Trajectory optimization algorithms for the earth–moon system.
This package hopes to become a repository for Python and Julia tools for optimizing in the Earth--Moon system. It was a work-in-progress when the spacecraft engineering team at Open Lunar Foundation stopped work, so it has never been properly organized. This document attempts to tell where things can be found.
There are two tools in the repository. They are in (mostly) separate
branches. The first tool, the Python patched conic cislunar trajectory
generator, is in the master branch. It relies on the sequential
gradient restoration algorithm to find a minimum delta-v solution. Its
usage documentation is below.
The second tool is a Julia tool which solves the same problem using
the circular restricted three-body problem. The challenge was to
create for a trajectory which roughly copied that of Beresheet,
allowing for more robust launch windows and greater flexibility in
midcourse maneuvers. This tool is located in branch jared, in the
beresheet directory.
See beresheet/README.md in the jared branch for the CR3BP tool's
requirements, installation, usage, contribution information, and
license.
- Python 3.x
- Numpy
- SciPy
- Matplotlib
Clone this repository:
git clone https://github.com/openlunar/trajectory.git
Currently, this tool cannot be installed as a package. You must run it out of the repository directory. Forward work includes converting it to a package with optimization functions that can be called from other scripts.
To checkout the CR3BP Julia code, do
git checkout jared
cd beresheet/
Most scripts are in the project root directory. These can be run from a shell, e.g.
python3 trajectory.py
If you find a bug or wish to make a contribution, use the project's github issue tracker.
Copyright (c) 2020, John O. "Juno" Woods, Jared Blanchard, and Open Lunar Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.