1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef GEOMAGNETIC_FIELD_H 17 #define GEOMAGNETIC_FIELD_H 18 19 #include <vector> 20 21 class GeomagneticField { 22 public: 23 GeomagneticField(float latitude, float longitude, float altitude, int64_t timeMillis); 24 ~GeomagneticField() = default; 25 float ObtainX(); 26 float ObtainY(); 27 float ObtainZ(); 28 float ObtainGeomagneticDip(); 29 float ObtainDeflectionAngle(); 30 float ObtainLevelIntensity(); 31 float ObtainTotalIntensity(); 32 33 private: 34 std::vector<std::vector<float>> GetSchmidtQuasiNormalFactors(int32_t expansionDegree); 35 void CalculateGeomagneticComponent(double latDiffRad, int64_t timeMillis); 36 void GetLongitudeTrigonometric(); 37 void GetRelativeRadiusPower(); 38 void CalibrateGeocentricCoordinates(float latitude, float longitude, float altitude); 39 void InitLegendreTable(int32_t expansionDegree, float thetaRad); 40 double ToDegrees(double angrad); 41 double ToRadians(double angdeg); 42 }; 43 #endif // GEOMAGNETIC_FIELD_H