melvin_ob::flight_control::orbit::burn_sequence

Struct BurnSequenceEvaluator

Source 
pub struct BurnSequenceEvaluator<'a> {
    i: IndexedOrbitPosition,
    vel: Vec2D<I32F32>,
    targets: &'a [(Vec2D<I32F32>, Vec2D<I32F32>)],
    max_dt: usize,
    min_dt: usize,
    max_off_orbit_dt: usize,
    max_angle_dev: I32F32,
    turns: (Vec<(Vec2D<I32F32>, Vec2D<I32F32>)>, Vec<(Vec2D<I32F32>, Vec2D<I32F32>)>),
    best_burn: Option<ExitBurnResult>,
    fuel_left: I32F32,
    dynamic_fuel_w: I32F32,
    target_id: usize,
}
Expand description

A struct responsible for evaluating potential burn sequences for an orbit.

BurnSequenceEvaluator processes orbital positions, velocities, and target data to determine optimal burn sequences based on constraints such as time, fuel, and battery consumption.

Fields§

§i: IndexedOrbitPosition

The current indexed orbital position.

§vel: Vec2D<I32F32>

The current velocity vector in 2D space.

§targets: &'a [(Vec2D<I32F32>, Vec2D<I32F32>)]

A slice of target positions and their secondary offsets.

§max_dt: usize

The maximum allowable delta time for a burn sequence.

§min_dt: usize

The minimum allowable delta time for a burn sequence.

§max_off_orbit_dt: usize

The maximum allowable time spent off-orbit during a sequence.

§max_angle_dev: I32F32

The maximum angular deviation for the burn sequence.

§turns: (Vec<(Vec2D<I32F32>, Vec2D<I32F32>)>, Vec<(Vec2D<I32F32>, Vec2D<I32F32>)>)

Precomputed tuples of clockwise and counterclockwise turns for the sequence.

§best_burn: Option<ExitBurnResult>

The current best computed burn result, if one exists.

§fuel_left: I32F32

The available fuel for the evaluator to use.

§dynamic_fuel_w: I32F32

The dynamic weight assigned to fuel usage during scoring.

§target_id: usize

The identifier for the current target being evaluated.

Implementations§

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impl<'a> BurnSequenceEvaluator<'a>

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const NINETY_DEG: I32F32

A constant representing a 90-degree angle, in fixed-point format.

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const OFF_ORBIT_W: I32F32

Weight assigned to off-orbit delta time in optimization calculations.

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const MAX_FUEL_W: I32F32

Maximum Weight assigned to fuel consumption in optimization calculations.

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const MIN_FUEL_W: I32F32

Minimum Weight assigned to fuel consumption in optimization calculations.

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const ANGLE_DEV_W: I32F32

Weight assigned to angle deviation in optimization calculations.

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const ADD_ANGLE_DEV_W: I32F32

Weight assigned to additional target angle deviation.

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pub fn new( i: IndexedOrbitPosition, vel: Vec2D<I32F32>, targets: &'a [(Vec2D<I32F32>, Vec2D<I32F32>)], min_dt: usize, max_dt: usize, max_off_orbit_dt: usize, turns: (Vec<(Vec2D<I32F32>, Vec2D<I32F32>)>, Vec<(Vec2D<I32F32>, Vec2D<I32F32>)>), fuel_left: I32F32, target_id: usize, ) -> Self

Constructs a new BurnSequenceEvaluator object

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pub fn process_dt(&mut self, dt: usize, max_needed_batt: I32F32)

Evaluates whether a burn sequence at a specific dt is viable and better than existing sequences.

§Arguments
  • dt: Time offset in seconds from current position.
  • max_needed_batt: Upper bound for acceptable battery consumption.
§Behavior

Builds and scores a candidate burn. Updates best_burn if it’s better and satisfies fuel/charge constraints.

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pub fn get_unwrapped_target( b: &BurnSequence, tar: &Vec2D<I32F32>, ) -> Vec2D<I32F32>

Returns the unwrapped target position

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pub fn get_best_burn(self) -> Option<ExitBurnResult>

Returns the (heuristically) optimal ExitBurnResult if present

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fn build_burn_sequence( &self, burn_i: IndexedOrbitPosition, turns_in_dir: &[(Vec2D<I32F32>, Vec2D<I32F32>)], break_cond: bool, best_target: &(Vec2D<I32F32>, Vec2D<I32F32>), ) -> Option<BurnSequence>

Attempts to build a complete burn sequence using directional turns and evaluating if the final orientation and arrival meet objective constraints.

§Arguments
  • burn_i: Starting orbit index for this sequence.
  • turns_in_dir: Precomputed valid turn maneuvers in chosen direction.
  • break_cond: Whether to break based on clockwise/anticlockwise matching.
  • best_target: Target location and secondary offset.
§Returns

A viable BurnSequence if one exists, otherwise None.

Source

fn get_add_target_cost( bs: &BurnSequence, target: &(Vec2D<I32F32>, Vec2D<I32F32>), ) -> I32F32

Calculates the additional cost for a secondary target

§Arguments

bs: corresponding burn sequence target: A tuple of the primary and secondary target position

§Returns

I32F32 additional target cost factor

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fn get_bs_cost(&self, bs: &BurnSequence) -> I32F32

Calculates the normalized cost factor for a burn sequence

§Arguments
  • bs: the burn sequence to be evaluated
§Returns

The I32F32-cost factor.

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