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added noise to sim #11

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Merged
JmcRobbie merged 1 commit into from
Sep 28, 2018
Merged

added noise to sim #11

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16 changes: 12 additions & 4 deletions simulator/src/main/java/msp/simulator/satellite/sensors/Magnetometer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
import org.orekit.propagation.SpacecraftState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hipparchus.random.RandomDataGenerator;

import msp.simulator.environment.Environment;
import msp.simulator.environment.geomagneticField.EarthMagneticField;
Expand All @@ -36,9 +37,14 @@
* @author Florian CHAUBEYRE <chaubeyre.f@gmail.com>
*/
public class Magnetometer {


/* ******* Public Static Attributes ******* */



/* Random number generator */
private RandomDataGenerator randomDataGenerator = new RandomDataGenerator(1000);

/** This intensity is used to generate a random number to be
* added to each components of the true magnetic field.
* (nanoTesla)
Expand Down Expand Up @@ -85,13 +91,15 @@ public Magnetometer(Environment environment, Assembly assembly) {
*/
public GeoMagneticElements retrieveNoisyField() {
/* Perfect Measure. */


GeoMagneticElements perfectMeasure = this.retrievePerfectField();

/* Normally distributed random noise contribution. */
Vector3D noise = new Vector3D ( new double[] {
2 * (FastMath.random() - 0.5) * this.noiseIntensity,
2 * (FastMath.random() - 0.5) * this.noiseIntensity,
2 * (FastMath.random() - 0.5) * this.noiseIntensity
randomDataGenerator.nextNormal(0, this.noiseIntensity),
randomDataGenerator.nextNormal(0, this.noiseIntensity),
randomDataGenerator.nextNormal(0, this.noiseIntensity)
});

/* Disturbing the perfect measurement. */
Expand Down