leoss 0.2.20

Low Earth Orbit Spacecraft Simulator

LEOSS

LEOSS is shorthand for Low Earth Orbit Spacecraft Simulator.

This project README is still in construction…

Installation

pip install leoss

Usage

from leoss import *

Groundtracks

Groundtracks, by definition, are the locus of points formed by the points on the Earth directly below a satellite as it travels through its orbit. The practical use case of this feature is for determining satellite orbit position and location relative to a specific point on the Earth or a ground site in particular.

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Example-01: Basic GroundTrack

Python Code:

system = LEOSS()
system.epoch(2023,1,1,12,0,0)

system.addSpacecraft("DIWATA")

spacecraft = system.getSpacecrafts()
recorder   = system.getRecorders()

spacecraft["DIWATA"].setmass(4.00)
spacecraft["DIWATA"].setsize(Vector(0.1,0.1,0.3405))
spacecraft["DIWATA"].setposition(Vector(-3398.36655479e3, 2536.91064491e3,  5312.67851581e3))
spacecraft["DIWATA"].setvelocity(Vector(-5.05043202e3, -5.73213209e3, -0.49795572e3))

time = 60*60*4

simulateProgress(system, time, 4, orbitPropOnly=True)

groundTrack(recorder['DIWATA'])

Terminal Output:

Run Simulation (from 0.0 to 14400, step=4)
Simulating: 100%|█████████████████████████| 14400.0/14400.0 [00:00<00:00, 22944.82it/s]

Elapsed Time:   0.6345400810241699 sec.

The figure above shows the output plot from the line groundTrack(recorder['DIWATA']). The horizontal axis is the longitude ranging from 180°W to 180°E (or -180° to 180°). The vertical axis is the geodetic latitude ranging from 90°S to 90°N (or -90° to 90°). This two-dimensional groundtrack shows the predicted track satellite track over a rotating Earth. The sub-satellite point (the point on Earth where the satellite is directly above), is presented as a white circle, likewise the sun is the yellow circle. The instantaneous position (latitude, longitude and altitude) is annotated with the satellite. The name of the satellite is shown as the title: DIWATA, the instantaneous datetime is also shown after the satellite name.

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Example-02: Animated GroundTrack

Python Code:

system = LEOSS()
system.epoch(2023,1,1,12,0,0)

system.addSpacecraft("DIWATA")

spacecraft = system.getSpacecrafts()
recorder   = system.getRecorders()

spacecraft["DIWATA"].setmass(4.00)
spacecraft["DIWATA"].setsize(Vector(0.1,0.1,0.3405))
spacecraft["DIWATA"].setposition(Vector(-3398.36655479e3, 2536.91064491e3,  5312.67851581e3))
spacecraft["DIWATA"].setvelocity(Vector(-5.05043202e3, -5.73213209e3, -0.49795572e3))

time = 60*60*4

simulateProgress(system, time, 4, orbitPropOnly=True)

animatedGroundTrack(recorder["DIWATA"], sample=4, saveas = 'gif')

Terminal Output:

Run Simulation (from 0.0 to 14400, step=4)
Simulating: 100%|█████████████████████████| 14400.0/14400.0 [00:00<00:00, 22535.73it/s]

Elapsed Time:   0.64249587059021 sec.

Run Animation (from 0.0 to 14396.0, step=16.0)
Animating Ground Track:  10%|██▍                      | 88/900 [00:12<01:56,  6.98it/s]

The figure above shows the output GIF from the line animatedGroundTrack(recorder['DIWATA']), sample=4, saveas='gif'). This is the animated version of the previous example, sampled at every 4th frames.

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Example-03: Counting Passes

Python Code:

system = LEOSS()
system.epoch(2023,1,1,12,0,0)

system.addSpacecraft("DIWATA")

spacecraft = system.getSpacecrafts()
recorder   = system.getRecorders()

spacecraft["DIWATA"].setmass(4.00)
spacecraft["DIWATA"].setsize(Vector(0.1,0.1,0.3405))
spacecraft["DIWATA"].setposition(Vector(-3398.36655479e3, 2536.91064491e3,  5312.67851581e3))
spacecraft["DIWATA"].setvelocity(Vector(-5.05043202e3, -5.73213209e3, -0.49795572e3))

time = 60*60*24*3

simulateProgress(system, time, 4, orbitPropOnly=True)

groundTrack(recorder['DIWATA'])

test_station = GroundStation('TEST_GRS', 12, 122, 5)
passTrack(recorder['DIWATA'], test_station)

Terminal Output:

Run Simulation (from 0.0 to 259200, step=4)
Simulating: 100%|█████████████████████████| 259200.0/259200.0 [00:11<00:00, 22198.93it/s]

Elapsed Time:   11.676238536834717 sec.
#1:     Pass(AOS:2023-01-01 13:08:00, TCA:2023-01-01 13:13:20, MaxElev:37.25320526774923, LOS:2023-01-01 13:18:40, Duration:640.0)
#2:     Pass(AOS:2023-01-01 23:02:12, TCA:2023-01-01 23:07:28, MaxElev:37.66819774201771, LOS:2023-01-01 23:12:48, Duration:636.0)
#3:     Pass(AOS:2023-01-02 00:40:08, TCA:2023-01-02 00:43:56, MaxElev:7.022392466935841, LOS:2023-01-02 00:47:48, Duration:460.0)
#4:     Pass(AOS:2023-01-02 12:19:52, TCA:2023-01-02 12:25:12, MaxElev:40.89032470174465, LOS:2023-01-02 12:30:32, Duration:640.0)
#5:     Pass(AOS:2023-01-02 13:57:56, TCA:2023-01-02 14:01:56, MaxElev:7.704157631282513, LOS:2023-01-02 14:06:00, Duration:484.0)
#6:     Pass(AOS:2023-01-02 22:14:56, TCA:2023-01-02 22:19:12, MaxElev:10.038695486057108, LOS:2023-01-02 22:23:32, Duration:516.0)
#7:     Pass(AOS:2023-01-02 23:50:44, TCA:2023-01-02 23:55:52, MaxElev:29.833762372275316, LOS:2023-01-03 00:01:08, Duration:624.0)
#8:     Pass(AOS:2023-01-03 11:32:52, TCA:2023-01-03 11:37:08, MaxElev:9.948364280656776, LOS:2023-01-03 11:41:28, Duration:516.0)
#9:     Pass(AOS:2023-01-03 13:08:28, TCA:2023-01-03 13:13:36, MaxElev:28.566104657418002, LOS:2023-01-03 13:18:52, Duration:624.0)
#10:    Pass(AOS:2023-01-03 21:29:52, TCA:2023-01-03 21:30:44, MaxElev:0.23096525156636005, LOS:2023-01-03 21:31:36, Duration:104.0)
#11:    Pass(AOS:2023-01-03 23:02:28, TCA:2023-01-03 23:07:48, MaxElev:50.79955505964675, LOS:2023-01-03 23:13:12, Duration:644.0)
#12:    Pass(AOS:2023-01-04 00:40:56, TCA:2023-01-04 00:44:16, MaxElev:4.822331693934615, LOS:2023-01-04 00:47:40, Duration:404.0)
Number of Passes: 12, Ground Radius: 2241175.1615987364 m.

The figure above shows the output GIF from the line animatedGroundTrack(recorder['DIWATA']), sample=4, saveas='gif'). This is the animated version of the previous example, sampled at every 4th frames.

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Animated Attitude Tracking

Animated Sensor Tracking

Support

Roadmap

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropiate.

Authors and Acknowledgement

Main Author: [e-mail]

License

MIT