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162 lines
7.4 KiB
C
162 lines
7.4 KiB
C
/**
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******************************************************************************
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*
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* @file WMMInternal.h
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief Include file of the WorldMagModel internal functionality.
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*
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef WMMINTERNAL_H_
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#define WMMINTERNAL_H_
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#include <pios_math.h>
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// internal constants
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#define TRUE ((uint16_t)1)
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#define FALSE ((uint16_t)0)
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#define WMM_MAX_MODEL_DEGREES 12
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#define WMM_MAX_SECULAR_VARIATION_MODEL_DEGREES 12
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#define NUMTERMS 91 // ((WMM_MAX_MODEL_DEGREES+1)*(WMM_MAX_MODEL_DEGREES+2)/2);
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#define NUMPCUP 92 // NUMTERMS +1
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#define NUMPCUPS 13 // WMM_MAX_MODEL_DEGREES +1
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// internal structure definitions
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typedef struct {
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float EditionDate;
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float epoch; // Base time of Geomagnetic model epoch (yrs)
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char ModelName[20];
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// float Main_Field_Coeff_G[NUMTERMS]; // C - Gauss coefficients of main geomagnetic model (nT)
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// float Main_Field_Coeff_H[NUMTERMS]; // C - Gauss coefficients of main geomagnetic model (nT)
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// float Secular_Var_Coeff_G[NUMTERMS]; // CD - Gauss coefficients of secular geomagnetic model (nT/yr)
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// float Secular_Var_Coeff_H[NUMTERMS]; // CD - Gauss coefficients of secular geomagnetic model (nT/yr)
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uint16_t nMax; // Maximum degree of spherical harmonic model
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uint16_t nMaxSecVar; // Maxumum degree of spherical harmonic secular model
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uint16_t SecularVariationUsed; // Whether or not the magnetic secular variation vector will be needed by program
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} WMMtype_MagneticModel;
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typedef struct {
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float a; // semi-major axis of the ellipsoid
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float b; // semi-minor axis of the ellipsoid
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float fla; // flattening
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float epssq; // first eccentricity squared
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float eps; // first eccentricity
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float re; // mean radius of ellipsoid
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} WMMtype_Ellipsoid;
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typedef struct {
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float lambda; // longitude
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float phi; // geodetic latitude
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float HeightAboveEllipsoid; // height above the ellipsoid (HaE)
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} WMMtype_CoordGeodetic;
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typedef struct {
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float lambda; // longitude
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float phig; // geocentric latitude
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float r; // distance from the center of the ellipsoid
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} WMMtype_CoordSpherical;
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typedef struct {
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uint16_t Year;
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uint16_t Month;
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uint16_t Day;
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float DecimalYear;
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} WMMtype_Date;
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typedef struct {
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float Pcup[NUMPCUP]; // Legendre Function
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float dPcup[NUMPCUP]; // Derivative of Lagendre fn
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} WMMtype_LegendreFunction;
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typedef struct {
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float Bx; // North
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float By; // East
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float Bz; // Down
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} WMMtype_MagneticResults;
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typedef struct {
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float RelativeRadiusPower[WMM_MAX_MODEL_DEGREES + 1]; // [earth_reference_radius_km / sph. radius ]^n
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float cos_mlambda[WMM_MAX_MODEL_DEGREES + 1]; // cp(m) - cosine of (m*spherical coord. longitude
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float sin_mlambda[WMM_MAX_MODEL_DEGREES + 1]; // sp(m) - sine of (m*spherical coord. longitude)
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} WMMtype_SphericalHarmonicVariables;
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typedef struct {
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float Decl; /* 1. Angle between the magnetic field vector and true north, positive east */
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float Incl; /*2. Angle between the magnetic field vector and the horizontal plane, positive down */
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float F; /*3. Magnetic Field Strength */
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float H; /*4. Horizontal Magnetic Field Strength */
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float X; /*5. Northern component of the magnetic field vector */
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float Y; /*6. Eastern component of the magnetic field vector */
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float Z; /*7. Downward component of the magnetic field vector */
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float GV; /*8. The Grid Variation */
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float Decldot; /*9. Yearly Rate of change in declination */
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float Incldot; /*10. Yearly Rate of change in inclination */
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float Fdot; /*11. Yearly rate of change in Magnetic field strength */
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float Hdot; /*12. Yearly rate of change in horizontal field strength */
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float Xdot; /*13. Yearly rate of change in the northern component */
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float Ydot; /*14. Yearly rate of change in the eastern component */
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float Zdot; /*15. Yearly rate of change in the downward component */
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float GVdot; /*16. Yearly rate of chnage in grid variation */
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} WMMtype_GeoMagneticElements;
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// Internal Function Prototypes
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void WMM_Set_Coeff_Array();
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int WMM_GeodeticToSpherical(WMMtype_CoordGeodetic *CoordGeodetic, WMMtype_CoordSpherical *CoordSpherical);
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int WMM_DateToYear(uint16_t month, uint16_t day, uint16_t year);
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int WMM_Geomag(WMMtype_CoordSpherical *CoordSpherical,
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WMMtype_CoordGeodetic *CoordGeodetic, WMMtype_GeoMagneticElements *GeoMagneticElements);
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int WMM_AssociatedLegendreFunction(WMMtype_CoordSpherical *CoordSpherical, uint16_t nMax, WMMtype_LegendreFunction *LegendreFunction);
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int WMM_CalculateGeoMagneticElements(WMMtype_MagneticResults *MagneticResultsGeo, WMMtype_GeoMagneticElements *GeoMagneticElements);
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int WMM_CalculateSecularVariation(WMMtype_MagneticResults *MagneticVariation, WMMtype_GeoMagneticElements *MagneticElements);
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int WMM_ComputeSphericalHarmonicVariables(WMMtype_CoordSpherical *
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CoordSpherical, uint16_t nMax, WMMtype_SphericalHarmonicVariables *SphVariables);
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int WMM_PcupLow(float *Pcup, float *dPcup, float x, uint16_t nMax);
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int WMM_PcupHigh(float *Pcup, float *dPcup, float x, uint16_t nMax);
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int WMM_RotateMagneticVector(WMMtype_CoordSpherical *,
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WMMtype_CoordGeodetic *CoordGeodetic,
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WMMtype_MagneticResults *MagneticResultsSph, WMMtype_MagneticResults *MagneticResultsGeo);
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int WMM_SecVarSummation(WMMtype_LegendreFunction *LegendreFunction,
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WMMtype_SphericalHarmonicVariables *
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SphVariables, WMMtype_CoordSpherical *CoordSpherical, WMMtype_MagneticResults *MagneticResults);
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int WMM_SecVarSummationSpecial(WMMtype_SphericalHarmonicVariables *
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SphVariables, WMMtype_CoordSpherical *CoordSpherical, WMMtype_MagneticResults *MagneticResults);
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int WMM_Summation(WMMtype_LegendreFunction *LegendreFunction,
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WMMtype_SphericalHarmonicVariables *SphVariables,
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WMMtype_CoordSpherical *CoordSpherical, WMMtype_MagneticResults *MagneticResults);
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int WMM_SummationSpecial(WMMtype_SphericalHarmonicVariables *
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SphVariables, WMMtype_CoordSpherical *CoordSpherical, WMMtype_MagneticResults *MagneticResults);
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float WMM_get_main_field_coeff_g(uint16_t index);
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float WMM_get_main_field_coeff_h(uint16_t index);
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float WMM_get_secular_var_coeff_g(uint16_t index);
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float WMM_get_secular_var_coeff_h(uint16_t index);
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#endif /* WMMINTERNAL_H_ */
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