Time Series for LEO
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README <br> <strong>1. Introduction</strong> <br> <br> <strong>1.1</strong> This folder contains time series for the elevation angle obtained from simulations for the following orbit altitudes: <br> 1. 1000 km 2. 1200 km 3. 1400 km 4. 1600 km 5. 1800 km 6. 2000 km <br> <br> <strong>1.2</strong> For each altitude, the following orbit inclinations where considered: <br> 20º, 25º, 30º, ..., 85º <strong>1.3 </strong>The elevation angle time series were observed from 16 Earth Station's, ES's. Those ES's are numbered and located* as follows: <br> 1. ES1 = ( 0º, 276.7121º) 2. ES2 = ( 5º, 276.7121º) 3. ES3 = (10º, 276.7121º) 4. ES4 = (15º, 276.7121º) 5. ES5 = (20º, 276.7121º) 6. ES6 = (25º, 261.7121º) 7. ES1 = (30º, 259.7121º) 8. ES2 = (35º, 259.7121º) 9. ES3 = (40º, 259.7121º) 10. ES4 = (45º, 259.7121º) 11. ES5 = (50º, 259.7121º) 12. ES6 = (55º, 259.7121º) 13. ES7 = (60º, 259.7121º) 14. ES8 = (65º, 259.7121º) 15. ES9 = (70º, 259.7121º) 16. ES10 = (75º, 259.7121º) 17. ES11 = (80º, 259.7121º) 18. ES12 = (85º, 259.7121º) <br> *Location for the ES's is provided in cartesian format: (latitude in deg, longitude in deg) <strong>1.4</strong> The eccentricity for all the simulations correspond to that of a circular orbit. <br> <br> <strong>1.5</strong> For organization convenience, all the time series files are organized within six folders according to their orbit altitudes. <br> <br> <strong>1.6</strong> Files in this folder are provided to facilitate reproduction of our work and to encourage future work based on our proposed methodology and results. <br> <br> <br> <br> <br> <br> <strong>2. General description</strong> <br> <br> <strong>2.1</strong> Time series filenames Each time series is identified with the following character format: <br> "hhhh-ii-ES#.csv". where: hhhh indicates the orbit altitude ii indicates the orbit inclination ES# indicates the ES from which the elevation angle is being observed <br> <br> <strong>2.2</strong> Time series length Elevation angle time series are provided for a simulation period of 180 days. <br> <br> <br> <br> <br> <br> <strong>3. File format</strong> <br> <strong>3.1</strong> Time series are provided using the .csv (comma separated values) file format to facilitate reading through diverse programming tools. <br> <strong>3.2</strong> Each time series is provided as an individual two-column .csv file. The first column contains the time vector and the second contains the corresponding elevation angle vector. <br>
README <strong>1. 引言</strong> <strong>1.1</strong> 本文件夹包含针对以下轨道高度通过仿真得到的仰角时间序列：1. 1000 km；2. 1200 km；3. 1400 km；4. 1600 km；5. 1800 km；6. 2000 km。 <strong>1.2</strong> 针对每个轨道高度，本次仿真考虑了如下轨道倾角：20°、25°、30°……85°。 <strong>1.3</strong> 上述仰角时间序列来自16个地球站（Earth Station，ES）的观测数据。这些地球站已完成编号并按如下坐标定位*：1. ES1 = (0°, 276.7121°)；2. ES2 = (5°, 276.7121°)；3. ES3 = (10°, 276.7121°)；4. ES4 = (15°, 276.7121°)；5. ES5 = (20°, 276.7121°)；6. ES6 = (25°, 261.7121°)；7. ES1 = (30°, 259.7121°)；8. ES2 = (35°, 259.7121°)；9. ES3 = (40°, 259.7121°)；10. ES4 = (45°, 259.7121°)；11. ES5 = (50°, 259.7121°)；12. ES6 = (55°, 259.7121°)；13. ES7 = (60°, 259.7121°)；14. ES8 = (65°, 259.7121°)；15. ES9 = (70°, 259.7121°)；16. ES10 = (75°, 259.7121°)；17. ES11 = (80°, 259.7121°)；18. ES12 = (85°, 259.7121°)。*注：地球站的位置采用直角坐标格式给出：(纬度，单位为度；经度，单位为度)。 <strong>1.4</strong> 本次所有仿真的轨道偏心率均与圆轨道一致。 <strong>1.5</strong> 为便于组织管理，所有时间序列文件将按照轨道高度分为6个子文件夹进行存储。 <strong>1.6</strong> 本文件夹内的文件旨在方便复现本研究工作，并推动基于本文提出的方法与结果开展后续研究。 <strong>2. 总体说明</strong> <strong>2.1</strong> 时间序列文件名 每条时间序列的文件名遵循如下格式："hhhh-ii-ES#.csv"。其中：hhhh代表轨道高度；ii代表轨道倾角；ES#代表用于观测仰角的地球站编号。 <strong>2.2</strong> 时间序列时长 本次提供的仰角时间序列对应的仿真周期为180天。 <strong>3. 文件格式</strong> <strong>3.1</strong> 时间序列采用逗号分隔值（Comma-Separated Values，CSV）格式存储，以便于通过各类编程工具读取。 <strong>3.2</strong> 每条时间序列均以独立的两列CSV文件形式提供：第一列为时间向量，第二列为对应的仰角向量。
