Regarding the Installation and Case Reproduction of Tudat

[kelebukuaile]

Hello, I am a beginner in orbital dynamics. I am trying to understand orbital propagation and state parameters by reproducing the grail_odf_estimation.py file in the estimation directory of the tudat-examples. I installed tudatpy for Python 3.10 in a Conda environment following the official tudat installation tutorial, and also downloaded the contents of the two folders: tudatpy-examples and tudat-resources. However, when I thought I had completed all configurations and ran the file, an error occurred. The file download went smoothly at first, but then the system prompted that many library names were not defined. I don’t know how to proceed. Could you please explain how to reproduce grail_odf_estimation.py? Thank you.

[DominicDirkx]

If you can specify the error you got when running the grail_odf_estimation.py file, we can try to help you out!

I should also add that the grail_odf_estimation.py example is one of our more advanced ones, and if you're a beginner in the field it may be better to start with a simpler one and then work your way up to more complex ones like this.

[kelebukuaile]

Thanks

[kelebukuaile]

I'm sorry to trouble you again. I have installed Tudat on Ubuntu following the procedure and tried to run it. However, it informs me that the required SPICE kernel file NOE-4-2020.bsp is missing, which causes the execution failure of the FURNISH loading function in SPICE. I attempted to download it from the naif.jpl.nasa.gov database but couldn't find it. Could you please tell me how to resolve this issue? Thank you.

[kelebukuaile]

I am also missing NOE-5-2021.bsp and NOE-6-2018-MAIN-v2.bsp. Where should I look for them? I look forward to your reply. Thank you.

[DominicDirkx]

https://docs.tudat.space/en/latest/getting-started/faq.html#id8

[kelebukuaile]

Thank you! I just found the resource.tra.gz file you mentioned in the FAQs section of tudat-space. Thank you very much!

[kelebukuaile]

I apologize for bothering you. I was trying to imitate the Doppler measurement estimation example in the GRILITY library of the tudat library and write a Doppler measurement estimation code for Messenger. After some rewriting and downloading the necessary data, I successfully output the image. However, the coordinate axis units of the output image are abnormal, even showing points with units of 10e9, causing line segments to be compressed into straight lines. I'm not sure why this is happening. Is it due to an error in my model, or because I didn't filter out the outliers? Have you encountered this problem before? I look forward to your reply. Thank you!

[DominicDirkx]

I'm not sure what you refer to with 'GRILITY". And, without the code, data and figures you used to make your figures, we can't really help you in your issue