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src/main/java/com/christianheina/communication/jantenna/phasedarray/ArrayFactor.java
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| /* | ||
| * Copyright 2024 Christian Heina | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| package com.christianheina.communication.jantenna.phasedarray; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
|
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| import org.apache.commons.math3.complex.Complex; | ||
| import org.apache.commons.math3.geometry.euclidean.threed.Vector3D; | ||
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| import com.christianheina.communication.jantenna.commons.Constants; | ||
| import com.christianheina.communication.jantenna.commons.ElectricField; | ||
| import com.christianheina.communication.jantenna.commons.Field; | ||
| import com.christianheina.communication.jantenna.commons.FieldType; | ||
| import com.christianheina.communication.jantenna.commons.ThetaPhi; | ||
| import com.christianheina.communication.jantenna.commons.WeightableElement; | ||
| import com.christianheina.communication.jantenna.phasedarray.config.PhasedArrayAntennaCalculationConfig; | ||
| import com.christianheina.communication.jantenna.phasedarray.exceptions.PhasedArrayAntennaException; | ||
|
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| /** | ||
| * Array factor functionality. | ||
| * | ||
| * @author Christian Heina ([email protected]) | ||
| */ | ||
| public class ArrayFactor { | ||
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| private ArrayFactor() { | ||
| /* Hidden Constructor */ } | ||
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| /** | ||
| * Create array factor | ||
| * | ||
| * @param frequency | ||
| * wavelength | ||
| * @param antennaArray | ||
| * antenna array to use when creating array factor | ||
| * @param angles | ||
| * angles used in the created array factor | ||
| * | ||
| * @return a field containing the array factor | ||
| */ | ||
| public static Field newArrayFactorAsync(double frequency, AntennaArray antennaArray, List<ThetaPhi> angles) { | ||
| ExecutorService executorService = Executors | ||
| .newFixedThreadPool(PhasedArrayAntennaCalculationConfig.getConfig().getNumberOfThreads()); | ||
| return newArrayFactorAsync(executorService, frequency, antennaArray, angles); | ||
| } | ||
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| /** | ||
| * Create array factor | ||
| * | ||
| * @param executorService | ||
| * the ExecutorService used for asynchronous array factor calculations | ||
| * @param frequency | ||
| * wavelength | ||
| * @param antennaArray | ||
| * antenna array to use when creating array factor | ||
| * @param angles | ||
| * angles used in the created array factor | ||
| * | ||
| * @return a field containing the array factor | ||
| */ | ||
| public static Field newArrayFactorAsync(ExecutorService executorService, double frequency, | ||
| AntennaArray antennaArray, List<ThetaPhi> angles) { | ||
| double lambda = Constants.VACCUM_SPEED_OF_LIGHT / frequency; | ||
| @SuppressWarnings("unchecked") | ||
| CompletableFuture<Complex>[] futureArray = new CompletableFuture[angles.size()]; | ||
| for (int i = 0; i < angles.size(); i++) { | ||
| futureArray[i] = calculateArrayFactorAsync(executorService, lambda, antennaArray, angles.get(i)); | ||
| } | ||
| executorService.shutdown(); | ||
| try { | ||
| CompletableFuture.allOf(futureArray).get(); | ||
| } catch (InterruptedException | ExecutionException e) { | ||
| throw new PhasedArrayAntennaException( | ||
| "Encountered unexpected exception while asynchronously calculating array factor", e); | ||
| } | ||
| List<Complex> fieldDataList = new ArrayList<>(angles.size()); | ||
| for (int i = 0; i < futureArray.length; i++) { | ||
| try { | ||
| fieldDataList.add(futureArray[i].get()); | ||
| } catch (InterruptedException | ExecutionException e) { | ||
| throw new PhasedArrayAntennaException( | ||
| "Encountered unexpected exception while asynchronously calculating array factor", e); | ||
| } | ||
| } | ||
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| return Field.newBuilder().setThetaPhiList(angles).addElectricField(ElectricField.RELATIVE_GAIN, fieldDataList) | ||
| .setFreqency(frequency).setFieldType(FieldType.FARFIELD).build(); | ||
| } | ||
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| private static CompletableFuture<Complex> calculateArrayFactorAsync(ExecutorService executorService, double lambda, | ||
| AntennaArray antennaArray, ThetaPhi angle) { | ||
| CompletableFuture<Complex> future = new CompletableFuture<>(); | ||
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| executorService.execute(() -> { | ||
| Complex sum = Complex.ZERO; | ||
| Vector3D k = PhasedArrayUtil.calculateWaveVector(lambda, angle); | ||
