Satellite State Representation
- class satkit.satstate(time: satstate.__init__.time, pos: numpy.typing.ArrayLike[numpy.float64], vel: numpy.typing.ArrayLike[numpy.float64], cov: numpy.typing.ArrayLike[numpy.float64] | None = None)
A convenience class representing a satellite position and velocity, and optionally 6x6 position/velocity covariance at a particular instant in time
This class can be used to propagate the position, velocity, and optional covariance to different points in time.
- property cov
6x6 state covariance matrix in GCRF frame
- Returns:
6x6 numpy array representing state covariance in GCRF frame or None if not set
- Return type:
npt.ArrayLike[np.float64] | None
- property pos_gcrf
state position in meters in GCRF frame
- Returns:
3-element numpy array representing position in meters in GCRF frame
- Return type:
npt.ArrayLike[np.float64]
- propagate(time: satstate.propagate.time | duration, propsettings=None)
Propagate this state to a new time, specified by the “time” input, updating the position, the velocity, and the covariance if set
- Parameters:
time (satkit.time|satkit.duration) – Time or duration from current time to which to propagate the state
- Keyword Arguments:
propsettings – satkit.propsettings object describing settings to use in the propagation. If omitted, default is used
- Returns:
New satellite state object representing the state at the new time
- Return type:
- property qgcrf2lvlh
Quaternion that rotates from the GCRF to the LVLH frame for the current state
- Returns:
Quaternion that rotates from the GCRF to the LVLH frame for the current state
- Return type:
- property time
Return time of this satellite state
- Returns:
Time instant of this state
- Return type:
- property vel_gcrf
Return this state velocity in meters / second in GCRF
- Returns:
3-element numpy array representing velocity in meters / second in GCRF frame
- Return type:
npt.ArrayLike[np.float64]