ElevationFilter.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.filtering;
- import org.orekit.estimation.measurements.GroundStation;
- import org.orekit.estimation.measurements.ObservedMeasurement;
- import org.orekit.propagation.SpacecraftState;
- /**
- * Elevation pre-processing filter.
- * @param <T> the type of the measurement
- * @author Bryan Cazabonne
- * @author David Soulard
- * @since 10.2
- */
- public class ElevationFilter<T extends ObservedMeasurement<T>> implements MeasurementFilter<T> {
- /** Elevation threshold under which the measurement will be rejected [rad]. */
- private final double threshold;
- /** Ground station considered. */
- private final GroundStation station;
- /**
- * Constructor.
- * @param station considered by the filter
- * @param threshold minimum elevation for a measurements to be accepted, in radians
- */
- public ElevationFilter(final GroundStation station, final double threshold) {
- this.station = station;
- this.threshold = threshold;
- }
- /** {@inheritDoc} */
- @Override
- public void filter(final ObservedMeasurement<T> measurement, final SpacecraftState state) {
- // Current elevation of the satellite
- final double trueElevation = station.getBaseFrame().
- getTrackingCoordinates(state.getPosition(), state.getFrame(), state.getDate()).
- getElevation();
- // Filter
- if (trueElevation < threshold) {
- measurement.setEnabled(false);
- }
- }
- }