Observation.java
/* Copyright 2002-2022 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
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*/
package org.orekit.files.ccsds.ndm.tdm;
import org.orekit.time.AbsoluteDate;
/** The Observation class contains the data from an observation line.
* <p>
* It is not an Orekit object yet. It is a simple container holding:
* </p>
* <ul>
* <li>a keyword, the type of the observation;</li>
* <li>a timetag, the epoch of the observation;</li>
* <li>a measurement, the value of the observation.</li>
* </ul>
* <p>
* WARNING. The same class handles many different measurements
* types (range, Doppler, clocks, pressure, power to noise ratio…).
* Since Orekit 11.0, it uses only SI units, so angular measurements
* have already been converted in radians, range has been converted
* in meters (according to the {@link TdmMetadata#getRangeUnits()
* range units}, Doppler has been converted to meters per second.
* Up to Orekit 10.x, the measurements were raw measurements as read
* in the TDM.
* </p>
* @author Maxime Journot
*/
public class Observation {
/** Type of the observation. */
private final ObservationType type;
/** Epoch: the timetag of the observation. */
private final AbsoluteDate epoch;
/** Measurement: the value of the observation. */
private final double measurement;
/** Simple constructor.
* @param type type of the observation
* @param epoch the timetag
* @param measurement the measurement (in SI units, converted from TDM)
*/
public Observation(final ObservationType type, final AbsoluteDate epoch, final double measurement) {
this.type = type;
this.epoch = epoch;
this.measurement = measurement;
}
/** Get the type of observation.
* @return type of observation
*/
public ObservationType getType() {
return type;
}
/** Getter for the epoch.
* @return the epoch
*/
public AbsoluteDate getEpoch() {
return epoch;
}
/** Getter for the measurement.
* @return the measurement (in SI units, converted from TDM)
*/
public double getMeasurement() {
return measurement;
}
}