order- Ingestion TDX-1 CmdGen TAP TDM- R2CC

  8. Challenges: Mutual Illumination Risks • Input provided every 12h by the FDS • For nominal TerraSAR-X-Acquisitions: • TSX-1 or TDX-1 is selected at first in respect to the exclusion zones • For nominal TanDEM-X Acquisitions: • Selection of the active Satellite at first in respect to the exclusion zones “TSX may not transmit in asc. orbit” 65° TSX-1 50° exclusion zones (example) TDX-1 30° 0° TDX-1 TSX-1 “TDX may not transmit in desc. orbit”

  9. Challenges: Sync-Warnings – The course timing SW TSX-DT max. 53min TSX SWOC- Result Sync-Warning-Opportunity 1 Sync-Warning-Opportunity 2 SW TDX t

  10. Challenges: Sync-Warnings – The precise timing SW TSM DT TDM DT TSX Disabled Enabled Disabled DataTake- StartTime- Correction Disabled Disabled SW TDM DT TDX t

  11. Challenges: Sync-Warnings - Example

  12. Challenges • Power-Thermal-Model • MPS-tsx: Orbit-Usage-Model for one Orbit only • MPS-tsm-tdm (To fulfill the demanding TanDEM-X needs): • Thermal-Model: more then 30 independent accumulating time-frames for modeling data acquisition and data downlink • Power-Model: elaborated Power-Usage-Model was implemented to predict the on-board battery-charge-level (consumer: Instrument incl. several Warm-Up-Levels, X-Band-Downlink-Transition, etc. and supply: taking into account eclipse times, satellite-attitude. etc.) • Enhanced priority concept implements a flexibility for GlobalDEM-acquisitions • Down-Link-Delay for TDX-1 and Downlink from both satellites to one station contact => MPS-tsm-tdm has the same availability and performance requirements as the MPS-tsx

  13. MPS-tsm-tdm MPS-tsx to MPS-tsm-tdm: Before TDX-1Launch TSM- R2CC MPS-tsx MPS DB Constraint- Check, etc TSM- Order- Ingestion TSX-1 CmdGen Order- Ingestion Order- Ingestion After TDX-1 Launch ? TSM- R2CC TSX-1 TSX-1 CmdGen MPS DB TSM- Order- Ingestion Space-Craft- Simulator TDM- Order- Ingestion TAP TDX-1 CmdGen TDX-1 TDM- R2CC On-ground

  14. MPS-tsx to MPS-tsm-tdm: Commisioning Phase June‘10 July‘10 Aug‘10 Sep‘10 Oct‘10 Nov‘10 Dec‘10 TDX Orbit Drift16.000 km  20 km TDX Orbit Drift16.000 km  20 km 20 km Formation 20 km Formation Close Helix-Formation 300-400 m Launch 21 June EarlyOrbitPhase 6 Months Commissioning Phase First SAR Image 24 June (MET +3.6) Grg SegmentCheckout TDX Monostatic Comm. Phase First DEM 16 July (MET +25) Bi-static Commissioning Phase First bi-static SAR image 8 August (MET +48) First close formation DEM 19 October (MET +124)

  15. MPS-tsx to MPS-tsm-tdm: Commissioning Phase Mono-Static-Commissioning-Phase • MPS-tsx: • Minor modification to identify TanDEM-X acquisition requests • Ground-Segment ready to support two mission planning systems • Routing of nominal TerraSAR-X Orders to MPS-tsx and specifically ordered ones for TDX-1 to MPS-tsm-tdm • TSX-1 part of TanDEM-X orders need to be ordered as System-Orders via MPS-tsx • MPS-tsm-tdm: • TSX-1 commands verified on space-craft-simulator (occasionally)

  16. MPS-tsx to MPS-tsm-tdm: Commisioning Phase June‘10 July‘10 Aug‘10 Sep‘10 Oct‘10 Nov‘10 Dec‘10 TDX Orbit Drift16.000 km  20 km 20 km Formation Close Helix-Formation 300-400 m Launch 21 June EarlyOrbitPhase 6 Months Commissioning Phase First SAR Image 24 June (MET +3.6) Grg SegmentCheckout TDX Monostatic Comm. Phase First DEM 16 July (MET +25) Bi-static Commissioning Phase First bi-static SAR image 8 August (MET +48) First close formation DEM 19 October (MET +124)

