ADCS.CONOPS.goals.vector_goals.velocity_goal module

class ADCS.CONOPS.goals.vector_goals.velocity_goal.Velocity_Goal(boresight_name=None)

Bases: Vector_Goal

Velocity-direction vector goal.

This goal commands alignment with the instantaneous inertial velocity direction:

\[\hat{\mathbf{v}} = \frac{\mathbf{v}}{\|\mathbf{v}\|}, \qquad \mathbf{r}_{goal} = \hat{\mathbf{v}}.\]

A practical feed-forward reference angular velocity is provided using the dominant orbital angular rate (sufficient for most LEO ADCS applications):

\[\boldsymbol{\omega}_{ref} \approx \frac{\mathbf{r}\times\mathbf{v}}{\|\mathbf{r}\|^2}.\]

Parameters:

boresight_name (str | None)

to_ref(os0)

Generate a reference inertial direction and angular velocity.

Subclasses must implement this method to compute a desired inertial reference vector

\[\mathbf{v}_{\mathrm{ref}} \in \mathbb{R}^3\]

based on the current orbital state. The returned vector is expected to be nonzero and will typically be normalized by the downstream error computation.

Parameters:

os0 (Orbital_State) – Current orbital state.

Returns:

Reference inertial direction and reference angular velocity.

Return type:

Tuple[numpy.ndarray, numpy.ndarray]