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Dipl.-Ing. (FH) Andreas HORNIG, Student at University of Stuttgart, BW, Germany

andreas.hornig@aerospaceresearch.netTwitter: @andreashornig

SGAC and OHB SGC Scholarship Opportunity:Describe an innovative mission to the moon;

"innovative" may describe a technical aspect of the mission (such as the propulsion system or scientific purpose) or a non-technical aspect (such as multi-lateral, international partnerships

or funding methods)

TYCHO-L4/L5:

Technical Demonstrator Mission to

Lunar Libration Point L4/L5

and Communication Relay Provision

as a Service

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Current wake of planned moon missions (selection):

Agencies and AdministrationsChina Chang'e 3 2013USA LADEE 2013/01/15India Chandrayaan-2 2014Russia Luna-Glob 2 / Luna-Resurs 2014

Russia Luna-Glob 1 2015USA ILN Node 1 2018[4]

CooperationsESA European Lunar Lander  

(OHB, Astrium)[3]

Space-X Astrobotic Moon Mission „soon as December 2013“[1]

UniversitiesUni Stuttgart BW-1 Kleinsatellit

PrivateGoogle Lunar X-Prize 26 Teams 2012 - 2015[2]

Current Situation

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TYCHO L4/L5 as a Relay:

To provide communication for always out-of-sight locations toaccompanied missions as a bookable and rentable service is the missiongoal of TYCHO-L4/L5.

Communication as Common Mission Point:

Communication for telecommand and telecommunicationDirect communication to earth to own or shared reception points (DSN)

Communication

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Position 1for lander missions and

rovers at the far side, or indeep craters and coldtraps. (OHB EuropeanLander Mission).

Position 2are orbits at short phases,

were the direct line of sight to earth is blocked bymoon.

Position 3is at low halo orbits, wherefuture astronomical

satellites will be placedthat needs a blockage toreduce earth basedelectro-magnetic pollutionor even space-stations.

TYCHO-L4/L5 Mission

Signal Coverage ~48%

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Position 1for lander missions and

rovers at the far side, or indeep craters and coldtraps. (OHB EuropeanLander Mission).

Position 2are orbits at short phases,

were the direct line of sight to earth is blocked bymoon.

Position 3is at low halo orbits, wherefuture astronomical

satellites will be placedthat needs a blockage toreduce earth basedelectro-magnetic pollutionor even space-stations.

TYCHO-L4/L5 Mission

Signal Coverage ~73%

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Position 1

Position 2

 

Position 3

TYCHO-L4/L5 Mission

Signal Coverage ~96%

[l1]

[l2]

[l3]

[l4][l5]

[l6]...

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Why Lagrange L4/L5?

Having another View! - L4 and L5 orbits are stable- only require attitude control

for exact positioning & attitude- safe spaces in L2 and L3

for science satellites

First: Second:

NASA/GSFC/Arizona State University [f1]

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Mission Overview:

a) Technical Demonstration Goalsb) Mission Goalsc) Communication Relay as a Serviced) Scientific Goals for Demonstrator Mission

e) Organisatorial

TYCHO-L4/L5 Mission

The innovation is the destination at L4 and to bring communicationservice to the moon for different and not just one organization's endeavor in a cost effective way by using a standard combus.

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a) Technical demonstration goals [TG]:

1. the satellite must be transported into L4 or L5 orbit2. attitude control must be able to keep the satellite in close

distance of the chosen libration point (L4 or L5) (100km)3. the satellite must be able to establish a communication relay

from an earth based ground station to TYCHO-L4/L5 and tolunar surface, lunar orbit and lunar halo orbit

4. the communication field-of-view must include lunar surface,lunar orbits up to 1000km above lunar surface and the halo orbitat L2

5. After end of life (Phase F) the satellite shall make room and betransported outside the beanorbit of L4/L5. A grave-yard orbitshould be avoided.

6. Serving as a demonstrator for future expansion stages andspin-offs

Mission Objectives & Analysis

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b) Mission goals [MG]:

1. Operation time of 15 years=> comparable to GEO Com-Sats

2. the communication system shall be a standard satellite bus=> Commercial off-the-Shelf 

3. the communication system must be designed with space agenciesand administrations and private/commercial endeavors to create auniversally compatible system

=> possible task for SGAC's „Agencies“ Working Group?

Mission Objectives & Analysis

BSS-702MP (Intelsat 21) [Boeing BSS] [f2]

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c) Communication Relay as a Service [CRS]:

1. TYCHO-L4/L5 can be transported in a dual moon mission andservice as a relay station for this mission

2. After inauguration mission, follow-up science missions shouldregularly use TYCHO-L4/L5

to high capacity. This can only be achieved with joined efforts of further lunar missions.

Mission Objectives & Analysis

[f3] [f4] [f5]

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d) Scientific goals for the demonstrator mission [SGD]:

1. the satellite can be used for earth-l4-earth,earth-l4-lunar-l4-earth measurements

2. a dust-sensor for measuring dust and micro-meteorite density inthe libration trap for long life-time estimation.

=> only for inauguration mission.

Understanding of the Lagrange-Point L4/L5

Mission Objectives & Analysis

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e) Organisatorial on International Level:

- What to do after End-of-Life?Define Lagrange Graveyard

- Harmonize CommunicationDefine System, Frequencies and Protocols

- Efficient UsageFind enough relay bookers during operationtime for return of investment

Mission Objectives & Analysis

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TYCHO Demonstrator leading to „Productive Models“- Knowledge basis for future missions

Agencies Cooperation Spin-Off 

b y

Knowledge transfer beyond Earth-Lunar-Libration Points

Mission Derivates

[l9]

[l8]

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Inspiration

Arthur C. Clarke's

[f6]

[5]

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Inspiration

Thank you for your Attention!

Any Questions?

Arthur C. Clarke's

or email to andreas.hornig@aerospaceresearch.net[f6]

[5]

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InspirationFly me to the Moon!

Have an awesome time in Cape Town!

by wirelessmonkey [f7]

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More TYCHO-L4/L5:

Paper: http://bit.ly/qOsb1j (on spacegeneration.org)Video: http://www.youtube.com/user/andreashornig

Sources:[1] http://astrobotic.net/2011/02/06/astrobotic-technology-announces-lunar-mission-on-spacex-falcon-9[2] http://www.googlelunarxprize.org/prize-details[3] http://www.esa.int/esaCP/SEM83CIK97G_Life_0.html

[4] http://en.wikipedia.org/wiki/List_of_current_and_future_lunar_missions#Under_development[5] http://en.wikipedia.org/wiki/2001:_A_Space_Odyssey by Arthur C.Clarke

Image Sources:[BG] http://upload.wikimedia.org/wikipedia/commons/9/9a/Mare_Imbrium-Apollo17.jpg[f1] http://www.nasa.gov/mission_pages/Mini-RF/multimedia/erlanger_crater.html[f2] http://www.boeing.com, photo taken from http://space.skyrocket.de/doc_sat/hs-702.htm

[f3] http://www.aprizesat.com/gallery.php[f4] http://hindu.com/2007/01/10/images/2007011005661501.jpg[f5] http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34697[f6] MGM (original), Warner Bros. (current). Screenshot from http://www.ee.ryerson.ca/~elf/aso/[f7] www.panoramio.com/photo/31816

Logos:

[l1] OHB [l3] Space X [l5] NASA [l7] Eutelsat[l2] Google Lunar X-PRIZE [l4] ESA [l6] DLR [l8] SES Astra

Appendix