| for (WeightableElement antenna : antennaArray.getAntennaArray()) { | ||
| Complex vk = PhasedArrayUtil.calculateSteeringVector(k, antenna.getElementLocation()); | ||
| Complex c = antenna.getElementWeight().multiply(vk); | ||
| sum = sum.add(c); | ||
| } | ||
| future.complete(sum); | ||
| }); | ||
| future.exceptionally(e -> { | ||
| throw new PhasedArrayAntennaException( | ||
| "Encountered unexpected exception while asynchronously calculating array factor", e); | ||
| }); | ||
| return future; | ||
| } | ||
|
|
||
| } |
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87
src/test/java/com/christianheina/communication/jantenna/phasedarray/ArrayFactorTest.java
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| package com.christianheina.communication.jantenna.phasedarray; | ||
|
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.concurrent.Executors; | ||
|
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| import org.apache.commons.math3.complex.Complex; | ||
| import org.testng.Assert; | ||
| import org.testng.annotations.Test; | ||
|
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| import com.christianheina.communication.jantenna.commons.Constants; | ||
| import com.christianheina.communication.jantenna.commons.Field; | ||
| import com.christianheina.communication.jantenna.commons.ThetaPhi; | ||
| import com.christianheina.communication.jantenna.commons.Util; | ||
| import com.christianheina.communication.jantenna.phasedarray.weighting.WeightAlgorithm; | ||
|
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| /** | ||
| * Unit test for {@link ArrayFactor}. | ||
| * | ||
| * @author Christian Heina ([email protected]) | ||
| */ | ||
| @SuppressWarnings("javadoc") | ||
| public class ArrayFactorTest { | ||
|
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| @Test | ||
| public void newArrayFactorAsyncSuppliedExecutorServiceTest() { | ||
| double freq = 28 * Math.pow(10, 9); | ||
| List<ThetaPhi> angleList = ThetaPhi.equallySpacedSphere(1); | ||
| ThetaPhi steeringAngle = ThetaPhi.fromDegrees(90, 0); | ||
| AntennaArray antennaArray = AntennaArray.fromEquallySpacedArray(1, 24, 16, 0.5, freq, | ||
| WeightAlgorithm.newConjugateWeightAlgorithmFromLambda(Util.calculateLambda(freq), steeringAngle)); | ||
| Field field = ArrayFactor.newArrayFactorAsync(Executors.newSingleThreadExecutor(), freq, antennaArray, | ||
| angleList); | ||
| Assert.assertEquals(field.getThetaPhiList().size(), angleList.size()); | ||
| field.getAvailableElectricFields().forEach(electricFieldName -> { | ||
| List<Complex> electricFieldList = field.getElectricField(electricFieldName); | ||
| double max = Double.MIN_VALUE; | ||
| List<ThetaPhi> maxAngleList = new ArrayList<>(); | ||
| for (int i = 0; i < electricFieldList.size(); i++) { | ||
| if (electricFieldList.get(i).abs() >= max) { | ||
| max = electricFieldList.get(i).abs(); | ||
| maxAngleList.add(angleList.get(i)); | ||
| } | ||
| } | ||
| boolean hasAngleInList = false; | ||
| for (ThetaPhi thetaPhi : maxAngleList) { | ||
| if (thetaPhi.getTheta() == steeringAngle.getTheta() && thetaPhi.getPhi() == steeringAngle.getPhi()) { | ||
| hasAngleInList = true; | ||
| } | ||
| } | ||
| Assert.assertTrue(hasAngleInList); | ||
| }); | ||
|
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| } | ||
|
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| @Test | ||
| public void newArrayFactorAsyncTest() { | ||
| double freq = 28 * Math.pow(10, 9); | ||
| double lambda = Constants.VACCUM_SPEED_OF_LIGHT / freq; | ||
| List<ThetaPhi> angleList = ThetaPhi.equallySpacedSphere(1); | ||
| ThetaPhi steeringAngle = ThetaPhi.fromDegrees(90, 0); | ||
| AntennaArray antennaArray = AntennaArray.fromEquallySpacedArray(1, 24, 16, lambda / 2, freq, | ||
| WeightAlgorithm.newConjugateWeightAlgorithmFromLambda(lambda, steeringAngle)); | ||
| Field field = ArrayFactor.newArrayFactorAsync(freq, antennaArray, angleList); | ||
| Assert.assertEquals(field.getThetaPhiList().size(), angleList.size()); | ||
| field.getAvailableElectricFields().forEach(electricFieldName -> { | ||
| List<Complex> electricFieldList = field.getElectricField(electricFieldName); | ||
| double max = Double.MIN_VALUE; | ||
| List<ThetaPhi> maxAngleList = new ArrayList<>(); | ||
| for (int i = 0; i < electricFieldList.size(); i++) { | ||
| if (electricFieldList.get(i).abs() >= max) { | ||
| max = electricFieldList.get(i).abs(); | ||
| maxAngleList.add(angleList.get(i)); | ||
| } | ||
| } | ||
| boolean hasAngleInList = false; | ||
| for (ThetaPhi thetaPhi : maxAngleList) { | ||
| if (thetaPhi.getTheta() == steeringAngle.getTheta() && thetaPhi.getPhi() == steeringAngle.getPhi()) { | ||
| hasAngleInList = true; | ||
| } | ||
| } | ||
| Assert.assertTrue(hasAngleInList); | ||
| }); | ||
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| } | ||
|
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| } |