PreCompensation.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.leastsquares;
import org.orekit.estimation.measurements.EstimatedMeasurement;
import org.orekit.estimation.measurements.ObservedMeasurement;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.TimeStamped;
/** Class holding compensation of time offset for measurements.
* @author Luc Maisonobe
* @since 8.1
*/
class PreCompensation implements TimeStamped {
/** Underlying measurement. */
private final ObservedMeasurement<?> observed;
/** State pick-up dates, including pre-compensation. */
private final AbsoluteDate precompensated;
/** Simple constructor.
* @param observed underlying measurement
* @param previousEstimation previous estimation of the measurement (may be null)
*/
PreCompensation(final ObservedMeasurement<?> observed,
final EstimatedMeasurement<?> previousEstimation) {
this.observed = observed;
if (previousEstimation == null) {
// no previous estimate of transit time, we will pickup state at observed measurement date
precompensated = observed.getDate();
} else {
// pre-compensate signal transit time
precompensated = observed.getDate().shiftedBy(-previousEstimation.getTimeOffset());
}
}
/** Get the observed measurement.
* @return observed measurement
*/
public ObservedMeasurement<?> getMeasurement() {
return observed;
}
/** Get the state date, i.e. the measurement date pre-compensated
* by time offset.
* @return pre-compensated state date
*/
public AbsoluteDate getDate() {
return precompensated;
}
}