Beyond
======
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This library was started to better understand how Flight Dynamics works. It
has no intent of efficiency nor performance at the moment, and the goal is
mainly to develop a simple API for space observations.
The sources of this library can be found at `github <https://github.com/galactics/beyond>`__ and
are under the MIT license.
Installation
------------
Beyond requires Python 3.6+, numpy and `sgp4 <https://github.com/brandon-rhodes/python-sgp4>`__.
To install the library and its dependencies use pip
.. code-block:: shell
pip install beyond
Documentation
-------------
* `Last release <http://beyond.readthedocs.io/en/stable/>`__ (stable)
* `Dev <http://beyond.readthedocs.io/en/latest/>`__ (latest)
Usage
-----
.. code-block:: python
import numpy as np
from beyond.io.tle import Tle
from beyond.frames import create_station
from beyond.dates import Date, timedelta
# Parse TLE
tle = Tle("""ISS (ZARYA)
1 25544U 98067A 19072.15347313 .00000167 00000-0 10147-4 0 9997
2 25544 51.6420 118.6717 0004098 99.2855 123.2259 15.52799885160336""")
# Create a station from which to compute the pass
station = create_station('KSC', (28.524058, -80.65085, 0.0))
for orb in station.visibility(tle.orbit(), start=Date.now(), stop=timedelta(days=1), step=timedelta(minutes=2), events=True):
# As all angles are given in radians,
# there is some conversion to do
azim = -np.degrees(orb.theta) % 360
elev = np.degrees(orb.phi)
r = orb.r / 1000.
print("{event:10} {tle.name} {date:%Y-%m-%dT%H:%M:%S.%f} {azim:7.2f} {elev:7.2f} {r:10.2f}".format(
date=orb.date, r=r, azim=azim, elev=elev,
tle=tle, event=orb.event if orb.event is not None else ""
))
# Stop at the end of the first pass
if orb.event and orb.event.info == "LOS":
break
This library is used as basis for the `Space-Command <https://github.com/galactics/space-command>`__ utility.
Commons usages for this library are:
* `Predicting of satellite visibility <http://beyond.readthedocs.io/en/stable//examples.html#station-pointings>`__
* `Computing satellite ground track <http://beyond.readthedocs.io/en/stable//examples.html#ground-track>`__
* `Computing planets visibility <http://beyond.readthedocs.io/en/stable//examples.html#jupiter-and-its-moons>`__
References
----------
A lot of the formulas and flight dynamic algorithm are based on Vallado's
*Fundamentals of Astrodynamic and Applications* 4th ed.
