| /******************************************************************************* |
| * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Pierre Allard, |
| * Regent L'Archeveque - initial API and implementation |
| * |
| * SPDX-License-Identifier: EPL-1.0 |
| *******************************************************************************/ |
| package org.eclipse.apogy.examples.satellite.impl; |
| |
| import org.eclipse.apogy.core.environment.earth.HorizontalCoordinates; |
| import org.eclipse.apogy.core.environment.earth.surface.AstronomyUtils; |
| import org.eclipse.apogy.core.environment.orbit.earth.VisibilityPass; |
| import org.eclipse.apogy.core.environment.orbit.earth.VisibilityPassSpacecraftPosition; |
| import org.eclipse.apogy.examples.satellite.Satellite; |
| |
| public class DefaultConstellationPlannerCustomImpl extends DefaultConstellationPlannerImpl { |
| |
| @Override |
| public boolean isValid(VisibilityPass visibilityPass) { |
| // Check if there is a satellite associated to the OrbitModel. |
| Satellite satellite = getSatellite(visibilityPass.getOrbitModel()); |
| if (satellite == null) |
| return false; |
| |
| // Finds the closest point the satellite comes to the target in the pass. |
| VisibilityPassSpacecraftPosition closestPosition = visibilityPass.getPositionHistory() |
| .getSmallestSpacecraftCrossTrackAnglePosition(); |
| if (closestPosition == null) |
| return false; |
| |
| /* |
| * Verify if the satellite roll capability must be considered by the planner. |
| */ |
| if (isSatelliteRollCommandValid()) { |
| |
| // Checks to see if the pass brings us close enough to the target. |
| if (Math.abs(closestPosition.getSpacecraftCrossTrackAngle()) > Math.abs(satellite.getMaximumRoll())) |
| return false; |
| } |
| |
| /* |
| * Verify if passes that occur in umbra must be considered. |
| */ |
| if (isUmbraPassesValid()) { |
| |
| // Gets the location of the target |
| double observerLongitude = visibilityPass.getSurfaceLocation().getLongitude(); |
| double observerLatitude = visibilityPass.getSurfaceLocation().getLatitude(); |
| |
| // Finds the horizontal coordinates of the sun at the target at the time of the |
| // closest approach. |
| HorizontalCoordinates sunCoordinates = AstronomyUtils.INSTANCE |
| .getHorizontalSunPosition(closestPosition.getTime(), observerLongitude, observerLatitude); |
| |
| // Returns true if the sun is at least <x> degrees above the horizon. |
| return sunCoordinates.getAltitude() > Math.toRadians(getSunHorizonAngleUmbraThreshold()); |
| } |
| |
| return true; |
| } |
| |
| } // DefaultConstellationPlannerImpl |
