1. 1 Low Cost Multimission Telecommand and Telemetry Natal Ground Station (TT&C) by Jean Paul DUBUT (INPE/CRN) 1 st COROT Workshop – Natal – RN – Brazil

2. 2 INPE Ground Station Segment 1 st COROT Workshop

3. 3 TT&C Natal Ground Station Concept Microsatellite © CNES / illustration David Ducros Minisatellite © CNES / illustration 1 st COROT Workshop Multimission TT&C - EQUARS - COROT - PROTEUS -SCD´s - CBERS

4. 4 TT&C General Information Manufacturer: ELTA Low cost: US$ 1,200,000.00 Site installation:  INPE/CRN  Natal, RN, Brazil Covering area: northeast and Equatorial Atlantic Geographic coordinates  Latitude: 05º 50’ 10,06” S  Longitude: 35º 12’ 27,34” W  Altitude: 56,25 m 1 st COROT Workshop

5. 5 TT&C Implementation Schedule Start: June 2004; Kick-off meeting: July 2004; CDR: end of November 2004; Factory acceptance tests: June 2005; On site installation and acceptance tests: October 2005; Operation and maintenance training: October 2005. 1 st COROT Workshop

6. 6 TT&C Technical Specifications S-Band: - TC from 2025 to 2120 MHz - TM from 2200 to 2300 MHz EIRP > 50 dBW in whole bandwidth G/T > 10 dBK in whole bandwidth TM Flux : > -155 dBW/m 2 (25Kbits/s) > -140 dBW/m2 (750Kbits/s) Techno losses < 2 dB Acquisition threshold : Eb/N0 > 6 dB Tracking threshold : Eb/N0 > 5.5 dB 1 st COROT Workshop

7. 7 TT&C Technical Specifications Telecommand data rate : Up to 20 kbit/s Protocol: CCSDS Telemetry data rate : between 25 kbit/s and 1 Mbit/s Protocol: CCSDS Ranging rate: better than 1Hz  0,1ms relative to UTC Time code format: IRIG-B Communication interface: LAN (TCP/IP/Ethernet) Antenna diameter: 3 meters Antenna pointing resolution: better than  0.2º MTBF:  1000 hours 1 st COROT Workshop

8. 8 TT&C Automatic and Remote Functions Time Remote Operation Automatic Operation Pass Planning File Sent by CCC Pass Preparation Pass - 5min Pass Management Reading of TM in real time by CCC Pass Closure Reading of TM after pass by CCC Next Pass Preparation 1 st COROT Workshop

9. 9 Ground Segment Interfaces 1 st COROT Workshop

10. 10 Level 3 : Complete Station with S band interface and antenna TT&C Modular Conception Level 2: Kit with 70 Mhz interface to be connected to external antenna Level 1 : Test tool For Integration activity 1 st COROT Workshop

11. 11 TT&C Easy Maintenance Concept MODULAR CONCEPTION FOR EASY MAINTENANCE SET OF SPARES FOR HIGH AVAILABILITY RATE SET OF PREVENTIVE MAINTENANCE PROCEDURES SET OF CORRECTIVE MAINTENANCE PROCEDURES 1 st COROT Workshop

12. 12 TT&C Building Bays Radome Building interface Building Antenna Station fully compatible with any external wheather conditions (wind, snow, rain, temperature, humidity) 1 st COROT Workshop

13. 13 Photos about Station 1 st COROT Workshop

14. 14 TT&C Architecture 1 st COROT Workshop

15. 15 Sweeping and Doppler Compensation Time Frequency S Band +/- 60 kHz Pure Carrier Sweeping Acquisition Process Generated Frequency Time Received Frequency Doppler Compensation for Constant Received Frequency 1 st COROT Workshop

16. 16 Distance System Measurement Telemetry with frame header Delay 1 Telecommand with Synchro message Delay 3 Delay 2 1  s Datation Distance = f ( delay1, delay2, delay 3 ) 1 st COROT Workshop

17. 17 TT&C Autonomous Orbit Determination Telemetry Received Frequency Time Orbital parameters = f ( Frequency Profile ) 1 st COROT Workshop

18. 18 TT&C Software Auto-tracking Orbital parameters From Previous Pass Received Power within Main Antenna Lobe Time Accurate Synchronisation on the Orbit Tracking with Orbital Parameters Antenna Pointed to Waiting Direction 1 st COROT Workshop

19. 19 Main Highlights SIGNIFICANT HERITAGE & QUALIFICATION EASY MAINTENANCE MODULAR CONCEPTION For MULTIMISSION OPERATION AUTOMATIC & REMOTE FUNCTIONS HIGH PERFORMANCE for MULTI- MISION ON-GOING IMPROVEMENTS COMPATIBLE WITH ANY WEATHER CONDITIONS 1 st COROT Workshop

20. 20 1 st COROT Workshop Link and Contacts www.crn2.inpe.br Phone: ++ 55 84 231 4733 Fax: ++ 55 84 231 4941