Comparable<Range>
, ComparableMeasurement
, ObservedMeasurement<Range>
, TimeStamped
public class Range extends AbstractMeasurement<Range>
For one-way measurements, a signal is emitted by the satellite and received by the ground station. The measurement value is the elapsed time between emission and reception multiplied by c where c is the speed of light.
For two-way measurements, the measurement is considered to be a signal emitted from a ground station, reflected on spacecraft, and received on the same ground station. Its value is the elapsed time between emission and reception multiplied by c/2 where c is the speed of light.
The motion of both the station and the spacecraft during the signal flight time are taken into account. The date of the measurement corresponds to the reception on ground of the emitted or reflected signal.
The clock offsets of both the ground station and the satellite are taken into account. These offsets correspond to the values that must be subtracted from station (resp. satellite) reading of time to compute the real physical date. These offsets have two effects:
Constructor | Description |
---|---|
Range(GroundStation station,
boolean twoWay,
AbsoluteDate date,
double range,
double sigma,
double baseWeight,
int propagatorIndex) |
Deprecated.
as of 9.3, replaced by
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite) |
Range(GroundStation station,
boolean twoWay,
AbsoluteDate date,
double range,
double sigma,
double baseWeight,
ObservableSatellite satellite) |
Simple constructor.
|
Range(GroundStation station,
AbsoluteDate date,
double range,
double sigma,
double baseWeight) |
Deprecated.
as of 9.3, replaced by
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite) |
Range(GroundStation station,
AbsoluteDate date,
double range,
double sigma,
double baseWeight,
boolean twoWay) |
Deprecated.
as of 9.3, replaced by
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite) |
Range(GroundStation station,
AbsoluteDate date,
double range,
double sigma,
double baseWeight,
int propagatorIndex) |
Deprecated.
as of 9.3, replaced by
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite) |
Modifier and Type | Method | Description |
---|---|---|
GroundStation |
getStation() |
Get the ground station from which measurement is performed.
|
boolean |
isTwoWay() |
Check if the instance represents a two-way measurement.
|
protected EstimatedMeasurement<Range> |
theoreticalEvaluation(int iteration,
int evaluation,
SpacecraftState[] states) |
Estimate the theoretical value.
|
addModifier, addParameterDriver, estimate, getBaseWeight, getCoordinates, getDate, getDimension, getModifiers, getObservedValue, getParametersDrivers, getPropagatorsIndices, getSatellites, getTheoreticalStandardDeviation, isEnabled, setEnabled, signalTimeOfFlight, signalTimeOfFlight
compareTo
@Deprecated public Range(GroundStation station, AbsoluteDate date, double range, double sigma, double baseWeight)
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite)
This constructor uses 0 as the index of the propagator related to this measurement, thus being well suited for mono-satellite orbit determination.
station
- ground station from which measurement is performeddate
- date of the measurementrange
- observed valuesigma
- theoretical standard deviationbaseWeight
- base weight@Deprecated public Range(GroundStation station, AbsoluteDate date, double range, double sigma, double baseWeight, boolean twoWay)
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite)
This constructor uses 0 as the index of the propagator related to this measurement, thus being well suited for mono-satellite orbit determination.
station
- ground station from which measurement is performeddate
- date of the measurementrange
- observed valuesigma
- theoretical standard deviationbaseWeight
- base weighttwoWay
- flag indicating whether it is a two-way measurement@Deprecated public Range(GroundStation station, AbsoluteDate date, double range, double sigma, double baseWeight, int propagatorIndex)
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite)
station
- ground station from which measurement is performeddate
- date of the measurementrange
- observed valuesigma
- theoretical standard deviationbaseWeight
- base weightpropagatorIndex
- index of the propagator related to this measurement@Deprecated public Range(GroundStation station, boolean twoWay, AbsoluteDate date, double range, double sigma, double baseWeight, int propagatorIndex)
Range(GroundStation, boolean, AbsoluteDate,
double, double, double, ObservableSatellite)
station
- ground station from which measurement is performedtwoWay
- flag indicating whether it is a two-way measurementdate
- date of the measurementrange
- observed valuesigma
- theoretical standard deviationbaseWeight
- base weightpropagatorIndex
- index of the propagator related to this measurementpublic Range(GroundStation station, boolean twoWay, AbsoluteDate date, double range, double sigma, double baseWeight, ObservableSatellite satellite)
station
- ground station from which measurement is performedtwoWay
- flag indicating whether it is a two-way measurementdate
- date of the measurementrange
- observed valuesigma
- theoretical standard deviationbaseWeight
- base weightsatellite
- satellite related to this measurementpublic GroundStation getStation()
public boolean isTwoWay()
protected EstimatedMeasurement<Range> theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states)
The theoretical value does not have any modifiers applied.
theoreticalEvaluation
in class AbstractMeasurement<Range>
iteration
- iteration numberevaluation
- evaluation numberstates
- orbital states at measurement dateAbstractMeasurement.estimate(int, int, SpacecraftState[])
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