EstimatedMeasurement.java
/* Copyright 2002-2024 CS GROUP
* Licensed to CS GROUP (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.estimation.measurements;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.stream.Stream;
import org.orekit.errors.OrekitIllegalArgumentException;
import org.orekit.errors.OrekitIllegalStateException;
import org.orekit.errors.OrekitMessages;
import org.orekit.propagation.SpacecraftState;
import org.orekit.time.AbsoluteDate;
import org.orekit.utils.ParameterDriver;
import org.orekit.utils.TimeSpanMap;
import org.orekit.utils.TimeStampedPVCoordinates;
import org.orekit.utils.TimeSpanMap.Span;
/** Class holding an estimated theoretical value associated to an {@link ObservedMeasurement observed measurement}.
* @param <T> the type of the measurement
* @author Luc Maisonobe
* @since 8.0
*/
public class EstimatedMeasurement<T extends ObservedMeasurement<T>> extends EstimatedMeasurementBase<T> {
/** Partial derivatives with respect to states. */
private double[][][] stateDerivatives;
/** Partial derivatives with respect to parameters. */
private final Map<ParameterDriver, TimeSpanMap<double[]>> parametersDerivatives;
/** Simple constructor.
* @param observedMeasurement associated observed measurement
* @param iteration iteration number
* @param count evaluations counter
* @param states states of the spacecrafts
* @param participants coordinates of the participants in signal travel order
* in inertial frame
*/
public EstimatedMeasurement(final T observedMeasurement,
final int iteration, final int count,
final SpacecraftState[] states,
final TimeStampedPVCoordinates[] participants) {
super(observedMeasurement, iteration, count, states, participants);
this.stateDerivatives = new double[states.length][][];
this.parametersDerivatives = new IdentityHashMap<ParameterDriver, TimeSpanMap<double[]>>();
}
/** Get state size.
* <p>
* Warning, the {@link #setStateDerivatives(int, double[][])}
* method must have been called before this method is called.
* </p>
* @return state size
* @since 10.1
*/
public int getStateSize() {
return stateDerivatives[0][0].length;
}
/** Get the partial derivatives of the {@link #getEstimatedValue()
* simulated measurement} with respect to state Cartesian coordinates.
* @param index index of the state, according to the {@code states}
* passed at construction
* @return partial derivatives of the simulated value (array of size
* {@link ObservedMeasurement#getDimension() dimension} x 6)
*/
public double[][] getStateDerivatives(final int index) {
final double[][] sd = new double[getObservedMeasurement().getDimension()][];
for (int i = 0; i < getObservedMeasurement().getDimension(); ++i) {
sd[i] = stateDerivatives[index][i].clone();
}
return sd;
}
/** Set the partial derivatives of the {@link #getEstimatedValue()
* simulated measurement} with respect to state Cartesian coordinates.
* @param index index of the state, according to the {@code states}
* passed at construction
* @param derivatives partial derivatives with respect to state
*/
public void setStateDerivatives(final int index, final double[]... derivatives) {
this.stateDerivatives[index] = new double[getObservedMeasurement().getDimension()][];
for (int i = 0; i < getObservedMeasurement().getDimension(); ++i) {
this.stateDerivatives[index][i] = derivatives[i].clone();
}
}
/** Get all the drivers with set derivatives.
* @return all the drivers with set derivatives
* @since 9.0
*/
public Stream<ParameterDriver> getDerivativesDrivers() {
return parametersDerivatives.entrySet().stream().map(entry -> entry.getKey());
}
/** Get the partial derivatives of the {@link #getEstimatedValue()
* simulated measurement} with respect to a parameter.
* @param driver name of the span of the driver for the parameter for which
* the derivative wants to be known.
