diff options
| -rw-r--r-- | core/java/android/hardware/GeomagneticField.java | 121 |
1 files changed, 60 insertions, 61 deletions
diff --git a/core/java/android/hardware/GeomagneticField.java b/core/java/android/hardware/GeomagneticField.java index b4c04b1..96fbe77 100644 --- a/core/java/android/hardware/GeomagneticField.java +++ b/core/java/android/hardware/GeomagneticField.java @@ -26,8 +26,9 @@ import java.util.GregorianCalendar; * <p>This uses the World Magnetic Model produced by the United States National * Geospatial-Intelligence Agency. More details about the model can be found at * <a href="http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml">http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml</a>. - * This class currently uses WMM-2005 which is valid until 2010, but should - * produce acceptable results for several years after that. + * This class currently uses WMM-2010 which is valid until 2015, but should + * produce acceptable results for several years after that. Future versions of + * Android may use a newer version of the model. */ public class GeomagneticField { // The magnetic field at a given point, in nonoteslas in geodetic @@ -43,75 +44,73 @@ public class GeomagneticField { // Constants from WGS84 (the coordinate system used by GPS) static private final float EARTH_SEMI_MAJOR_AXIS_KM = 6378.137f; - static private final float EARTH_SEMI_MINOR_AXIS_KM = 6356.7523f; + static private final float EARTH_SEMI_MINOR_AXIS_KM = 6356.7523142f; static private final float EARTH_REFERENCE_RADIUS_KM = 6371.2f; // These coefficients and the formulae used below are from: - // NOAA Technical Report: The US/UK World Magnetic Model for 2005-2010 + // NOAA Technical Report: The US/UK World Magnetic Model for 2010-2015 static private final float[][] G_COEFF = new float[][] { - { 0f }, - { -29556.8f, -1671.7f }, - { -2340.6f, 3046.9f, 1657.0f }, - { 1335.4f, -2305.1f, 1246.7f, 674.0f }, - { 919.8f, 798.1f, 211.3f, -379.4f, 100.0f }, - { -227.4f, 354.6f, 208.7f, -136.5f, -168.3f, -14.1f }, - { 73.2f, 69.7f, 76.7f, -151.2f, -14.9f, 14.6f, -86.3f }, - { 80.1f, -74.5f, -1.4f, 38.5f, 12.4f, 9.5f, 5.7f, 1.8f }, - { 24.9f, 7.7f, -11.6f, -6.9f, -18.2f, 10.0f, 9.2f, -11.6f, -5.2f }, - { 5.6f, 9.9f, 3.5f, -7.0f, 5.1f, -10.8f, -1.3f, 8.8f, -6.7f, -9.1f }, - { -2.3f, -6.3f, 1.6f, -2.6f, 0.0f, 3.1f, 0.4f, 2.1f, 3.9f, -0.1f, -2.3f }, - { 2.8f, -1.6f, -1.7f, 1.7f, -0.1f, 0.1f, -0.7f, 0.7f, 1.8f, 0.0f, 1.1f, 4.1f }, - { -2.4f, -0.4f, 0.2f, 0.8f, -0.3f, 1.1f, -0.5f, 0.4f, -0.3f, -0.3f, -0.1f, - -0.3f, -0.1f } }; + { 0.0f }, + { -29496.6f, -1586.3f }, + { -2396.6f, 3026.1f, 1668.6f }, + { 1340.1f, -2326.2f, 1231.9f, 634.0f }, + { 912.6f, 808.9f, 