Examples with LoggedEvent org.orekit.propagation.events.EventsLogger.LoggedEvent used on opensource projects

Example 11 with LoggedEvent

use of org.orekit.propagation.events.EventsLogger.LoggedEvent in project Orekit by CS-SI.

the class GroundFieldOfViewDetectorTest method testCaseSimilarToElevationDetector.

/**
 * Check FoV detector is similar to {@link ElevationDetector} when using
 * zenith pointing.
 *
 * @throws OrekitException on error.
 */
@Test
public void testCaseSimilarToElevationDetector() throws OrekitException {
    // setup
    double pi = FastMath.PI;
    // arbitrary date
    AbsoluteDate date = AbsoluteDate.J2000_EPOCH;
    AbsoluteDate endDate = date.shiftedBy(Constants.JULIAN_DAY);
    Frame eci = FramesFactory.getGCRF();
    Frame ecef = FramesFactory.getITRF(IERSConventions.IERS_2010, true);
    BodyShape earth = new OneAxisEllipsoid(Constants.WGS84_EARTH_EQUATORIAL_RADIUS, Constants.WGS84_EARTH_FLATTENING, ecef);
    GeodeticPoint gp = new GeodeticPoint(FastMath.toRadians(39), FastMath.toRadians(77), 0);
    TopocentricFrame topo = new TopocentricFrame(earth, gp, "topo");
    // iss like orbit
    KeplerianOrbit orbit = new KeplerianOrbit(6378137 + 400e3, 0, FastMath.toRadians(51.65), 0, 0, 0, PositionAngle.TRUE, eci, date, Constants.EGM96_EARTH_MU);
    Propagator prop = new KeplerianPropagator(orbit);
    // compute expected result
    ElevationDetector elevationDetector = new ElevationDetector(topo).withConstantElevation(pi / 6).withMaxCheck(5.0);
    EventsLogger logger = new EventsLogger();
    prop.addEventDetector(logger.monitorDetector(elevationDetector));
    prop.propagate(endDate);
    List<LoggedEvent> expected = logger.getLoggedEvents();
    // action
    // construct similar FoV based detector
    // half width of 60 deg pointed along +Z in antenna frame
    // not a perfect small circle b/c FoV makes a polygon with great circles
    FieldOfView fov = new FieldOfView(Vector3D.PLUS_K, Vector3D.PLUS_I, pi / 3, 16, 0);
    // simple case for fixed pointing to be similar to elevation detector.
    // could define new frame with varying rotation for slewing antenna.
    GroundFieldOfViewDetector fovDetector = new GroundFieldOfViewDetector(topo, fov).withMaxCheck(5.0);
    Assert.assertSame(topo, fovDetector.getFrame());
    Assert.assertSame(fov, fovDetector.getFieldOfView());
    logger = new EventsLogger();
    prop = new KeplerianPropagator(orbit);
    prop.addEventDetector(logger.monitorDetector(fovDetector));
    prop.propagate(endDate);
    List<LoggedEvent> actual = logger.getLoggedEvents();
    // verify
    Assert.assertEquals(2, expected.size());
    Assert.assertEquals(2, actual.size());
    for (int i = 0; i < 2; i++) {
        AbsoluteDate expectedDate = expected.get(i).getState().getDate();
        AbsoluteDate actualDate = actual.get(i).getState().getDate();
        // same event times to within 1s.
        Assert.assertEquals(expectedDate.durationFrom(actualDate), 0.0, 1.0);
    }
}

Example 12 with LoggedEvent

use of org.orekit.propagation.events.EventsLogger.LoggedEvent in project Orekit by CS-SI.

the class LatitudeCrossingDetectorTest method testRegularCrossing.

