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IEEE Aero update & final acta citation
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olamarre committed Nov 19, 2023
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21 changes: 14 additions & 7 deletions _pages/recovery-policies-psr-exploration.md
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[<i class="fa fa-github" aria-hidden="true"></i> gplanetary_nav on Github](https://github.com/utiasSTARS/gplanetary-nav){: .btn .btn-green }

### Olivier Lamarre, Shantanu Malhotra, Jonathan Kelly
#### Article currently under review, to appear in the Acta Astronautica journal

#### Article [published](https://doi.org/10.1016/j.actaastro.2023.09.028) in the Acta Astronautica journal


<!-- As part of this publication, we release the [`gplanetary_nav`](https://github.com/utiasSTARS/gplanetary-nav) Python library, an open-source repository to facilitate the interface between orbital data and global navigation planning algorithms in support of long-range/strategic planetary mobility. -->

## Overview

{::nomarkdown}
{::nomarkdown}
<div class=figure style='text-align:center'>
<img src='/assets/recovery-policies-psr-exploration/overview_lunar_bg_lowres.png' width='100%' />
<figcaption>With a solar-powered rover affected by random navigation delays, the safest way out of a PSR is dictated by the probability of survival of the rover, not the physically shortest path. Impact of faults on the safety of a solar-powered rover exiting a PSR. In subfigure A, the dashed line shows the path generated by a hypothetical risk-agnostic offline spatiotemporal planner. The blue arrow shows an action returned by a hypothetical online, risk-aware planner. A fault occurring early into the traverse (subfigure B) not only invalidates the offline plan, but in this case it also prevents the rover from being exposed to sunlight no matter where it exits the PSR (subfigure C). On the other hand, a risk-aware online planner can, by design, proactively account for stochastic faults (see blue path). In this conceptual example, the online planning methodology leads the rover to sunlight (subfigure D). Background image courtesy of NASA and Arizona State University. VIPER render courtesy of NASA.</figcaption>
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## Citation
<pre wrap='true'>
@unpublished{lamarre2023recovery,
author = {Olivier Lamarre and Shantanu Malhotra and Jonathan Kelly},
title = {Recovery Policies for Safe Exploration of Lunar Permanently Shadowed Regions by a Solar-Powered Rover},
note = {Acta Astronautica (submitted)},
year = {2023},
@article{lamarre_recovery_2023,
title = {Recovery policies for safe exploration of lunar permanently shadowed regions by a solar-powered rover},
volume = {213},
issn = {0094-5765},
doi = {10.1016/j.actaastro.2023.09.028},
urldate = {2023-11-18},
journal = {Acta Astronautica},
author = {Lamarre, Olivier and Malhotra, Shantanu and Kelly, Jonathan},
month = dec,
year = {2023},
pages = {708--724},
}
</pre>
7 changes: 4 additions & 3 deletions _pages/safe-mission-level-planning.md
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# Safe Mission-Level Path Planning for Exploration of Lunar Shadowed Regions by a Solar-Powered Rover

### Olivier Lamarre, Shantanu Malhotra, Jonathan Kelly
#### Article currently under review, to appear at the 2024 IEEE Aerospace Conference

#### Article accepted in the 2024 IEEE Aerospace Conference


<!-- As part of this publication, we release the [`gplanetary_nav`](https://github.com/utiasSTARS/gplanetary-nav) Python library, an open-source repository to facilitate the interface between orbital data and global navigation planning algorithms in support of long-range/strategic planetary mobility. -->

## Overview

{::nomarkdown}
{::nomarkdown}
<div class=figure style='text-align:center'>
<img src='/assets/safe-mission-level-planning/overview_lunar_bg_lowres.png' width='100%' />
<figcaption>The importance of risk-aware planning when exploring PSRs with a solar-powered rover affected by recurring random faults. Subfigure A shows a nominal mission plan visiting waypoints of interest in a given order. After a fault/delay occurs during the traverse (subfigure B), risk-aware planning (blue dashed line) suggests an early PSR exit while risk-agnostic planning (white dashed line) finds an updated plan visiting the fourth waypoint, unaware of how dangerous this traverse schedule is. If a second fault occurs inside of the PSR (subfigure C), a rover following the risk-agnostic plan misses a crucial solar charging period; battery energy depletion becomes unavoidable (subfigure D). A rover following the risk-aware plan, on the other hand, is still capable of reaching the designated target region safely. Background image courtesy of NASA and Arizona State University. VIPER render courtesy of NASA.</figcaption>
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@unpublished{lamarre2024safe,
author = {Olivier Lamarre and Shantanu Malhotra and Jonathan Kelly},
title = {Safe Mission-Level Path Planning for Exploration of Lunar Permanently Shadowed Regions by a Solar-Powered Rover},
note = {2024 IEEE Aerospace (submitted)},
note = {2024 IEEE Aerospace (accepted)},
year = {2024},
}
</pre>

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