  17. MPS-tsx to MPS-tsm-tdm: Commissioning Phase Close-Formation without full-operational MPS-tsm-tdm not possible: • Sync-Warnings • Exclusion-Zones Operationalisation of MPS-tsm-tdm: • Switch of MPS-tsx • Routing of all TerraSAR-X orders to MPS-tsm-tdm • TSX-1 commands out of MPS-tsm-tdm sent to the TSX-1 satellite

  18. MPS-tsm-tdm: Operationalization / Close Formation Change Cycle 6 Cycle 7 Cycle 8 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 W W W W W W W W W Forma-tion change TSX ASM Test MPS-tsm-tdm Operation-alisation NSG Bi- CP Inuvik TSXX DAS TSXX DAS TSXX DAS First timelines with updated Ground Segment TSM Release on 2 Satellites FFR Sync Warn, ISL Statisitical DTs Kiruna TSX Excl. ZoneTest Statistical DTs TSX: extend. timeline TDX: operational DTs First bi-static image 05.10.2010 04.10.2010 07.10.2010 18.10.2010 26.09.2010 29.10.2010

  19. MPS-tsm-tdm: Bistatic Commisioning Phase June‘10 July‘10 Aug‘10 Sep‘10 Oct‘10 Nov‘10 Dec‘10 TDX Orbit Drift16.000 km  20 km 20 km Formation Close Helix-Formation 300-400 m Launch 21 June EarlyOrbitPhase 6 Months Commissioning Phase First SAR Image 24 June (MET +3.6) Grg SegmentCheckout TDX Monostatic Comm. Phase First DEM 16 July (MET +25) Bi-static Commissioning Phase First bi-static SAR image 8 August (MET +48) First close formation DEM 19 October (MET +124)

  20. MPS-tsm-tdm: Full automatic operations • Since 2010-12-14 MPS-tsm-tdm is running full-automatic and is showing • Same or better performance and • A similar reliability as MPS-tsx! • Some Numbers

  21. MPS-tsm-tdm: Operations • A 24h snap-shot of a command timeline. In this time frame were commanded: • 52 replays (27 TSX-1 and 25 TDX-1) in 33 different downlink contacts to 8 different ground stations • 98 acquisitions (47 on TSX-1 and 51 on TDX-1) comprising 26 TanDEM-X pairs • 31 Sync-Warnings

  22. TanDEM-X Ground Station Network Kiruna Inuvik DLR Neustrelitz for TerraSAR-X Chetumal O‘Higgins

  23. MPS-tsm-tdm: Operations

  24. Outlook • Currently fixed Planning- and Command-Generationnominal time between last order reception and first possible downlink between 6 and 18 hours (except special short notice planning 1h)) event driven planning (just with order reception) and command generation, if confirmed uplink is demanded • Specific for optical sensors • Cloud-Forecast-Handling • Support of constellations • Generic Mission-Planning-System

  25. Outlook • Future Missions • FireBIRD (2013) • IR-Sensor • Two Satellites in Constellation • EnMAP (2015) • Hyper-Spectral-Imager • New Feature: Cloud-Handling • TerraSAR-X 2 (2015) • Probably with TSX-1 and TDX-1 in Constellation • Event-Driven-Planning – Short-Notice-Command-Generation • TanDEM-L (net 2019) • On-Board-Planning?

  26. Mt. St. Helens, USA2010-08-13T01:54:09

  27. Power Modeling I Lost Values (unused energy) Upper Limit (battery capacity) Fill Level(state of charge) Lower Bound Conflict on fill level Battery discharging Battery full Solar panels charging the battery Energy conflict Energy consumption greater than supply Solar panels charging the battery

  28. Power Modeling II Charge level without warm-up Charge level Charge level with warm-up Consumption profile Warm-up of RS1 instrument

  29. SSMM-Modelling TDX-1 memory TSX-1 memory Datatake 1 Datatake 2 Datatake 3 Datatake 4 Datatake 5 Datatake 6 DL1 TSX-1 DL1 TSX-2 DL1 TDX-1 DL1 TDX-2 DL1 TSX-3 DL1 TDX-1 DL1 TDX-3 DL1 TSX-4 DL1 TDX-4 DL1 TDX-2 DL1 TDX-3 DL1 TSX-5 DL1 TDX-5 DL1 TSX-6 DL1 TDX-6 DL1 TDX-4 DL1 TDX-5 DL1 TDX-6 Groundstation GS Groundstation

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