@Test
public void testRegularCrossing() throws OrekitException {
    final OneAxisEllipsoid earth = new OneAxisEllipsoid(Constants.WGS84_EARTH_EQUATORIAL_RADIUS, Constants.WGS84_EARTH_FLATTENING, FramesFactory.getITRF(IERSConventions.IERS_2010, true));
    LatitudeCrossingDetector d = new LatitudeCrossingDetector(60.0, 1.e-6, earth, FastMath.toRadians(60.0)).withHandler(new ContinueOnEvent<LatitudeCrossingDetector>());
    Assert.assertEquals(60.0, d.getMaxCheckInterval(), 1.0e-15);
    Assert.assertEquals(1.0e-6, d.getThreshold(), 1.0e-15);
    Assert.assertEquals(60.0, FastMath.toDegrees(d.getLatitude()), 1.0e-14);
    Assert.assertEquals(AbstractDetector.DEFAULT_MAX_ITER, d.getMaxIterationCount());
    final TimeScale utc = TimeScalesFactory.getUTC();
    final Vector3D position = new Vector3D(-6142438.668, 3492467.56, -25767.257);
    final Vector3D velocity = new Vector3D(505.848, 942.781, 7435.922);
    final AbsoluteDate date = new AbsoluteDate(2003, 9, 16, utc);
    final Orbit orbit = new EquinoctialOrbit(new PVCoordinates(position, velocity), FramesFactory.getEME2000(), date, Constants.EIGEN5C_EARTH_MU);
    Propagator propagator = new EcksteinHechlerPropagator(orbit, Constants.EIGEN5C_EARTH_EQUATORIAL_RADIUS, Constants.EIGEN5C_EARTH_MU, Constants.EIGEN5C_EARTH_C20, Constants.EIGEN5C_EARTH_C30, Constants.EIGEN5C_EARTH_C40, Constants.EIGEN5C_EARTH_C50, Constants.EIGEN5C_EARTH_C60);
    EventsLogger logger = new EventsLogger();
    propagator.addEventDetector(logger.monitorDetector(d));
    propagator.propagate(date.shiftedBy(Constants.JULIAN_DAY));
    AbsoluteDate previous = null;
    for (LoggedEvent e : logger.getLoggedEvents()) {
        SpacecraftState state = e.getState();
        double latitude = earth.transform(state.getPVCoordinates(earth.getBodyFrame()).getPosition(), earth.getBodyFrame(), null).getLatitude();
        Assert.assertEquals(60.0, FastMath.toDegrees(latitude), 3.0e-10);
        if (previous != null) {
            if (e.isIncreasing()) {
                // crossing northward
                Assert.assertTrue(state.getPVCoordinates().getVelocity().getZ() > 3611.0);
                Assert.assertEquals(4954.70, state.getDate().durationFrom(previous), 0.01);
            } else {
                // crossing southward
                Assert.assertTrue(state.getPVCoordinates().getVelocity().getZ() < -3615.0);
                Assert.assertEquals(956.17, state.getDate().durationFrom(previous), 0.01);
            }
        }
        previous = state.getDate();
    }
    Assert.assertEquals(30, logger.getLoggedEvents().size());
}

Example 13 with LoggedEvent

use of org.orekit.propagation.events.EventsLogger.LoggedEvent in project Orekit by CS-SI.

the class ElevationExtremumDetectorTest method testLEO.

@Test
public void testLEO() throws OrekitException {
    final OneAxisEllipsoid earth = new OneAxisEllipsoid(Constants.WGS84_EARTH_EQUATORIAL_RADIUS, Constants.WGS84_EARTH_FLATTENING, FramesFactory.getITRF(IERSConventions.IERS_2010, true));
    final GeodeticPoint gp = new GeodeticPoint(FastMath.toRadians(51.0), FastMath.toRadians(66.6), 300.0);
    final ElevationExtremumDetector raw = new ElevationExtremumDetector(new TopocentricFrame(earth, gp, "test")).withMaxCheck(60).withThreshold(1.e-6).withHandler(new ContinueOnEvent<ElevationExtremumDetector>());
    final EventSlopeFilter<ElevationExtremumDetector> maxElevationDetector = new EventSlopeFilter<ElevationExtremumDetector>(raw, FilterType.TRIGGER_ONLY_DECREASING_EVENTS);
    Assert.assertEquals(60.0, raw.getMaxCheckInterval(), 1.0e-15);
    Assert.assertEquals(1.0e-6, raw.getThreshold(), 1.0e-15);
    Assert.assertEquals(AbstractDetector.DEFAULT_MAX_ITER, raw.getMaxIterationCount());
    Assert.assertEquals("test", raw.getTopocentricFrame().getName());
    final TimeScale utc = TimeScalesFactory.getUTC();
    final Vector3D position = new Vector3D(-6142438.668, 3492467.56, -25767.257);
    final Vector3D velocity = new Vector3D(505.848, 942.781, 7435.922);
    final AbsoluteDate date = new AbsoluteDate(2003, 9, 16, utc);
    final Orbit orbit = new EquinoctialOrbit(new PVCoordinates(position, velocity), FramesFactory.getEME2000(), date, Constants.EIGEN5C_EARTH_MU);
    Propagator propagator = new EcksteinHechlerPropagator(orbit, Constants.EIGEN5C_EARTH_EQUATORIAL_RADIUS, Constants.EIGEN5C_EARTH_MU, Constants.EIGEN5C_EARTH_C20, Constants.EIGEN5C_EARTH_C30, Constants.EIGEN5C_EARTH_C40, Constants.EIGEN5C_EARTH_C50, Constants.EIGEN5C_EARTH_C60);
    EventsLogger logger = new EventsLogger();
    propagator.addEventDetector(logger.monitorDetector(maxElevationDetector));
    propagator.propagate(date.shiftedBy(Constants.JULIAN_DAY));
    int visibleEvents = 0;
    for (LoggedEvent e : logger.getLoggedEvents()) {
        final double eMinus = raw.getElevation(e.getState().shiftedBy(-10.0));
        final double e0 = raw.getElevation(e.getState());
        final double ePlus = raw.getElevation(e.getState().shiftedBy(+10.0));
        if (e0 > FastMath.toRadians(5.0)) {
            ++visibleEvents;
        }
        Assert.assertTrue(e0 > eMinus);
        Assert.assertTrue(e0 > ePlus);
    }
    Assert.assertEquals(15, logger.getLoggedEvents().size());
    Assert.assertEquals(6, visibleEvents);
}

Example 14 with LoggedEvent

use of org.orekit.propagation.events.EventsLogger.LoggedEvent in project Orekit by CS-SI.

the class EventEnablingPredicateFilterTest method testExceedHistoryForward.

