N-body Lunar Free Return Trajectory Analysis – OTB

版本 1.1.0 (112.1 MB) 作者: David Eagle
Design and optimization of lunar free-return trajectories. Target to a final mission orbit or entry interface at Earth.
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更新时间 2024/9/25

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This is a MATLAB script named nbody_lfr_otb that can be used to design an n-body, lunar free-return transfer trajectory from a circular, low Earth orbit (LEO) to a final user-defined Earth orbit radius and orbital inclination.
The n-body equations of motion implemented in this script include non-spherical Earth gravity and the point-mass gravity of the sun and moon.
The major computational steps of this divide and conquer script are as follows;
Step 1 - Solve the two-body, lunar zero sphere-of-influence (ZSOI) Lambert problem while minimizing the trans-lunar injection (TLI) delta-v magnitude
Step 2 - Using the two-body solution from Step 1 as an initial guess, target to user-defined B-plane coordinates at the moon again minimizing the TLI delta-v magnitude
Step 3 - Using the n-body solution found in Step 2 as an initial guess, target to user-defined final orbit or entry interface conditions.
This script uses the fmincon algorithm from the Mathworks® Optimization Toolbox to solve each step. Orbital events are determined using the event prediction feature of the ode45 algorithm.
The nbody_lfr_otb script uses routines from the MICE software suite to read and evaluate the JPL ephemeris file. Platform-specific MICE mex files, support functions and the binary ephemeris file (de430.bsp) are available at naif.jpl.nasa.gov/naif/toolkit_MATLAB.html. MICE is a MATLAB implementation of the SPICE library created by JPL.

引用格式

David Eagle (2024). N-body Lunar Free Return Trajectory Analysis – OTB (https://www.mathworks.com/matlabcentral/fileexchange/164071-n-body-lunar-free-return-trajectory-analysis-otb), MATLAB Central File Exchange. 检索来源 .

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版本 已发布 发行说明
1.1.0

Updated/improved MATLAB source code and PDF user's guide
1.0.0