unable to use Aerospace Blockset function eci2ecef

8 次查看（过去 30 天）
Eduardo Rodrigues Silva Filho
评论： lai 2023-8-24
Hi, I need to a function to transform acceleration data from ECI to ECEF frame and I found this function on Aerospace Blockset which does exactly what I need (https://www.mathworks.com/help/aeroblks/eci2ecef.html). However, I was unable to use it within a normal matlab script. I tried one of the example codes from the help center:
r_eci = [-2981784 5207055 3161595];
utc = [2019 1 4 12 0 0];
mjd = mjuliandate(utc);
pm = polarMotion(mjd, 'action', 'none')*180/pi;
r_ecef = eci2ecef(utc, r_eci, 'pm', pm)
And I got the following error:
Unrecognized function or variable 'eci2ecef'.
Is it possible to use this function outiside of Simulink in a normal script? Does anyone knows a good replacement for this function?
Thanks

请先登录，再回答此问题。

采纳的回答

Divya Yerraguntla
Divya Yerraguntla 2020-3-30
Hi Eduardo,
The "eci2ecef" is part of the set of function in CubeSats hence the function requires the 'Aerospace Blockset CubeSat Simulation Library' Add-on support package. You could download this from the Add-ons manager.
Hope it helps!

更多回答（1 个）

Seth Wagenman
Seth Wagenman 2020-9-3
Try importing Python's pymap3d package and using it instead as described at:
https://github.com/geospace-code/matmap3d/issues/3#issuecomment-686521080
Unfortunately, you have to convert your MATLAB datetime objects to datenum and then do some math on them before passing over to Python, as described here:
https://github.com/geospace-code/matmap3d/issues/3#issue-690418768
The Python astropy package is the basis for the coordinate transformations and it works quite well. It is a bit slow and I recommend installing the MATLAB API for Python and using a custom Python function which returns MATLAB data objects instead of numpy arrays, which will then require extra conversion within MATLAB anyway before you can use them; see this answer for a work-around if you do not have administrative privileges:
https://www.mathworks.com/matlabcentral/answers/216498-passing-numpy-ndarray-from-python-to-matlab#answer_487604
Hope it works! I would love a comparison between what MATLAB spits out for Null Island's ECI coordinates on January 1, 2000 at noon UTC (using the leap seconds option) to compare. The python code returns (1158174.7900579234, -6272101.938428859, -143.09802467421062).

类别

在 Help Center 和 File Exchange 中查找有关 Unit Conversions 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by