Top Banner
27. Sept. 2013, IAC- 13,B4,3,11,x17101 Andreas HORNIG, [email protected] 1 Andreas HORNIG [email protected] Institute of Space Systems (IRS), University of Stuttgart Timm Eversmeyer [email protected] Ulrich Beyermann [email protected] Beijing, 27.09.2013 IAC-13,B4,3,11,x17101
16
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript

2. Content of Presentation Small Satellite Situation Other Tracking & Communication Networks Proposed Solution Tracking by Pseudoranging DGSN Architecture DGSN Ground Station DGSN Infrastructure Direct ApplicationsPerspectives & Conclusions 27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 3. Small Satellite SituationFinancial and planning challenges Orbit Piggy-back launch Uncertainty in provided orbit Infrastructure few ground stations Exisiting stations sometimes too good for small satellites Minimum access time to satellite Frequency allocation Ham-radio operators 27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] as mandatory secondary payload onboard VERDE sat (IRS, Uni Stuttgart)3 4. Other Tracking & Communication Networks Tracking Services NORAD by US and RC Air Force DORIS by CNES Communication Services Deep Space Network ESTRACK Communication Infrastructure Mission specific GENSO27. Sept. 2013, IAC-13,B4,3,11,x17101Regular updates of public two-line element set data-base Regular updates of public two-line element set data-bases Own ground stations or collaborative and time shared stationsAndreas HORNIG, [email protected] 5. Proposed Solutiona) Time synchronization of GS with global GNSS time sourced) Global Data-Dump communication methodb) Correlation of beacon signal with reception time at GS. Using correlated data for tracking.c) Targeting of satellite on tracked orbit using corrected orbit elements27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 6. Tracking by Pseudoranging Solving Apollonius Problem by Apollonius of Perga (262 BC 190 BC)27. Sept. 2013, IAC-13,B4,3,11,x17101reverse GPS One beacon signal transmission Reception at 4 (or more) ground stations Correlation of the beacon signal event with reception time at each ground stationAndreas HORNIG, [email protected] 7. Tracking by Pseudoranging Simulation Modes 0. combinatorical 1. overdetermined27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 8. Tracking by PseudorangingPointing accuracy over ground stations10000000 1000000Simulation Modes 0. combinatorical 1. overdeterminedAccuracy of positioning depends on Number of ground stations Relative position of ground stations to satellitepositioning dR [m]100000200 km orbit10000810 km orbit 1000 100 10 1Accuracy 2m (200 km orbit, 100 x 100 km GS array) 27. Sept. 2013, IAC-13,B4,3,11,x1710189101112131415ground stations [-] 810km-mod0810km-mod1Andreas HORNIG, [email protected] 9. DGSN Architecture DGSN Users serve as listening nodes Users can be everyone, not only ham-operators Less complex More active users Real citizen science and outreach 27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 10. DGSN Ground Station16.0GS Density Global coverage of satellite in 600 km orbit 2.4 GHz @ 2 kbit/[email protected]/s [email protected]/s8.0system margin [dB]Regulations Amateur radio frequencies Reception only! (phase 1)[email protected]/s2.4GHz@1kbit/s 4.01.2GHz@1kbit/s 0.4GHz@1kbit/s 2.4GHz@2kbit/s0.0020406027. Sept. 2013, IAC-13,B4,3,11,x171011.2GHz@2kbit/s 0.4GHz@2kbit/s-4.0365 stations worldwide80 = -8.0 4 2elevation angle []Andreas HORNIG, [email protected] 11. DGSN Ground Station Hardware Small devices Attachable to personal computers Modularity for extensions Open-source27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 12. DGSN Infrastructure Constellation Citizen science project since 2010 Distributed computing (BOINC) Solving numerical aerospace problems Virtual super-computer via the InternetAdding ground station devices Global sensor grid Reliable and safe system Sensor AND processing capabilitiesUsers ConstellationCountriesTeraFlops78481083.957(aerospaceresearch.net/constellation) 27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 13. Direct Applications Ground Fox hunt Air Quadrocopter, ADS-B High altitude Weather Balloons DLR/ESA REXUS/BEXUS (Team Frede) Space Small satellites (FlyingLaptop, IRS) Cubesats (ArduSat)ESRANGE, Sweden 27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 14. Perspectives & Conclusions Target Group nano and small satellites by universities satellite constellations and swarms (QB50 & GENSO) re-entry vessels (MIRKA 2) high altitude experiments (REXUS/BEXUS) balloons (weather ballons, BEXUS) planes and drones (ADS-B, Stuttgarter Adler) sensoring platformOpen Access Open for everyone Open tracking data-base Optional open payload data Faster, cost efficient provision of data to small projects Open source(thunder-, flash-,nuclear detonation detection) GNSS quality measuring (WAAS, EGNOS) Safety of life (avalanche)27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] ways to extend the concept beyond satellites! 14 15. Last SlideThank you for your attention! Questions? Join the Distributed Ground Station Network! www.aerospaceresearch.net/dgsn This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License. 27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected] 16. APPENDIX Clustering: results and method27. Sept. 2013, IAC-13,B4,3,11,x17101Andreas HORNIG, [email protected]