Venus Aerial Platforms Study

James A. Cutts1, Jeffery L. Hall1, Larry H. Matthies1

& Thomas W. Thompson 1 and Members of the Venus Aerial Platform Study Team

June 11, 2018

1. Jet Propulsion Laboratory, California Institute of Technology

© 2018 California Institute of Technology. Government sponsorship acknowledged.

• Motivation

• Venus Aerial Platforms Study Overview

• Types of Aerial Platforms Considered

• Trade Study

• Trajectory Models

• Venus Entry Option Space

• Venus Aerial Platforms – Design Sweet Spot

• Science Instruments Trade Study

• Aerial Platform Trajectories – Earth and Venus

• Technology Needs

• Summary

J. Cutts et. al.

Topics

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Pre-Decisional Information -- For Planning and Discussion Purposes Only

• In situ exploration of Venus has been seriously hampered by the severe

environment (T =460C and P=90 bars) of the Venus surface.

• Contemporary concepts for lander missions to Venus have more

sophisticated instruments but do not survive on the surface of Venus for

very much longer than Soviet- era Venera landers

• There are two plausible pathways to long-duration Venus in-situ missions

– Aerial Platforms operating in the temperate regions of the upper atmosphere

– Surface Platforms utilizing high temperature electronics

• NASA’s Planetary Science Division (PSD) is currently studying both

pathways for Venus exploration and is considering both concepts as U.S.

provided contributions to a joint mission with Russia (Venera D)

Motivation

3Venus Aerial Platforms Study Pre-Decisional Information -- For Planning and Discussion Purposes Only

• NASA PSD formed a study team in April 2017 to assess the state of

science and technology for aerial platforms and develop a technology plan

• Two face-to-face study meetings were held in June and December 2017

covering the science implementation concept and technical maturity

– Scientific objectives and aerial platform options space (June 2017)

– Technical feasibility and technology roadmap (Dec 2017)

• Since the second meeting the study team has been working on completing

a report with the key findings of the study

• Today’s presentation provides an overview of the principal

accomplishments of the study

• The presentation by Jeff Hall that follows provides a detailed description of

the principal trade study that will appear in our report

Venus Aerial Platforms Study Overview

2Pre-Decisional Information -- For Planning and Discussion Purposes Only Venus Aerial Platforms Study

Types of Aerial Platform Considered

4Venus Aerial Platforms Study Pre-Decisional Information -- For Planning and Discussion Purposes Only

Superpressure Balloon (JPL Venus prototype)

Phase Change Fluid Balloon (JPL)

Air Ballast Balloon (Google Loon)

Mechanical Compression Balloon

(Thin Red Line Aerospace)

Pumped Helium Balloon (Paul Voss CMET)

Hybrid Airship (Northrup Venus Atmospheric Maneuverable Platform (VAMP)

Northrop Grumman

Solar Aircraft (Solar Impulse 2) Geoff Landis (NASA-GRC)

Fixed Altitude Variable AltitudeVariable Altitude and Lateral Control

Venus Aerial Platform – Trade Study

5Pre-Decisional Information -- For Planning and Discussion Purposes Only Venus Aerial Platforms Study

0

50

100

150

200

250

300

350

400

450

500

0 200 400 600 800 1000 1200

Flyi

ng

or

Flo

atn

g M

ass(

kg)

Arrival Mass (kg)

Variable Altitude

Concepts

Flying/Floating and Delivered Mass needed for a 10kg scientific Payload

Fixed Altitude

SP-Balloon

Solar Airplane

Hybrid Airship VAMP

Study TeamJ. Hall (JPL, lead))M. De Jong (TRL:G. Landis (GRC)K. Nock (GAC)D. Sokol (NGC)L. Young (NASA Wallops

Venus Entry System Trade Study

3Venus Aerial Platforms Study Pre-Decisional Information -- For Planning and Discussion Purposes Only

Mission DesignDirect Entry

Orbit from Entry

Science ObjectivesMeasurement

Requirements

Entry VelocityEntry Flight Path Angle Options

Payload Mass and VolumePayload Environment Limits

Payload Deployment ConditionsTrajectory Timeline (Transitions)

Entry System Constraints

Ballistic Coefficient TradesControlled Entry

Ballistic Entry

Entry SystemDesign Space

Entry System Capabilities

• Aerodynamics• Heat Flux (W/cm2)

