"Key infrastructure technologies for sustained human exploration of the Moon and Mars"
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Transcript of "Key infrastructure technologies for sustained human exploration of the Moon and Mars"
Key infrastructure technologies for sustained human exploration of the
Moon and Mars
Marco Lisi European Space Agency
Summary
• The exploration of Moon and Mars with human and robotic missions and their colonization, through the establishment of permanent bases, will require planetary communications and navigation infrastructures;
• All architectural approaches considered so far by NASA and ESA can be divided in two main categories: – Comprehensive, well structured and forward looking (but costly)
architectures, based on constellations of orbiters and relay satellites – “ad hoc”, flexible, expandable architectures, based on a fusion of all
available resources and on COTS technologies
• A Public-Private Partnership (PPP) business model can be envisioned, with national space agencies sharing investment costs with major commercial players (Apple, IBM, Google, AT&T, etc).
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Outline
• Can we use GNSSs beyond Earth Orbit and on the Moon? • A review of NASA and ESA proposed system architectures for
communications and navigation infrastructures on Moon and Mars;
• An integrated, commercially-oriented approach to the problem;
• Space is not new to commercialization and sponsorships; • A Public-Private Partnership (PPP) business model for the
exploration of Moon and Mars; • Conclusions
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Can we use GNSS (GPS) beyond Earth Orbit and on the Moon? • GPS signals effective up to the Earth-Moon 1st Lagrange Point (L1)
– 322,000 km from Earth – Approximately 4/5 the distance to the Moon
• GPS signals can be tracked to the surface of the Moon, but usable with advanced GPS receiver technology
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SCaN: NASA Space Communication and Navigation Integrated Network
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SCaN: NASA Space Communication and Navigation Integrated Network
Objectives: • to develop a unified space communications and navigation
network infrastructure capable of meeting both robotic and human exploration mission needs;
• to provide the end space communication and navigation infrastructure on Lunar and Mars surfaces;
• to provide anytime/anywhere communication and navigation services as needed for Lunar and Mars human missions.
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SCaN: Three Main Networks
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SCaN: Moon Relay Capability
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SCaN: Mars Relay Capability
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AEGIS: NASA Study on Moon and Mars Communications and Navigation Constellations
Objectives: • to provide a flexible communications and navigation
infrastructure supporting human and robotic missions to the Moon and Mars;
• to provide navigational support to mission elements with a minimum 100 m resolution;
• to provide communication between mission elements and mission operations with availability of 95%;
• to use existing technology to reduce cost; • to be based on small, highly manufacturable satellites
reducing cost and engineering time.
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AEGIS: Lunar Constellation Design • Six Orbiters per plane at 4,800 km – Spaced evenly at 60° – Meets “three in the sky” requirement for two planes – Three planes offers complete lunar coverage • Two Relays in high polar orbit at 10,000 km – Spaced at 180°
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AEGIS: Mars Constellation Design • Nine Orbiters per plane at 9,500 km – Spaced evenly at 40° – Meets “three in the sky” requirement for two planes – Three planes offers complete martian coverage • Two Relays in high polar orbit at 19,800 km – Spaced at 180°
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AEGIS: Spacecraft Mass and Power Budgets
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PLANCOM: ESA Feasibility Study for a Reduced Planetary Navigation & Communication System
• Planetary infrastructure for future robotic and manned missions on Moon or Mars;
• Communication and navigation network using an integrated signal to provide in-situ services, such as high-quality video, audio channels, data network, biomedical data;
• Orthogonal Frequency-Division Multiple Access (OFDMA) signal based on the IEEE 802.16 WiMAX standard;
• Navigation capabilities integrated in the waveform, allowing Time of Arrival (TOA) relative real-time positioning over the planetary surface;
• Non real-time fine positioning using available orbiters, possibly using Earth GNSS signals as additional ranging observables.
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PLANCOM System Architecture
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MOON-GNSS: ESA Study about Use of Weak-Signals GNSS Navigation (1/3)
• Objective: to assess the feasibility of using weak-signal GNSS (GPS/Galileo) technology in future lunar missions, to assist Lunar Transfer Orbit (LTO), Low Lunar Orbit (LLO), Descent and Landing, and operations at landing site
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MOON-GNSS: ESA Study about Use of Weak-Signals GNSS Navigation (2/3)
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MOON-GNSS: ESA Study about Use of Weak-Signals GNSS Navigation (3/3)
• EGNSS: Earth GNSS constellations (GPS/Galileo) • MGNSS: GNSS satellite orbiting around the Moon • MSB: Moon Surface Beacon 19/02/2015 M. Lisi - Space Horizons 2015 18
FATIMA: Fix And TIme provisioning system for MArs
PhD Thesis by Dr. Jozef Kozar, Faculty of Aeronautics, Technical University of Kosice, Slovakia-EU
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Martian GNSS: Open Issues
• Different ionosphere of Mars than the terrestrial ionosphere of Earth (need for an accurate study of the ionosphere of Mars, with total electron content (TEC) in various layers);
• Missing bipolar magnetic field – missing protection against radiation;
• Various range errors caused by signal transition through the different layers of ionosphere of Mars;
• Total electron content in ionosphere is different on dayside hemisphere than on the other side.
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Moon Navigation & Communications Infrastructure: Modular, Expandable, COTS-Based Approach
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Moon Navigation & Communications Infrastructure: Modular, Expandable, COTS-Based Approach
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Moon Navigation & Communications Infrastructure: Modular, Expandable, COTS-Based Approach
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Multi-Sensor, Data Fusion Platforms
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Integrated, Commercially-Oriented Approach to Moon and Mars Communications and Navigations Infrastructures
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Space Commercialization and Sponsorship: an Old (Good?) Idea
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A Public-Private Partnership Business Model for Moon and Mars Colonization
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Conclusions
• The colonization of our solar system, first step of human kind towards the stars, will need establishing permanent base stations on Moon and Mars;
• Planetary infrastructures will provide communications and navigation support to both human and robotic explorers;
• Together with “legacy” architectures, such as the NASA Space Communication and Navigation (SCaN) integrated network, alternative solutions can be envisioned, more based on a fusion of commercial technologies with existing resources (e.g. Earth GNSSs);
• These alternative, COTS-based architectures are well suited for innovative (for space) business models, with large involvement of private capital from sponsoring commercial companies.
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THANK YOU. Questions?