Java Tricks

Disqus:

必须所有 Parents 实现 Serializable 才行。 https://stackoverflow.com/questions/9747443/java-io-invalidclassexception-no-valid-constructor

IMU Calibration Learning Notes

Edited on 2019-10-11 In Academics , Notes , Techniques , Calibration , Web Post Notes , Hardwares Disqus:

问题

学习 attitude estimation 算法
- QUEST
- TRIAD

Gaussian Process is a plural noun describing a random function with assumed Gaussian joint distribution

Edited on 2019-10-01 In Summaries Disqus:

Again, I run into the question that “what’s the difference between GP and GPs”? Here, GP is Gaussian process while GPs is Gaussian processes. So you see the difference?

In this post, I decided to solve this confusion (a better words? puzzle? bewilderment? perplexity?) once and for all.

Collection of Good YouTube Videos

Edited on 2019-09-03 In Collections , Languages , YouTube , Listening Disqus:

一些值得收藏的YouTube视频，以及一些摘要。

Summary of NASA NIAC Projects

Edited on 2019-08-29 In Academics , Summaries , Aerospace Disqus:

NIAC 2019 Phase I Selections

https://www.nasa.gov/directorates/spacetech/niac/2019_Phase_I_Phase_II/

Aerospace Conference Notices

Edited on 2019-08-27 In Information Disqus:

Call-for-abstract Open

Open | Conference Date | Name | Location | Abstract Deadline (chronological order)
| 20200518-20 | 16th International Conference on Space Operations (SpaceOps 2020) | Cape Town, South Africa | 20190831
| 20200130-0205 | 43rd Annual AAS Guidance, Navigation and Control Conference - Rocky Mountain Region | Breckenridge, Colorado | 20190906
| 20200316-20 | 51st Lunar and Planetary Science Conference | The Woodlands, Texas | null
| ??? | International Conference on Astrodynamics Tools and Techniques (ICATT) | future | null
| 20190625-27 | 2nd IAA/AAS SciTech Forum | Moscow, Russia | 20190518

Mistakenly Used or Understood Word

Edited on 2019-08-08 Disqus:

Conjunction Analysis
satellite orbital conjunction
NOT ~~conjuncture~~ analysis !

In practice, not ~~in the practice~~.

successively v.s. consecutively

start v.s. conduct

All about Two-Line Elements

Edited on 2019-07-24 In Academics , Summaries , Aerospace Disqus:

This is some collections and summaries of TLE-related papers in my Zotero collection. Questions and discussions are welcomed.

Publications summarized here are all worth studying.

(Some notes are in Chinese.)

aerospace-atmosphere-model

Edited on 2019-07-06 In Academics , Summaries , Aerospace Disqus:

DTM2000

See Orekit implementation here.

It is described in the paper:

The DTM-2000 empirical thermosphere model with new data assimilation and constraints at lower boundary: accuracy and properties S. Bruinsma, G. Thuillier and F. Barlier
Journal of Atmospheric and Solar-Terrestrial Physics 65 (2003) 1053–1070

This model provides dense output for altitudes beyond 120 km.

The model needs geographical and time information to compute general values, but also needs space weather data : mean and instantaneous solar flux and geomagnetic indices.

Mean solar flux is (for the moment) represented by the F10.7 indices. Instantaneous flux can be set to the mean value if the data is not available. Geomagnetic activity is represented by the Kp indice, which goes from 1 (very low activity) to 9 (high activity).

All these data can be found on the NOAA (National Oceanic and Atmospheric Administration) website.

About Tracker Component Library

Edited on 2019-07-03 In Techniques , Softwares Disqus:

USNavalResearchLaboratory/TrackerComponentLibrary at GitHub

The Tracker Component Library is a collection of Matlab routines for simulating and tracking targets in various scenarios. Due to the complexity of the target tracking problem, a great many routines can find use in other areas including combinatorics, astronomy, and statistics.

Recently, I ran into a very comprehensive MATLAB repository, which is very rare to my knowledge. Usually people find comprehensive packages in other languages, like Orekit in Java, GMAT in C++, many others in Python, and even one in Julia.
So, I decide to have a look at it and take nots here.