166.7f, -357.1f, 89.4f }, + { -230.9f, 357.2f, 200.3f, -141.1f, -163.0f, -7.8f }, + { 72.8f, 68.6f, 76.0f, -141.4f, -22.8f, 13.2f, -77.9f }, + { 80.5f, -75.1f, -4.7f, 45.3f, 13.9f, 10.4f, 1.7f, 4.9f }, + { 24.4f, 8.1f, -14.5f, -5.6f, -19.3f, 11.5f, 10.9f, -14.1f, -3.7f }, + { 5.4f, 9.4f, 3.4f, -5.2f, 3.1f, -12.4f, -0.7f, 8.4f, -8.5f, -10.1f }, + { -2.0f, -6.3f, 0.9f, -1.1f, -0.2f, 2.5f, -0.3f, 2.2f, 3.1f, -1.0f, -2.8f }, + { 3.0f, -1.5f, -2.1f, 1.7f, -0.5f, 0.5f, -0.8f, 0.4f, 1.8f, 0.1f, 0.7f, 3.8f }, + { -2.2f, -0.2f, 0.3f, 1.0f, -0.6f, 0.9f, -0.1f, 0.5f, -0.4f, -0.4f, 0.2f, -0.8f, 0.0f } }; static private final float[][] H_COEFF = new float[][] { - { 0f }, - { 0.0f, 5079.8f }, - { 0.0f, -2594.7f, -516.7f }, - { 0.0f, -199.9f, 269.3f, -524.2f }, - { 0.0f, 281.5f, -226.0f, 145.8f, -304.7f }, - { 0.0f, 42.4f, 179.8f, -123.0f, -19.5f, 103.6f }, - { 0.0f, -20.3f, 54.7f, 63.6f, -63.4f, -0.1f, 50.4f }, - { 0.0f, -61.5f, -22.4f, 7.2f, 25.4f, 11.0f, -26.4f, -5.1f }, - { 0.0f, 11.2f, -21.0f, 9.6f, -19.8f, 16.1f, 7.7f, -12.9f, -0.2f }, - { 0.0f, -20.1f, 12.9f, 12.6f, -6.7f, -8.1f, 8.0f, 2.9f, -7.9f, 6.0f }, - { 0.0f, 2.4f, 0.2f, 4.4f, 4.8f, -6.5f, -1.1f, -3.4f, -0.8f, -2.3f, -7.9f }, - { 0.0f, 0.3f, 1.2f, -0.8f, -2.5f, 0.9f, -0.6f, -2.7f, -0.9f, -1.3f, -2.0f, -1.2f }, - { 0.0f, -0.4f, 0.3f, 2.4f, -2.6f, 0.6f, 0.3f, 0.0f, 0.0f, 0.3f, -0.9f, -0.4f, - 0.8f } }; + { 0.0f }, + { 0.0f, 4944.4f }, + { 0.0f, -2707.7f, -576.1f }, + { 0.0f, -160.2f, 251.9f, -536.6f }, + { 0.0f, 286.4f, -211.2f, 164.3f, -309.1f }, + { 0.0f, 44.6f, 188.9f, -118.2f, 0.0f, 100.9f }, + { 0.0f, -20.8f, 44.1f, 61.5f, -66.3f, 3.1f, 55.0f }, + { 0.0f, -57.9f, -21.1f, 6.5f, 24.9f, 7.0f, -27.7f, -3.3f }, + { 0.0f, 11.0f, -20.0f, 11.9f, -17.4f, 16.7f, 7.0f, -10.8f, 1.7f }, + { 0.0f, -20.5f, 11.5f, 12.8f, -7.2f, -7.4f, 8.0f, 2.1f, -6.1f, 7.0f }, + { 0.0f, 2.8f, -0.1f, 4.7f, 4.4f, -7.2f, -1.0f, -3.9f, -2.0f, -2.0f, -8.3f }, + { 0.0f, 0.2f, 1.7f, -0.6f, -1.8f, 0.9f, -0.4f, -2.5f, -1.3f, -2.1f, -1.9f, -1.8f }, + { 0.0f, -0.9f, 0.3f, 2.1f, -2.5f, 0.5f, 0.6f, 0.0f, 0.1f, 0.3f, -0.9f, -0.2f, 0.9f } }; static private final float[][] DELTA_G = new float[][] { - { 0f }, - { 8.0f, 10.6f }, - { -15.1f, -7.8f, -0.8f }, - { 0.4f, -2.6f, -1.2f, -6.5f }, - { -2.5f, 2.8f, -7.0f, 6.2f, -3.8f }, - { -2.8f, 0.7f, -3.2f, -1.1f, 0.1f, -0.8f }, - { -0.7f, 0.4f, -0.3f, 2.3f, -2.1f, -0.6f, 1.4f }, - { 0.2f, -0.1f, -0.3f, 1.1f, 0.6f, 0.5f, -0.4f, 0.6f }, - { 0.1f, 0.3f, -0.4f, 0.3f, -0.3f, 0.2f, 0.4f, -0.7f, 0.4f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } }; + { 0.0f }, + { 11.6f, 16.5f }, + { -12.1f, -4.4f, 1.9f }, + { 0.4f, -4.1f, -2.9f, -7.7f }, + { -1.8f, 2.3f, -8.7f, 4.6f, -2.1f }, + { -1.0f, 0.6f, -1.8f, -1.0f, 