deep space communication next-gen

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Next Generation DSNNational Aeronautics and SpaceAdministrationJet Propulsion LaboratoryCalifornia Institute of Technology

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A Vision for the

Next GenerationDeep Space Network

Bob PrestonChief ScientistInterplanetary Network Directorate, JPL

Les DeutschArchitecture and Strategic PlanningInterplanetary Network Directorate, JPL

Barry GeldzahlerProgram Executive, Deep Space NetworkScience Mission Directorate, NASA


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The Challenge for Deep Space Communications

Over the next 30 years deep space communication will have toaccommodate orders-of-magnitude increase in data to and from

spacecraft and at least a doubling of the number of supportedspacecraft

The present DSN architecture is not extensible to meet future needs ina reliable and cost effective manner

NASA must develop a new strategy for deep space communicationsthat meets the forthcoming dramatic increase in mission needs


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What is the Present Deep Space Network?

CanberraGoldstone

Madrid

Three major tracking sites around the globe, with 16 large antennas,provide continuous communication and navigation support for the worldsdeep space missions

Currently services ~ 35 spacecraft both for NASA and foreign agencies

Includes missions devoted to planetary, heliophysics, and astrophysicalsciences as well as to technology demonstration

Spigot for science data from most spacecraft instruments exploring thesolar system, as well as a critical element of radio science instruments

A $2B infrastructure that has been critical to the support of 10s of $B ofNASA spacecraft engaged in scientific exploration over the last few decades

N i l A i d S


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Why Does NASA Need a Next Generation DSN?

Many of the current DSN assets are obsolete or well beyond the end of theirdesign lifetimes The largest antennas (70m diameter) are more than 40 years old and are not suitable for

use at Ka-band where wider bandwidths allow for the higher data rates required for

future missions Current DSN is not sufficiently resilient or redundant to handle future mission demands

Future US deep space missions will require much more performance thanthe current system can provide

Require ~ factor of 10 or more bits returned from spacecraft each decade Require ~ factor of 10 or more bits sent to spacecraft each decade

Require more precise spacecraft navigation for entry/descent/landing and outer planetencounters

Require improvements needed to support human missions

NASA has neglected investment in the DSN, and other communicationsinfrastructure for more than a decade Compared to 15 years ago, the number of DSN-tracked spacecraft has grown by 450%,

but the number of antennas has grown only by 30%

There is a need to reduce operations and maintenance costs beyond thelevels of the current system

National Aeronautics and Space


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NASAs Science Missions are Changing

Low-Earth-orbit solarand astrophysicalobservatories.

Single, large spacecraftfor solar &astrophysics obs.

Preliminary solarsystem reconn. viabrief flybys.

In situexplorationvia short-livedprobes.

Observatories locatedfarther from Earth.(e.g., Spitzer, JWST)

Constellations of small,low-cost spacecraft.(e.g., MMS, MagCon)

Detailed OrbitalRemote Sensing.

In situexp. via long-lived mobile human &

robotic elements.

MGS, Mars Odyssey, & MRO will obtain high resolution images of only about 1% of Marssurface

Data rate is a constraint on the ability to understand the planet

Science and human exploration missions need remote sensing as now done for the Earth

509/09/05Evolution of the Deep Space NetworkEvolution of the Deep Space Network


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N t G ti DSNNational Aeronautics and Space


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Next Generation DSNAdministrationJet Propulsion LaboratoryCalifornia Institute of Technology

DSN Performance Gap

1 bps

1 Kbps

1 Mbps

1 Gbps

1 Tbps

1 Pbps

10,000 km 100,000 km 1 Mkm 10 Mkm 100 Mkm 1 Bkm 10 Bkm 100 Bkm

GEO Moon Mars

Jupiter

Pluto

Edge of

Solar System

CurrentDSNSensitivity

(70mantennaatX-band)

Mission Requirements out to 2030

1,000-fold increase is needed to support planetary missions

Adequate sensitivity already exists for all lunar and Earth libration point missions

Next Generation DSNNational Aeronautics and SpaceAd i i i


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Next Generation DSNAdministrationJet Propulsion LaboratoryCalifornia Institute of Technology

Planning for the DSN Future

NASA and JPL have generated a roadmap for the DSN based on requirementsderived from analysis of probable future mission sets

This DSN roadmap is being integrated into an overall NASA Space CommunicationsProgram Plan by the NASA Space Communications Architecture Working Group(SCAWG)

The SCAWG made recommendations about the future of space communications tothe NASA Administrator (Griffin) and the NASA Strategic Management Council

The NASA Administrator declared that NASA has neglected the DSN andcommunications infrastructure investment and asked that a plan be ready to deliver to

Congress in February 2007

Planning process:


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Next Generation DSNJet Propulsion LaboratoryCalifornia Institute of Technology

Example Benefits of Future DSN to NASA Missions

Orders of magnitude increase in downlink data rates Video instead of single images

Improved multi-spectral imaging

Increased temporal and/or spatial resolution

Increased wavelength and/or geographical coverage Room to grow to support the human exploration era

Including intense robotic exploration of Mars

Orders of magnitude increase in up uplink data rates

Enables expected growth of software uploads and human

communication needs Same instrument performance much farther from Earth

Direct-to-Earth transmission can enable new missionconcepts for probes, rovers, and balloons

Hemispherical planet coverage (e.g., for multiple probes,longer communication periods)

Improved position/velocity measurements (e.g., for winds)

Improved mission parameters/cost

Higher link sensitivity could be used to lower spacecraft

power, mass, pointing accuracy requirements, Improved data-rate from low-gain antennas during descent

and landing or spacecraft emergencies

Single high performance user, or

Multiple users on sub-arrays

Flexibility of theArray Architecture


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deep space communication next-gen

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