cheta.comps.Comp_Pitch_Roll_OBC_Safe#

class cheta.comps.Comp_Pitch_Roll_OBC_Safe(unit_system='eng')#

Bases: cheta.comps.computed_msid.ComputedMsid

Computed MSID to return pitch or off-nominal roll angle which is valid in NPNT, NMAN, NSUN, and Safe Mode.

MSID names are pitch_comp and roll_comp.

The computation logic is shown below:

On OBC control (CONLOFP == "NRML"):
  - AOPCADMD in ["NPNT", "NMAN"] => compute pitch/roll from AOATTQT[1234]
    (MAUDE or CXC) and predictive ephemeris ORBITEPHEM0_[XYZ] and
    SOLAREPHEM0_[XYZ] (CXC only but always available)
  - AOPCADMD == "NSUN" => get pitch/roll from PITCH/ROLL_CSS derived params.
    These are also in MAUDE.

On CPE control (CONLOFP == "SAFE"):
  - Compute pitch/roll from 6SUNSA[123] + 6SARES[12] via calc_pitch/roll_css_safe()

Intervals for other CONLOFP values are ignored.
msid_match = '(roll|pitch)_comp'#
get_msid_attrs(tstart, tstop, msid, msid_args)#

Get attributes for computed MSID: vals, bads, times, unit, raw_vals, and offset. The first four must always be provided.

Parameters:

  • tstart – start time (CXC secs)

  • tstop – stop time (CXC secs)

  • msid – full MSID name e.g. tephin_plus_5

  • msid_args – tuple of regex match groups (msid_name,)

Returns:

dict of MSID attributes