• Heat Load (J/cm2)

• TPS Capabilities

• Structural Capability

• S/C Accommodations

Entry State

Payload and

Measurement

Details

Study TeamJ. Corliss (LaRC, lead))N. Cheatwood (LaRC)R. Venkatapathy (ARC)P. Wercinski (ARC)

• Entry of most aerial platform concepts feasible with rigid body aeroshell technology• Deployables (ADEPT and HIAD) may provide packaging and deployment advantages

but they are still under development• Dual-function VAMP requires a protracted multistage development/test program

Venus Aerial Platforms – Design Sweet SpotSc

ien

ce V

alu

e

Cost/Risk

Hybrid airship(3D control)

Fixed Altitude Superpressure

Balloon

Altitude-Controlled Balloons

Pre-Decisional Information -- For Planning and Discussion Purposes Only8

Altitude controlled balloons represent a “sweet spot” in the aerial platform option space.

Venus Aerial Platforms Study

Solar Airplane (3D control)

Code Maturity

V. High

High

Moderate

Low

Science TeamR. Grimm (SWRI co lead))L. Glaze (GSFC, co lead) K. Baines (JPL/UW)K. Jessup (SWRI)A. Komjathy (JPL)S. Lebonnois (LMD)S. Limaye (UWisc)K. McGouldrick (UCol)G. Schubert (UCLA)D. Senske (JPL)

Instrument Systems Trade Study – In progress

3Venus Aerial Platforms Study Pre-Decisional Information -- For Planning and Discussion Purposes Only

Study TeamK. Baines (JPL,)D. Atkinson (JPL)S. Krishnamurthy(JPL)L. Matthies (JPL)M. Rais-Zadeh (JPL)

Atmospheric Gas

Composition

Cloud Haze Composition

Atmospheric Structure

Investigations

Geophysical Investigations

Surface Imaging

Aerial Platform Instruments

Drop Sondes

• Experimental techniques identified and evaluated• Instruments with multiple science functions e.g. magnetometers identified• Prospects of miniaturization assessed

J. Cutts et. al.

Altitude Controlled BalloonsCurrent Capabilties at Earth

Venus Aerial Platforms Study

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Pre-Decisional Information -- For Planning and Discussion Purposes Only

Google Loon FlightSeptember 2016Flight duration 190 days

Variable altitude air ballast balloon

Using air currents to navigate

Venus Aerial Platform – Constant Altitude Trajectory Models

6Pre-Decisional Information -- For Planning and Discussion Purposes Only Venus Aerial Platforms Study

Courtesy Sebastien Lebonnois, LMD

• Altitude Control Systems Development

– Design and build subscale models of options.

– Perform laboratory and atmospheric flight tests

– Compare performance of options

– Build full scale model of selected option

• Aerobot Science Module (Gondola) Development

– Demonstrate GN&C and telecommunications systems

– Integrate science instruments

– Incorporate miniaturization (SmallSat and CubeSat technologies)

– Flight test with full scale model

• Modeling and Simulation Tools

– Venus environment– atmospheric circulation and solar and thermal fluxes

– Altitude control systems within the Venus environment

– Power guidance and telecommunications modesl

J. Cutts et. al.

Venus Aerial Platform Technology Needs

Venus Aerial Platforms Study

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Pre-Decisional Information -- For Planning and Discussion Purposes Only

• Venus Aerial Platforms (VAPs) could offer a credible pathway to long

duration in situ missions at Venus. Missions which explore the temperate

zone in the Venus clouds are the place to start

• Focusing on the temperate zone enable us to capitalize on the rich

heritage of conventional sensors and electronic systems.

• Although the VAP technology for the SP platform is almost ready now, a

multi-year investment program focusing on variable altitude capability

would enhance the science capability of these platforms

• Among the opportunities for the application of VAP technology are:

– Joint NASA Russian Venera D Mission Concept– NASA contribution

– Venus Flagship Mission – currently being studied by NASA

– Venus Bridge – atmospheric elements

– Future competitive opportunities – New Frontiers and Discovery

J. Cutts et. al.

Summary

Venus Aerial Platforms Study

Pre-Decisional Information -- For Planning and Discussion Purposes Only

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