Struct RangeDoppler

pub struct RangeDoppler {
    pub epoch: Epoch,
    pub obs: Vector2<f64>,
}

A simultaneous range and Doppler measurement in units of km and km/s, available both in one way and two way measurement.

Fields

epoch: Epoch

Epoch of the observation

obs: Vector2<f64>

Observation vector in km and km/s

Implementations

impl RangeDoppler

pub fn one_way( aer: AzElRange, timestamp_noise_s: f64, range_noise_km: f64, doppler_noise_km_s: f64, ) -> Self

Initialize a new one-way range and Doppler measurement from the provided states and the effective noises.

Panics

• If the epochs of the two states differ.
• If the frames of the two states differ.

pub fn two_way( aer_t0: AzElRange, aer_t1: AzElRange, timestamp_noise_s: f64, range_noise_km: f64, doppler_noise_km_s: f64, ) -> Self

Initialize a new two-way range and Doppler measurement from the provided states as times t_1 and t_2 and the effective noises.

The measurement is time-tagged at realization, i.e. at the end of the integration time (plus timestamp noise).

Noise

The measurements are not considered to be independent distributed variables. As such, the noises are reduced by a factor of sqrt(2).

Panics

• If the epochs of the two states differ.
• If the frames of the two states differ.
• If both epochs are identical.

Trait Implementations

impl Clone for RangeDoppler

fn clone(&self) -> RangeDoppler

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RangeDoppler

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl EstimateFrom<Spacecraft, RangeDoppler> for Spacecraft

fn extract(from: Spacecraft) -> Self

From the state extract the state to be estimated

fn sensitivity( msr: &RangeDoppler, receiver: Self, transmitter: Orbit, ) -> OMatrix<f64, <RangeDoppler as Measurement>::MeasurementSize, Self::Size>

where DefaultAllocator: Allocator<<RangeDoppler as Measurement>::MeasurementSize, Self::Size>,

Returns the measurement sensitivity (often referred to as H tilde).

impl Measurement for RangeDoppler

fn observation(&self) -> Vector2<f64>

Returns this measurement as a vector of Range and Range Rate

Units: km, km/s

type MeasurementSize = Const<2>

Defines how much data is measured. For example, if measuring range and range rate, this should be of size 2 (nalgebra::U2).

fn fields() -> Vec<Field>

Returns the fields for this kind of measurement. The metadata must include a unit field with the unit.

fn from_observation( epoch: Epoch, obs: OVector<f64, Self::MeasurementSize>, ) -> Self

Initializes a new measurement from the provided data.

impl PartialEq for RangeDoppler

fn eq(&self, other: &RangeDoppler) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TimeTagged for RangeDoppler

fn epoch(&self) -> Epoch

Retrieve the Epoch

fn set_epoch(&mut self, epoch: Epoch)

Set the Epoch

impl TrackingDeviceSim<Spacecraft, RangeDoppler> for GroundStation

fn measure( &mut self, epoch: Epoch, traj: &Traj<Spacecraft>, rng: Option<&mut Pcg64Mcg>, almanac: Arc<Almanac>, ) -> Result<Option<RangeDoppler>, ODError>

Perform a measurement from the ground station to the receiver (rx).

fn measurement_covar( &mut self, epoch: Epoch, ) -> Result<OMatrix<f64, <RangeDoppler as Measurement>::MeasurementSize, <RangeDoppler as Measurement>::MeasurementSize>, ODError>

Returns the measurement noise of this ground station.

Methodology

Noises are modeled using a StochasticNoise process, defined by the sigma on the turn-on bias and on the steady state noise. The measurement noise is computed assuming that all measurements are independent variables, i.e. the measurement matrix is a diagonal matrix. The first item in the diagonal is the range noise (in km), set to the square of the steady state sigma. The second item is the Doppler noise (in km/s), set to the square of the steady state sigma of that Gauss Markov process.

fn name(&self) -> String

Returns the name of this tracking data simulator

fn location( &self, epoch: Epoch, frame: Frame, almanac: Arc<Almanac>, ) -> AlmanacResult<Orbit>

Returns the device location at the given epoch and in the given frame.

fn measure_instantaneous( &mut self, rx: Spacecraft, rng: Option<&mut Pcg64Mcg>, almanac: Arc<Almanac>, ) -> Result<Option<RangeDoppler>, ODError>

impl Copy for RangeDoppler

impl StructuralPartialEq for RangeDoppler