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/* Nyx, blazing fast astrodynamics Copyright (C) 2021 Christopher Rabotin <christopher.rabotin@gmail.com> This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ use crate::celestia::{Frame, Orbit}; use crate::dimensions::Vector3; pub use super::thrustctrl::Mnvr; /// The `DeltaVctrl` trait handles control laws, optimizations, and other such methods for /// controlling the change in velocity of a point mass during a mission arc (`MissionArc`). pub trait DeltaVctrl where Self: Clone + Sized, { /// Returns the control vector corresponding to the change in velocity direction in the inertial frame. fn ctrl_vector(&self, state: &Orbit) -> Vector3<f64>; /// Prepares the controller for the next maneuver (called from set_state of the dynamics). fn next(&mut self, state: &Orbit); } #[derive(Clone, Debug)] pub struct ImpulsiveBurns { /// Maneuvers should be provided in chronological order, first maneuver first in the list pub mnvrs: Vec<Mnvr>, pub mnvr_no: usize, } impl ImpulsiveBurns { /// Builds a schedule from the vector of maneuvers, must be provided in chronological order. pub fn from_mnvrs(mnvrs: Vec<Mnvr>) -> Self { Self { mnvrs, mnvr_no: 0 } } } impl DeltaVctrl for ImpulsiveBurns { fn ctrl_vector(&self, state: &Orbit) -> Vector3<f64> { if self.mnvr_no >= self.mnvrs.len() { Vector3::zeros() } else { let next_mnvr = self.mnvrs[self.mnvr_no]; if next_mnvr.start <= state.dt && next_mnvr.end >= state.dt { state.dcm_from_traj_frame(Frame::VNC).unwrap() * next_mnvr.vector } else { Vector3::zeros() } } } fn next(&mut self, state: &Orbit) { if self.mnvr_no < self.mnvrs.len() { let cur_mnvr = self.mnvrs[self.mnvr_no]; if state.dt >= cur_mnvr.end { self.mnvr_no += 1; } } } }