j2000_to_sc

gdt.missions.fermi.gbm.localization.dol.legacy_functions.j2000_to_sc(scx, scy, scz, pos)[source]

Convert from j2000 position to space craft azimuth and zenith.

NOTE: Based on sc direction cosines derived from quaternion, and a given j2000 position(x,y,z), return azimuth and zenith angle in sc frame.

Parameters:

  • scx (np.ndarray(3, float64)) – Space craft X direction cosines

  • scy (np.ndarray(3, float64)) – Space craft Y direction cosines

  • scz (np.ndarray(3, float64)) – Space craft Z direction cosines

  • pos (np.ndarray(3, float32)) – J2000 position in cartesian (x,y,z)

Returns:

  • az (float32) – Azimuth angle in radians

  • zen (float32) – Zenith angle in radians