Source code for RCAIDE.Library.Mission.Common.Initialize.time
# RCAIDE/Library/Missions/Common/Initialize/time.py
#
#
# Created: Jul 2023, M. Clarke
# ----------------------------------------------------------------------------------------------------------------------
# Initialize Time
# ----------------------------------------------------------------------------------------------------------------------
[docs]
def time(segment):
"""
Initializes time variables for mission segment analysis
Parameters
----------
segment : Segment
The mission segment being analyzed
Notes
-----
This function sets up the initial time values for both inertial and
planetary reference frames. It handles time continuity between segments
and establishes start times for new segments.
The function follows this priority for time initialization:
1. Previous segment final time (if initials exist)
2. Explicit segment start time (if specified)
3. Current initial time value
**Required Segment State Variables**
If segment.state.initials exists:
state.initials.conditions.frames:
inertial:
- time : array
Previous segment final time [s]
planet:
- start_time : float
Previous segment start time [s]
state.conditions.frames:
inertial:
- time : array
Current segment time array [s]
planet:
- start_time : float
Current segment start time [s]
**Optional Segment Parameters**
segment:
- start_time : float
Explicit segment start time [s]
**Major Assumptions**
* Continuous time tracking when using initials
* Valid time values (non-negative)
* Proper time synchronization between frames
* Time measured in seconds
Returns
-------
None
Updates segment conditions directly
See Also
--------
RCAIDE.Framework.Mission.Segments
RCAIDE.Library.Mission.Common.Initialize.planet_position
"""
if segment.state.initials:
t_initial = segment.state.initials.conditions.frames.inertial.time
t_current = segment.state.conditions.frames.inertial.time
segment.state.conditions.frames.inertial.time[:,:] = t_current + (t_initial[-1,0] - t_current[0,0])
else:
t_initial = segment.state.conditions.frames.inertial.time[0,0]
if segment.state.initials:
segment.state.conditions.frames.planet.start_time = segment.state.initials.conditions.frames.planet.start_time
elif 'start_time' in segment:
segment.state.conditions.frames.planet.start_time = segment.start_time
return
