org.orekit.estimation.measurements

Class FDOA

java.lang.Object

org.orekit.estimation.measurements.AbstractMeasurement<T>

org.orekit.estimation.measurements.GroundReceiverMeasurement<FDOA>

org.orekit.estimation.measurements.FDOA

All Implemented Interfaces:

Comparable<ComparableMeasurement>, ComparableMeasurement, ObservedMeasurement<FDOA>, TimeStamped, ParameterDriversProvider

public class FDOA
extends GroundReceiverMeasurement<FDOA>

表示一个以卫星为发射源，两个地面站为接收器的频率到达差测量的类。

FDOA测量了发射源和接收器之间信号到达频率的差异，对应于两个接收器到发射源的速度范围的差异。

测量的日期对应于主站接收信号的日期。该测量对应于测量日期主站接收到的信号频率减去第二个站接收到的信号频率：fdoa = f1 - f2

考虑了信号飞行时间内地面站和卫星的运动。

Since:

12.0

Author:

Mark Rutten

Field Summary

Fields

Modifier and Type	Field and Description
static String	MEASUREMENT_TYPE 测量类型。

Constructor Summary

Constructors

Constructor and Description
FDOA(GroundStation primeStation, GroundStation secondStation, double centreFrequency, AbsoluteDate date, double fdoa, double sigma, double baseWeight, ObservableSatellite satellite) 简单构造函数。

Method Summary

Modifier and Type	Method and Description
GroundStation	getPrimeStation() 获取主地面站，即给出测量日期的地面站。
GroundStation	getSecondStation() 获取第二个地面站，即给出测量的地面站。
protected EstimatedMeasurement<FDOA>	theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states) 估算理论值。
protected EstimatedMeasurementBase<FDOA>	theoreticalEvaluationWithoutDerivatives(int iteration, int evaluation, SpacecraftState[] states) 估算不带导数的理论值。

Methods inherited from class org.orekit.estimation.measurements.GroundReceiverMeasurement

computeCommonParametersWithDerivatives, computeCommonParametersWithout, getGroundStationCoordinates, getGroundStationPosition, getStation, isTwoWay

Methods inherited from class org.orekit.estimation.measurements.AbstractMeasurement

addModifier, addParameterDriver, estimate, estimateWithoutDerivatives, getBaseWeight, getCoordinates, getDate, getDimension, getModifiers, getObservedValue, getParametersDrivers, getSatellites, getTheoreticalStandardDeviation, isEnabled, setEnabled, signalTimeOfFlight, signalTimeOfFlight

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.orekit.estimation.measurements.ObservedMeasurement

getMeasurementType

Methods inherited from interface org.orekit.estimation.measurements.ComparableMeasurement

compareTo

Methods inherited from interface org.orekit.time.TimeStamped

durationFrom

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

getNbParametersDriversValue, getParameterDriver, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, isSupported

Field Detail

MEASUREMENT_TYPE

public static final String MEASUREMENT_TYPE

测量类型。

另请参阅:

常量字段数值

Constructor Detail

FDOA

public FDOA(GroundStation primeStation,
            GroundStation secondStation,
            double centreFrequency,
            AbsoluteDate date,
            double fdoa,
            double sigma,
            double baseWeight,
            ObservableSatellite satellite)

简单构造函数。

参数:

primeStation - 给出测量日期的地面站

secondStation - 给出测量的地面站

centreFrequency - 卫星发射源频率

date - 测量日期

fdoa - 观测值（s）

sigma - 理论标准偏差

baseWeight - 基本权重

satellite - 与此测量相关的卫星

Method Detail

getPrimeStation

public GroundStation getPrimeStation()

获取主地面站，即给出测量日期的地面站。

返回:

主地面站

getSecondStation

public GroundStation getSecondStation()

获取第二个地面站，即给出测量的地面站。

返回:

第二个地面站

theoreticalEvaluationWithoutDerivatives

protected EstimatedMeasurementBase<FDOA> theoreticalEvaluationWithoutDerivatives(int iteration,
                                                                                 int evaluation,
                                                                                 SpacecraftState[] states)

估算不带导数的理论值。

理论值没有应用任何修饰符。

指定者:

theoreticalEvaluationWithoutDerivatives 在类 AbstractMeasurement<FDOA>

参数:

iteration - 迭代次数

evaluation - 评估次数

states - 测量日期的轨道状态

返回:

理论值

另请参阅:

AbstractMeasurement.estimate(int, int, SpacecraftState[])

theoreticalEvaluation

protected EstimatedMeasurement<FDOA> theoreticalEvaluation(int iteration,
                                                           int evaluation,
                                                           SpacecraftState[] states)

估算理论值。

理论值没有应用任何修饰符。

指定者:

theoreticalEvaluation 在类 AbstractMeasurement<FDOA>

参数:

iteration - 迭代次数

evaluation - 评估次数

states - 测量日期的轨道状态

返回:

理论值

另请参阅:

AbstractMeasurement.estimate(int, int, SpacecraftState[])