trajectorize 0.0.10

KSP Trajectory Optimization

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KSP Trajectory Optimizer.

This project is a reduced-scope version of one of my other (currently incomplete) projects, as an intermediate stepping stone.

This tool computes trajectories between celestial bodies in KSP based on on-rails two-body patched conics, incorporating trajectory correction maneuvers for a variety of mission scenarios, such as:

• Ballistic Hohmann transfers for other planets
• Gravity assist flyby routes

Computationally-intensive code is implemented in C, with a Python wrapper made using cffi. C code follows mostly C89, with some C99 features used. It has been tested against the latest versions of GCC (on Linux) and MSVC (on Windows 10).

Installation

The simplest way to install is from PyPI:

pip install trajectorize

This will install the latest stable version of the package, and may include pre-compiled binaries for your platform.

The package is still in development, so you may want to install from the latest commit on the main branch instead:

Run pip install git+https://github.com/itchono/trajectorize to install the package from source.

You will need to have Python 3.8+, and a C compiler installed to compile the C code if installing from source. You will also need a C compiler installed if there are no pre-compiled binaries for your platform. If you're on Windows, you can find details about installing a C compiler here.

The following platforms/compilers have been tested:

Platform	Compiler
Windows 10	MSVC 14.16 (Visual Studio 2017)
Ubuntu 20.04 LTS (Dev Machine)	GCC 9.4.0

Demos

Right now, full functionality is incomplete. There are, however, some cool demos showing off the capabilities of the package.

Full Model of KSP Planetary System and Ephemerides

python -m trajectorize.demos.kerbol_system_anim

Calculation of Ballistic Interplanetary Transfers Using Lambert's Problem

python -m trajectorize.demos.kerbin_duna_transfer

Propagation of Two-Body Trajectories Using Universal Keplerian Elements

python -m trajectorize.demos.orbit

Calculations of Optimal Transfers, Porkchop Plots

python -m trajectorize.demos.single_transfer Kerbin Duna --capture_alt 60000

Inspirations

• Interactive illustrated interplanetary guide and calculator for KSP, by Olex
• Launch Window Planner, by AlexMoon