26 GHz FREQUENCY BAND  IN THE ESTRACK DEEP SPACE NETWORK R. Abello, P. Besso OPS-GS
ESA upcoming missions  K 15 Mbps X 4kbps X 5/24 1.5 L2 2020 FIRI K 40-50 Mbps X 4kbps X 4/24 1.5 L2 2015 WFI K or Ka To 1 ...
NASA/JPL upcoming missions 2013
Study Objectives <ul><li>Define K-Band mission requirements and to establish preliminary system specifications </li></ul><...
Frequency bands <ul><li>Ka-Band downlink 31.8 -32.3 GHz to be used for Deep Space Missions </li></ul><ul><li>K-Band downli...
Communication requirements analysis <ul><li>Need for 35m antennas </li></ul><ul><li>Need for cryo-LNAs </li></ul><ul><li>C...
K-Band Sky Noise 1/3
K-Band Sky Noise 2/3
K-Band Sky Noise 3/3
K-Band Sky attenuation 1/2
<ul><li>Impact of atmospheric attenuation on the  link budget </li></ul><ul><li>Important criterion for site selection of ...
DSA1 Block Diagram
DSA1 antenna 1/8
Basic Philosophy Present DSA1 design including K-band upgrade University of Pavia   Antenna Optics, Dichroics & Feeds DSA1...
DSA1 antenna 3/8 <ul><li>Frequency: 25.5 – 27 GHz </li></ul><ul><li>Polarisation:  Dual Circular </li></ul><ul><li>Trackin...
DSA1 antenna 4/8
DSA1 antenna 5/8
DSA1 antenna 6/8
DSA1 antenna 7/8
DSA1 antenna 8/8
<ul><li>Size of the M4 dichroic to be manufactured is big (3.2m x 1.75m) </li></ul><ul><li>Sag of the dichroic mirror due ...
DSA2 Block Diagram
Basic Philosophy Present DSA2 design including KaTX-band upgrade <ul><li>Maximum reuse concept: </li></ul><ul><ul><li>Dual...
DSA2 antenna 2/8
DSA2 antenna 3/8
DSA2 antenna 4/8
DSA2 antenna 5/8
DSA2 antenna 6/8
DSA2 antenna 7/8
DSA2 antenna 8/8
<ul><li>Size of the M6 dichroic does not introduce any sagging on the surface </li></ul><ul><li>Limited down-time of the a...
K-Band LNAs Noise figure requirement  requires cryo-LNAs using state-of-the art HEMT (InP devices) which are not commercia...
R. Abello presentation
Next steps <ul><li>Refinement of the analysis of the atmospheric propagation  </li></ul><ul><li>Development of the X/K-Ban...
What are the other Agencies doing? <ul><li>26 GHz band is the baseline for NASA Moon missions together with S-Band up- and...
 
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OPS Forum Ka-band architecture Part1 05.10.2007

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The possibility of using K- and Ka-band frequencies (26 & 32 GHz) in the ESTRACK deep-space stations brings substantial change in the architecture of future operational ground segments. This forum will present planned changes in the deep-space antennas as well as the co-existence of X, K and Ka components in an upgraded architecture (Part I).

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OPS Forum Ka-band architecture Part1 05.10.2007

