def execute(self):
super(Program40, self).execute()
# if TIG < 2 mins away, abort burn
if utils.seconds_to_time(self.burn.time_until_ignition)["minutes"] < 2:
gc.remove_burn(gc.next_burn)
gc.poodoo_abort(226)
return
# if time to ignition if further than a hour away, display time to ignition
if utils.seconds_to_time(self.burn.time_until_ignition)["hours"] > 0:
utils.log("TIG > 1 hour away")
gc.execute_verb(verb="16", noun="33")
gc.main_loop_table.append(self._ten_minute_monitor)
else:
utils.log("TIG < 1 hour away, enabling burn")
self.burn.execute()
def recalculate_phase_angles(self):
""" This function is to be placed in the GC main loop to recalculate maneuver parameters.
:return: nothing
"""
# update current phase angle
telemachus_body_id = config.TELEMACHUS_BODY_IDS[config.OCTAL_BODY_NAMES[self.target_name]]
current_phase_angle = get_telemetry("body_phaseAngle",
body_number=telemachus_body_id)
# recalculate phase angle difference
phase_angle_difference = current_phase_angle - self.phase_angle_required
if phase_angle_difference < 0:
phase_angle_difference = 180 + abs(phase_angle_difference)
self.delta_time_to_burn = phase_angle_difference / ((360 / self.orbital_period) - (360 /
self.departure_body_orbital_period))
delta_time = utils.seconds_to_time(self.delta_time_to_burn)
velocity_at_cutoff = get_telemetry("orbitalVelocity") + self.delta_v_first_burn
def _ten_minute_monitor(self):
if utils.seconds_to_time(self.burn.time_until_ignition)["minutes"] < 10:
gc.main_loop_table.remove(self._ten_minute_monitor)
self.burn.execute()
def calculate_maneuver(self):
""" Calculates the maneuver parameters and creates a Burn object
:return: Nothing
"""
# load target
telemachus_target_id = config.TELEMACHUS_BODY_IDS[self.target_name]
target_apoapsis = float(get_telemetry("body_ApA", body_number=telemachus_target_id))
# set destination altitude
self.destination_altitude = target_apoapsis + 500000
# if target == "Mun":
# self.destination_altitude = 12750000
# obtain parameters to calculate burn
self.departure_altitude = get_telemetry("altitude")
self.orbital_period = get_telemetry("period")
self.departure_body_orbital_period = get_telemetry("body_period", body_number=config.TELEMACHUS_BODY_IDS[
"Kerbin"])
self.grav_param = get_telemetry("body_gravParameter", body_number=config.TELEMACHUS_BODY_IDS[
self.orbiting_body])
current_phase_angle = get_telemetry("body_phaseAngle", body_number=telemachus_target_id)
# calculate the first and second burn Δv parameters
self.delta_v_first_burn, gc.moi_burn_delta_v = hohmann_transfer.delta_v(self.departure_altitude,
self.destination_altitude)
print(gc.moi_burn_delta_v)
# calculate the time to complete the Hohmann transfer
self.time_to_transfer = hohmann_transfer.time_to_transfer(self.departure_altitude, self.destination_altitude,
self.grav_param)
# calculate the correct phase angle for the start of the burn
# note that the burn impulse is calculated as a instantaneous burn, to be correct the burn should be halfway
# complete at this calculated time
self.phase_angle_required = hohmann_transfer.phase_angle(self.departure_altitude, self.destination_altitude,
self.grav_param)
# calculate the current difference in phase angle required and current phase angle
self.phase_angle_difference = current_phase_angle - self.phase_angle_required
# if self.phase_angle_difference < 0:
# self.phase_angle_difference = 180 + abs(self.phase_angle_difference)
# calculate time of ignition (TIG)
self.delta_time_to_burn = self.phase_angle_difference / ((360 / self.orbital_period) -
(360 / self.departure_body_orbital_period))
# if the time of ignition is less than 120 seconds in the future, schedule the burn for next orbit
if self.delta_time_to_burn <= 120:
utils.log("Time of ignition less that 2 minutes in the future, starting burn during next orbit")
self.delta_time_to_burn += get_telemetry("period")
# convert the raw value in seconds to HMS
delta_time = utils.seconds_to_time(self.delta_time_to_burn)
# log the maneuver calculations
utils.log("P15 calculations:")
utils.log("Phase angle required: {}, Δv for burn: {} m/s, time to transfer: {}".format(
round(self.phase_angle_required, 2),
int(self.delta_v_first_burn),
utils.seconds_to_time(self.time_to_transfer)))
utils.log("Current Phase Angle: {}, difference: {}".format(
current_phase_angle,
self.phase_angle_difference))
utils.log("Time to burn: {} hours, {} minutes, {} seconds".format(
int(delta_time["hours"]),
int(delta_time["minutes"]),
delta_time["seconds"]))
# calculate the Δt from now of TIG for both burns
self.time_of_ignition_first_burn = get_telemetry("missionTime") + self.delta_time_to_burn
# create a Burn object for the outbound burn
self.first_burn = Burn(delta_v=self.delta_v_first_burn,
direction="prograde",
time_of_ignition=self.time_of_ignition_first_burn,
calling_program=self)
# load the Burn object into computer
gc.add_burn_to_queue(self.first_burn, execute=False)
# display burn parameters and go to poo
gc.execute_verb(verb="06", noun="95")
gc.go_to_poo()
