Marius Eggert
8b6d3c9835
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119 lines
7.6 KiB
C++
119 lines
7.6 KiB
C++
/*
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* Igrf13Model.h
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*
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* Created on: 10 Mar 2022
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* Author: Robin Marquardt
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* Description: Calculates the magnetic field vector of earth with the IGRF Model.
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* Sources: https://www.ngdc.noaa.gov/IAGA/vmod/igrf.html
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* https://doi.org/10.1186/s40623-020-01288-x
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* J. Davis, Mathematical Modeling of Earth's Magnetic Field, TN, 2004
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*
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* [Conversion of ENU (geocentric) to IJK: Skript Bahnmechanik für Raumfahrzeuge,
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* Prof. Dr.-Ing. Stefanos Fasoulas / Dr.-Ing. Frank Zimmermann]
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*
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*/
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#ifndef IGRF13MODEL_H_
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#define IGRF13MODEL_H_
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#include <fsfw/parameters/HasParametersIF.h>
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//#include <cmath>
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#include <stdint.h>
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#include <string.h>
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#include <sys/time.h>
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// Output should be transformed to [T] instead of [nT]
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// Updating Coefficients has to be implemented yet. Question, updating everyday ?
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class Igrf13Model:public HasParametersIF{
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public:
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Igrf13Model();
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virtual ~Igrf13Model();
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// Main Function
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void magFieldComp(const double longitude, const double gcLatitude, const double altitude, timeval timeOfMagMeasurement,double* magFieldModelInertial);
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// Right now the radius for igrf is simply with r0 + altitude calculated. In reality the radius is oriented from the satellite to earth COM
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// Difference up to 25 km, which is 5 % of the total flight altitude
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/* Inputs:
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* - longitude: geocentric longitude [rad]
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* - latitude: geocentric latitude [rad]
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* - altitude: [m]
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* - timeOfMagMeasurement: time of actual measurement [s]
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*
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* Outputs:
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* - magFieldModelInertial: Magnetic Field Vector in IJK KOS [nT]*/
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// Coefficient wary over year, could be updated sometimes.
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void updateCoeffGH(timeval timeOfMagMeasurement); //Secular variation (SV)
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double magFieldModel[3];
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private:
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const double coeffG[14][13] = {{-29404.8,-2499.6, 1363.2, 903.0,-234.3, 66.0, 80.6, 23.7, 5.0,-1.9, 3.0,-2.0, 0.1},
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{ -1450.9, 2982.0,-2381.2, 809.5, 363.2, 65.5,-76.7, 9.7, 8.4,-6.2,-1.4,-0.1,-0.9},
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{ 0.0, 1677.0, 1236.2, 86.3, 187.8, 72.9, -8.2,-17.6, 2.9,-0.1,-2.5, 0.5, 0.5},
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{ 0.0, 0.0, 525.7,-309.4,-140.7,-121.5, 56.5, -0.5, -1.5, 1.7, 2.3, 1.3, 0.7},
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{ 0.0, 0.0, 0.0, 48.0,-151.2, -36.2, 15.8,-21.1, -1.1,-0.9,-0.9,-1.2,-0.3},
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{ 0.0, 0.0, 0.0, 0.0, 13.5, 13.5, 6.4, 15.3,-13.2, 0.7, 0.3, 0.7, 0.8},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, -64.7, -7.2, 13.7, 1.1,-0.9,-0.7, 0.3, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9.8,-16.5, 8.8, 1.9,-0.1, 0.5, 0.8},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.3, -9.3, 1.4, 1.4,-0.3, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-11.9,-2.4,-0.6,-0.5, 0.4},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-3.8, 0.2, 0.1, 0.1},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 3.1,-1.1, 0.5},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-0.3,-0.5},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-0.4}}; // [m][n] in nT
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const double coeffH[14][13] = {{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0 },
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{4652.5,-2991.6, -82.1, 281.9, 47.7,-19.1,-51.5, 8.4,-23.4, 3.4, 0.0,-1.2,-0.9},
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{ 0.0, -734.6, 241.9,-158.4, 208.3, 25.1,-16.9,-15.3, 11.0,-0.2, 2.5, 0.5, 0.6},
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{ 0.0, 0.0,-543.4, 199.7,-121.2, 52.8, 2.2, 12.8, 9.8, 3.6,-0.6, 1.4, 1.4},
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{ 0.0, 0.0, 0.0,-349.7, 32.3,-64.5, 23.5,-11.7, -5.1, 4.8,-0.4,-1.8,-0.4},
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{ 0.0, 0.0, 0.0, 0.0, 98.9, 8.9, -2.2, 14.9, -6.3,-8.6, 0.6, 0.1,-1.3},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 68.1,-27.2, 3.6, 7.8,-0.1,-0.2, 0.8,-0.1},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.8, -6.9, 0.4,-4.3,-1.7,-0.2, 0.3},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 2.8, -1.4,-3.4,-1.6, 0.6,-0.1},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9.6,-0.1,-3.0, 0.2, 0.5},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-8.8,-2.0,-0.9, 0.5},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-2.6, 0.0,-0.4},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.5,-0.4},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,-0.6}}; // [m][n] in nT
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const double svG[14][13] = {{5.7,-11.0, 2.2,-1.2,-0.3,-0.5,-0.1, 0.0, 0.0, 0.0, 0.0, 0.0 ,0.0},
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{7.4, -7.0, -5.9,-1.6, 0.5,-0.3,-0.2, 0.1, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, -2.1, 3.1,-5.9,-0.6, 0.4, 0.0,-0.1, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0,-12.0, 5.2, 0.2, 1.3, 0.7, 0.4, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0,-5.1, 1.3,-1.4, 0.1,-0.1, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.9, 0.0,-0.5, 0.4, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.9,-0.8, 0.3, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.8,-0.1, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.4, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}}; // [m][n] in nT
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const double svH[14][13] = {{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{-25.9,-30.2, 6.0,-0.1, 0.0, 0.0, 0.6,-0.2, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0,-22.4,-1.1, 6.5, 2.5,-1.6, 0.6, 0.6, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.5, 3.6,-0.6,-1.3,-0.8,-0.2, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0,-5.0, 3.0, 0.8,-0.2, 0.5, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.3, 0.0,-1.1,-0.3, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.1,-0.4, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.3, 0.5, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0},
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{ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0}}; // [m][n] in nT
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double updatedG[14][13];
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double updatedH[14][13];
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static const int igrfOrder = 13; // degree of truncation
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};
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#endif /* IGRF13MODEL_H_ */
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