  1. 1. 26 GHz FREQUENCY BAND IN THE ESTRACK DEEP SPACE NETWORK R. Abello, P. Besso OPS-GS
  2. 2. ESA upcoming missions K 15 Mbps X 4kbps X 5/24 1.5 L2 2020 FIRI K 40-50 Mbps X 4kbps X 4/24 1.5 L2 2015 WFI K or Ka To 1 Mbps X 75 kbps X 9/24 270 Helio Eccentric 2015 SoIO X X 400 Mars 2013 EXOMARS K 28 kbps X 7 kbps X 2 kbps 9/48 or 2.3/48 55 Helio at 1AU 2015 LISA K To 1 Mbps X 10 kbps X 4 kbps 12/24 1.5 L2 2012 DARWIN Downlink Downlink Uplink Communications Max Ground Contact hrs Max Range (1E6 km) Orbit Launch date Name
  3. 3. NASA/JPL upcoming missions 2013
  4. 4. Study Objectives <ul><li>Define K-Band mission requirements and to establish preliminary system specifications </li></ul><ul><li>To develop a set of sub-system specifications based on the system specifications </li></ul><ul><li>To investigate each major sub-system </li></ul><ul><li>To investigate the optical/BWG solutions for each Deep Space Antenna (DSA1 and DSA2) </li></ul><ul><li>To establish the feasibility of the introduction of K-Band reception into each of the DSA antennas </li></ul>
  5. 5. Frequency bands <ul><li>Ka-Band downlink 31.8 -32.3 GHz to be used for Deep Space Missions </li></ul><ul><li>K-Band downlink 25.5 – 27.0 GHz to be used for Moon, Lagrangian and Near Earth Missions (including Earth Observation Missions) </li></ul>
  6. 6. Communication requirements analysis <ul><li>Need for 35m antennas </li></ul><ul><li>Need for cryo-LNAs </li></ul><ul><li>CD = 0.25 average clear weather </li></ul>
  7. 7. K-Band Sky Noise 1/3
  8. 8. K-Band Sky Noise 2/3
  9. 9. K-Band Sky Noise 3/3
  10. 10. K-Band Sky attenuation 1/2
  11. 11. <ul><li>Impact of atmospheric attenuation on the link budget </li></ul><ul><li>Important criterion for site selection of DSA3 in case 26 GHz is required </li></ul>K-Band Sky attenuation 2/2
  12. 12. DSA1 Block Diagram
  13. 13. DSA1 antenna 1/8
  14. 14. Basic Philosophy Present DSA1 design including K-band upgrade University of Pavia Antenna Optics, Dichroics & Feeds DSA1 Case – Darmstadt, Germany – 06/02/2007 DSA1 antenna 2/8 <ul><li>Maximum reuse concept: </li></ul><ul><ul><li>Dual reflector </li></ul></ul><ul><ul><li>Lower BWG </li></ul></ul><ul><li>Modifications limited to: </li></ul><ul><ul><li>M4 </li></ul></ul><ul><ul><li>New M4b </li></ul></ul><ul><ul><li>New feed in the upper BWG </li></ul></ul>
  15. 15. DSA1 antenna 3/8 <ul><li>Frequency: 25.5 – 27 GHz </li></ul><ul><li>Polarisation: Dual Circular </li></ul><ul><li>Tracking: K-Band </li></ul>
  16. 16. DSA1 antenna 4/8
  17. 17. DSA1 antenna 5/8
  18. 18. DSA1 antenna 6/8
  19. 19. DSA1 antenna 7/8
  20. 20. DSA1 antenna 8/8
  21. 21. <ul><li>Size of the M4 dichroic to be manufactured is big (3.2m x 1.75m) </li></ul><ul><li>Sag of the dichroic mirror due to gravity </li></ul><ul><li>Big down-time of the antenna in case the upgrade is required </li></ul><ul><li>Poor G/T compared to the DSA2 upgrade </li></ul><ul><li>DSA1 is the only Deep Space Antenna operating in S-Band. NASA/JPL Moon mission model considers the use of S- and K-Band simultaneosly. </li></ul>Conclusions DSA1 upgrade
  22. 22. DSA2 Block Diagram
  23. 23. Basic Philosophy Present DSA2 design including KaTX-band upgrade <ul><li>Maximum reuse concept: </li></ul><ul><ul><li>Dual reflector </li></ul></ul><ul><ul><li>Upper BWG </li></ul></ul><ul><ul><li>M5 </li></ul></ul><ul><ul><li>Feeds (if applicable) </li></ul></ul><ul><li>Modifications limited to: </li></ul><ul><ul><li>M6, M7, M8 </li></ul></ul><ul><ul><li>Feeds </li></ul></ul>University of Pavia Antenna Optics, Dichroics & Feeds DSA2 Case – Darmstadt, Germany – 06/02/2007 DSA2 antenna 1/8
  24. 24. DSA2 antenna 2/8
  25. 25. DSA2 antenna 3/8
  26. 26. DSA2 antenna 4/8
  27. 27. DSA2 antenna 5/8
  28. 28. DSA2 antenna 6/8
  29. 29. DSA2 antenna 7/8
  30. 30. DSA2 antenna 8/8
  31. 31. <ul><li>Size of the M6 dichroic does not introduce any sagging on the surface </li></ul><ul><li>Limited down-time of the antenna in case the upgrade is required </li></ul><ul><li>Good G/T in K-Band compared to the DSA1 upgrade </li></ul><ul><li>Mechanical and thermal feasibility of the dual frequency X/K-Band feed to be assessed. Performance in X-Band to be improved in order not to degrade the X-Band G/T wrt the existing design </li></ul>Conclusions DSA2 upgrade
  32. 32. K-Band LNAs Noise figure requirement requires cryo-LNAs using state-of-the art HEMT (InP devices) which are not commercially available. A number of institutions are willing to develop HEMT amplifiers for this application. However, the main source of concern is how to obtain InP devices.
  33. 33. R. Abello presentation
  34. 34. Next steps <ul><li>Refinement of the analysis of the atmospheric propagation </li></ul><ul><li>Development of the X/K-Band feed </li></ul><ul><li>Development of cryo-LNAs covering the 26 GHz band </li></ul><ul><li>Undertake breadboard level development of high speed front-end DSP boards based on FPGA technology </li></ul><ul><li>Investigate technologies and design architectures in order to minimise group delay and amplitude distortion over very wide bandwidths </li></ul>
  35. 35. What are the other Agencies doing? <ul><li>26 GHz band is the baseline for NASA Moon missions together with S-Band up- and downlink (future 21.55-22.55 GHz uplink). </li></ul><ul><li>26 GHz is the primary downlink of the James-Webb telescope </li></ul><ul><li>NASA/JPL are currently upgrading their 34 m BWG antennas to 26 GHz downlink (2008 – 2010) </li></ul>

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