0.9f, 1.0f }, + { -0.2f, -0.2f, -0.1f, 2.0f, -1.7f, -0.3f, 1.7f }, + { 0.1f, -0.1f, -0.6f, 1.3f, 0.4f, 0.3f, -0.7f, 0.6f }, + { -0.1f, 0.1f, -0.6f, 0.2f, -0.2f, 0.3f, 0.3f, -0.6f, 0.2f }, + { 0.0f, -0.1f, 0.0f, 0.3f, -0.4f, -0.3f, 0.1f, -0.1f, -0.4f, -0.2f }, + { 0.0f, 0.0f, -0.1f, 0.2f, 0.0f, -0.1f, -0.2f, 0.0f, -0.1f, -0.2f, -0.2f }, + { 0.0f, 0.0f, 0.0f, 0.1f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.1f, 0.0f }, + { 0.0f, 0.0f, 0.1f, 0.1f, -0.1f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, -0.1f, 0.1f } }; static private final float[][] DELTA_H = new float[][] { - { 0f }, - { 0.0f, -20.9f }, - { 0.0f, -23.2f, -14.6f }, - { 0.0f, 5.0f, -7.0f, -0.6f }, - { 0.0f, 2.2f, 1.6f, 5.8f, 0.1f }, - { 0.0f, 0.0f, 1.7f, 2.1f, 4.8f, -1.1f }, - { 0.0f, -0.6f, -1.9f, -0.4f, -0.5f, -0.3f, 0.7f }, - { 0.0f, 0.6f, 0.4f, 0.2f, 0.3f, -0.8f, -0.2f, 0.1f }, - { 0.0f, -0.2f, 0.1f, 0.3f, 0.4f, 0.1f, -0.2f, 0.4f, 0.4f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }, - { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } }; + { 0.0f }, + { 0.0f, -25.9f }, + { 0.0f, -22.5f, -11.8f }, + { 0.0f, 7.3f, -3.9f, -2.6f }, + { 0.0f, 1.1f, 2.7f, 3.9f, -0.8f }, + { 0.0f, 0.4f, 1.8f, 1.2f, 4.0f, -0.6f }, + { 0.0f, -0.2f, -2.1f, -0.4f, -0.6f, 0.5f, 0.9f }, + { 0.0f, 0.7f, 0.3f, -0.1f, -0.1f, -0.8f, -0.3f, 0.3f }, + { 0.0f, -0.1f, 0.2f, 0.4f, 0.4f, 0.1f, -0.1f, 0.4f, 0.3f }, + { 0.0f, 0.0f, -0.2f, 0.0f, -0.1f, 0.1f, 0.0f, -0.2f, 0.3f, 0.2f }, + { 0.0f, 0.1f, -0.1f, 0.0f, -0.1f, -0.1f, 0.0f, -0.1f, -0.2f, 0.0f, -0.1f }, + { 0.0f, 0.0f, 0.1f, 0.0f, 0.1f, 0.0f, 0.1f, 0.0f, -0.1f, -0.1f, 0.0f, -0.1f }, + { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.1f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f } }; static private final long BASE_TIME = - new GregorianCalendar(2005, 1, 1).getTimeInMillis(); + new GregorianCalendar(2010, 1, 1).getTimeInMillis(); // The ratio between the Gauss-normalized associated Legendre functions and // the Schmid quasi-normalized ones. Compute these once staticly since they @@ -191,7 +190,7 @@ public class GeomagneticField { // We now compute the magnetic field strength given the geocentric // location. The magnetic field is the derivative of the potential // function defined by the model. See NOAA Technical Report: The US/UK - // World Magnetic Model for 2005-2010 for the derivation. + // World Magnetic Model for 2010-2015 for the derivation. float gcX = 0.0f; // Geocentric northwards component. float gcY = 0.0f; // Geocentric eastwards component. float gcZ = 0.0f; // Geocentric downwards component. @@ -406,4 +405,4 @@ public class GeomagneticField { } return schmidtQuasiNorm; } -}
\ No newline at end of file +} |