@Test
public void testExceedHistoryForward() throws OrekitException, IOException {
    final double period = 900.0;
    // the raw detector should trigger one event at each 900s period
    final DateDetector raw = new DateDetector(orbit.getDate().shiftedBy(-0.5 * period)).withMaxCheck(period / 3).withHandler(new ContinueOnEvent<DateDetector>());
    for (int i = 0; i < 300; ++i) {
        raw.addEventDate(orbit.getDate().shiftedBy((i + 0.5) * period));
    }
    // in fact, we will filter out half of these events, so we get only one event every 2 periods
    final EventEnablingPredicateFilter<DateDetector> filtered = new EventEnablingPredicateFilter<DateDetector>(raw, new EnablingPredicate<DateDetector>() {

        public boolean eventIsEnabled(SpacecraftState state, DateDetector eventDetector, double g) {
            double nbPeriod = state.getDate().durationFrom(orbit.getDate()) / period;
            return ((int) FastMath.floor(nbPeriod)) % 2 == 1;
        }
    });
    Propagator propagator = new KeplerianPropagator(orbit);
    EventsLogger logger = new EventsLogger();
    propagator.addEventDetector(logger.monitorDetector(filtered));
    propagator.propagate(orbit.getDate().shiftedBy(301 * period));
    List<LoggedEvent> events = logger.getLoggedEvents();
    // 300 periods, 150 events as half of them are filtered out
    Assert.assertEquals(150, events.size());
    // as we have encountered a lot of enabling status changes, we exceeded the internal history
    // if we try to display again the filtered g function for dates far in the past,
    // we will not see the zero crossings anymore, they have been lost
    propagator.clearEventsDetectors();
    for (double dt = 5000.0; dt < 10000.0; dt += 3.0) {
        double filteredG = filtered.g(propagator.propagate(orbit.getDate().shiftedBy(dt)));
        Assert.assertTrue(filteredG < 0.0);
    }
    // that are still inside the history, we still see the zero crossings
    for (double dt = 195400.0; dt < 196200.0; dt += 3.0) {
        double filteredG = filtered.g(propagator.propagate(orbit.getDate().shiftedBy(dt)));
        if (dt < 195750) {
            Assert.assertTrue(filteredG > 0.0);
        } else {
            Assert.assertTrue(filteredG < 0.0);
        }
    }
}

Example 15 with LoggedEvent

use of org.orekit.propagation.events.EventsLogger.LoggedEvent in project Orekit by CS-SI.

the class EventEnablingPredicateFilterTest method testResetState.

@Test
public void testResetState() throws OrekitException {
    final List<AbsoluteDate> reset = new ArrayList<AbsoluteDate>();
    DateDetector raw = new DateDetector(orbit.getDate().shiftedBy(3600.0)).withMaxCheck(1000.0).withHandler(new EventHandler<DateDetector>() {

        public SpacecraftState resetState(DateDetector detector, SpacecraftState oldState) {
            reset.add(oldState.getDate());
            return oldState;
        }

        public Action eventOccurred(SpacecraftState s, DateDetector detector, boolean increasing) {
            return Action.RESET_STATE;
        }
    });
    for (int i = 2; i < 10; ++i) {
        raw.addEventDate(orbit.getDate().shiftedBy(i * 3600.0));
    }
    EventEnablingPredicateFilter<DateDetector> filtered = new EventEnablingPredicateFilter<DateDetector>(raw, new EnablingPredicate<DateDetector>() {

        public boolean eventIsEnabled(SpacecraftState state, DateDetector eventDetector, double g) {
            return state.getDate().durationFrom(orbit.getDate()) > 20000.0;
        }
    });
    Propagator propagator = new KeplerianPropagator(orbit);
    EventsLogger logger = new EventsLogger();
    propagator.addEventDetector(logger.monitorDetector(filtered));
    propagator.propagate(orbit.getDate().shiftedBy(Constants.JULIAN_DAY));
    List<LoggedEvent> events = logger.getLoggedEvents();
    Assert.assertEquals(4, events.size());
    Assert.assertEquals(6 * 3600, events.get(0).getState().getDate().durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(7 * 3600, events.get(1).getState().getDate().durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(8 * 3600, events.get(2).getState().getDate().durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(9 * 3600, events.get(3).getState().getDate().durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(4, reset.size());
    Assert.assertEquals(6 * 3600, reset.get(0).durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(7 * 3600, reset.get(1).durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(8 * 3600, reset.get(2).durationFrom(orbit.getDate()), 1.0e-6);
    Assert.assertEquals(9 * 3600, reset.get(3).durationFrom(orbit.getDate()), 1.0e-6);
}