PDF document and interactive MATLAB script named ilt_opt.m that can be used to analyze and optimize two-dimensional, heliocentric low-thrust trajectories between the orbits of Earth and Mars. In this script, the heliocentric planet orbits are assumed to be circular and coplanar. The optimal steering angle for either (1) minimum transfer time or (2) maximum final mass, are modeled as piecewise-linear variations. For both options, this script attempts to minimize the accumulated delta-v required to perform the transfer. Since the propulsive thrust is constant and continuous in this script, this is equivalent to minimizing the transfer time or maximizing the final mass.
me (msagha...@gmail.com change)
1:16 PM (1 hour ago)
I would like please help me in the following problem:
I use student-version Matlab mex-files of SNOPT, and also have added the directory where the mex-file is located to the Matlab path and am working in the same directory.
Besides, mex -setup FORTRAN is Ok. And my system includes:
Win 7, 64bit,
Visual Studio Ultimate 2013,
But, there is this error after running my Matlab code:
Undefined function 'snopt' for input arguments of type 'double'.
Error in ilt_opt (line 179)
[x, f, inform, xmul, fmul] = snopt(xg, xlb, xub, flow, fupp, 'ilt_shoot');
The ilt_opt_64bit.m version should be used with the 2015 (version 7.5) of SNOPT.
Added main script (ilt_opt_64bit.m) that uses the March 17, 2014 version of SNOPT.
Calculates departure and arrival dates for rendezvous from user's initial guess.