* @return partial derivatives of the simulated value
* @exception OrekitIllegalArgumentException if parameter is unknown or
* OrekitIllegalStateException if this function is used on a PDriver having several
* values driven, in this case the method
* {@link #getParameterDerivatives(ParameterDriver, AbsoluteDate)} must be called
*/
public double[] getParameterDerivatives(final ParameterDriver driver)
throws OrekitIllegalArgumentException {
if (driver.getNbOfValues() == 1) {
final TimeSpanMap<double[]> p = parametersDerivatives.get(driver);
if (p == null) {
final StringBuilder builder = new StringBuilder();
for (final Map.Entry<ParameterDriver, TimeSpanMap<double[]>> entry : parametersDerivatives.entrySet()) {
if (builder.length() > 0) {
builder.append(", ");
}
builder.append(entry.getKey());
}
throw new OrekitIllegalArgumentException(OrekitMessages.UNSUPPORTED_PARAMETER_NAME,
driver,
builder.length() > 0 ? builder.toString() : " <none>");
}
return p.get(AbsoluteDate.ARBITRARY_EPOCH);
} else {
throw new OrekitIllegalStateException(OrekitMessages.PARAMETER_WITH_SEVERAL_ESTIMATED_VALUES, driver.getName(), "getParameterDerivatives(driver, date)");
}
}
/** Get the partial derivatives of the {@link #getEstimatedValue()
* simulated measurement} with respect to a parameter.
* @param driver name of the span of the driver for the parameter for which
* the derivative wants to be known.
* @param date date at which the parameter derivatives wants to be known
* @return partial derivatives of the simulated value
* @exception OrekitIllegalArgumentException if parameter is unknown
*/
public double[] getParameterDerivatives(final ParameterDriver driver, final AbsoluteDate date)
throws OrekitIllegalArgumentException {
final TimeSpanMap<double[]> p = parametersDerivatives.get(driver);
if (p == null) {
final StringBuilder builder = new StringBuilder();
for (final Map.Entry<ParameterDriver, TimeSpanMap<double[]>> entry : parametersDerivatives.entrySet()) {
if (builder.length() > 0) {
builder.append(", ");
}
builder.append(entry.getKey());
}
throw new OrekitIllegalArgumentException(OrekitMessages.UNSUPPORTED_PARAMETER_NAME,
driver,
builder.length() > 0 ? builder.toString() : "<none>");
}
return p.get(date);
}
/** Set the partial derivatives of the {@link #getEstimatedValue()
* simulated measurement} with respect to parameter.
* @param driver name of the span of the driver for the parameter for which
* the derivative wants to be known.
* @param date date at which the parameterDerivative wants to be set
* @param parameterDerivatives partial derivatives with respect to parameter
*/
public void setParameterDerivatives(final ParameterDriver driver, final AbsoluteDate date, final double... parameterDerivatives) {
if (!parametersDerivatives.containsKey(driver) || parametersDerivatives.get(driver) == null) {
final TimeSpanMap<double[]> derivativeSpanMap = new TimeSpanMap<double[]>(parameterDerivatives);
final TimeSpanMap<String> driverNameSpan = driver.getNamesSpanMap();
for (Span<String> span = driverNameSpan.getSpan(driverNameSpan.getFirstSpan().getEnd()); span != null; span = span.next()) {
derivativeSpanMap.addValidAfter(parameterDerivatives, span.getStart(), false);
}
parametersDerivatives.put(driver, derivativeSpanMap);
} else {
AbsoluteDate dateToAddAfter = driver.getNamesSpanMap().getSpan(date).getStart();
if (dateToAddAfter.equals(AbsoluteDate.PAST_INFINITY)) {
dateToAddAfter = driver.getNamesSpanMap().getSpan(date).getEnd();
parametersDerivatives.get(driver).addValidBefore(parameterDerivatives, dateToAddAfter, false);
} else {
parametersDerivatives.get(driver).addValidAfter(parameterDerivatives, dateToAddAfter, false);
}
}
}
/** Set the partial derivatives of the {@link #getEstimatedValue()
* simulated measurement} with respect to parameter.
* @param driver driver for the parameter
* @param parameterDerivativesMap partial derivatives with respect to parameter
*/
public void setParameterDerivatives(final ParameterDriver driver, final TimeSpanMap<double[]> parameterDerivativesMap) {
parametersDerivatives.put(driver, parameterDerivativesMap);
}
}