Wang1988.java
/* Copyright 2002-2024 Thales Alenia Space
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package org.orekit.models.earth.weather.water;
import org.hipparchus.CalculusFieldElement;
import org.hipparchus.analysis.polynomials.PolynomialFunction;
import org.hipparchus.util.FastMath;
import org.orekit.models.earth.troposphere.TroposphericModelUtils;
/** Conversion polynomial from "The Principle of the GPS Precise Positioning System", Wang et al, 1988.
* <p>
* This corresponds to equation 5.96 in Guochang Xu, GPS - Theory, Algorithms and Applications, Springer, 2007.
* </p>
* @author Luc Maisonobe
* @since 12.1
*/
public class Wang1988 implements WaterVaporPressureProvider {
/** Coefficients for the partial pressure of water vapor polynomial. */
private static final double[] E_COEFFICIENTS = {
-37.2465, 0.213166, -0.000256908
};
/** Conversion polynomial. */
private static final PolynomialFunction E_POLYNOMIAL = new PolynomialFunction(E_COEFFICIENTS);
/** {@inheritDoc} */
@Override
public double waterVaporPressure(final double p, final double t, final double rh) {
return TroposphericModelUtils.HECTO_PASCAL.toSI(rh * FastMath.exp(E_POLYNOMIAL.value(t)));
}
/** {@inheritDoc} */
@Override
public <T extends CalculusFieldElement<T>> T waterVaporPressure(final T p, final T t, final T rh) {
return TroposphericModelUtils.HECTO_PASCAL.toSI(rh.multiply(FastMath.exp(E_POLYNOMIAL.value(t))));
}
}