UnresolvedCenterFinding.simple_phase_correction

giant.relative_opnav.estimators.unresolved:

UnresolvedCenterFinding.simple_phase_correction(target_ind, target, line_of_sight_sun_image, temperature)

This method computes the simple phase correction assuming the target is a sphere.

First, the apparent diameter of the target in pixels is computed using SceneObject.get_apparent_diameter(). Then the phase angle is computed using meth:.Scene.phase_angle for the target. Finally, the correction magnitude is computed assuming a McEwen like scattering law. The magnitude is then multiplied by the sun direction vector to compute the phase correction.

This is based on the technique in https://www.aanda.org/articles/aa/pdf/2004/10/aah4644.pdf

Parameters:

  • target_ind (int) – the index of the target in the Scene.target_objs list

  • target (SceneObject) – The target object itself to compute the phase correction for

  • line_of_sight_sun_image (ndarray) – The unit vector from the sun to the target in the image

  • temperature (Real) – the temperature of the camera when the image was captured

Returns:

The phase correction as a length 2 numpy array from the center of brightness to the center of figure

Return type:

ndarray