astro.calc
Class DeadReckoning

java.lang.Object
  |
  +--astro.calc.DeadReckoning

public class DeadReckoning

extends java.lang.Object

Astronomical Navigation Tools.
Dead Reckoning : Estimated Altitude et Azimuth.
This is a Java Bean.
Input parameters :

• GHA - Greenwich Hour Angle
• Declination
• Estimated Latitude
• Estimated Longitude

Output data :

• Estimated Altitude
• Azimuth

Test with :

• GHA = 321°57.9
• D = 13°57.5 N
• L = 46°38 N
• G = 4°06 W

Result should be

• Ea 42 02
• Z 119

This call only performs calculations. No user interface is provided.

Field Summary

static int	LOWER_LIMB
static int	UPPER_LIMB

Constructor Summary

DeadReckoning()
Constructor.

DeadReckoning(double dAHG, double dD, double dL, double dG)
Constructor.

Method Summary

void	calculate() Performs the required calculations, after the AHG, D, L and G.
double	correctedAltitude(double calculatedAltitude, double eyeHeight, double hp, double sd, int limb) Returns the corrected Altitude of a celestial body We left in stand by for now: Oblate Spheroid (Earth is not a sphere) Barometric Correction
java.lang.Double	getHe() Returns Hauteur estimée after calculation.
double	getHorizonDip()
double	getPa()
double	getRefr()
java.lang.Double	getZ() Returns Azimuth after calculation.
void	setAHG(double ahg) Set the AHG before calculation
void	setD(double d) Set the D before calculation
void	setG(double g) Set the G before calculation
void	setL(double l) Set the L before calculation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UPPER_LIMB

public static final int UPPER_LIMB

See Also:

Constant Field Values

LOWER_LIMB

public static final int LOWER_LIMB

See Also:

Constant Field Values

Constructor Detail

DeadReckoning

public DeadReckoning()

Constructor. Call it and then use getHe() and getZ() to retreive result.
Call after this one setAHG(), setD(), setL() and setG()

DeadReckoning

public DeadReckoning(double dAHG,
                     double dD,
                     double dL,
                     double dG)

Constructor. Call it and then use getHe() and getZ() to retreive result.

Parameters:

dAHG - Angle Horaire Greenwich

dD - Déclinaison

dL - Latitude estimée

dG - Longitude estimée

Method Detail

calculate

public void calculate()

Performs the required calculations, after the AHG, D, L and G. he and Z are after that ready to be retrieved.

getHe

public java.lang.Double getHe()

Returns Hauteur estimée after calculation. This value is decimal. Use GeomUtil.DecToSex(getHe()) to read it in DegMinSec.

See Also:

GeomUtil

getZ

public java.lang.Double getZ()

Returns Azimuth after calculation. This value is decimal. Use GeomUtil.DecToSex(getZ()) to read it in DegMinSec.

See Also:

GeomUtil

setAHG

public void setAHG(double ahg)

Set the AHG before calculation

Parameters:

ahg - the AHG to set

setD

public void setD(double d)

Set the D before calculation

Parameters:

d - the D to set

setL

public void setL(double l)

Set the L before calculation

setG

public void setG(double g)

Set the G before calculation

Parameters:

g - the G to set

getHorizonDip

public double getHorizonDip()

getRefr

public double getRefr()

getPa

public double getPa()

correctedAltitude

public double correctedAltitude(double calculatedAltitude,
                                double eyeHeight,
                                double hp,
                                double sd,
                                int limb)

Returns the corrected Altitude of a celestial body
We left in stand by for now:

• Oblate Spheroid (Earth is not a sphere)
• Barometric Correction

Parameters:

calculatedAltitude - The one you want to correct

eyeHeight - Height of the eye above water, in meters

hp - Horizontal parallax, in minutes

sd - Semi diameter of the celestial body, in minutes

limb - Upper or Lower limb

Returns:

the Corrected Altitude

See Also:

UPPER_LIMB, LOWER_LIMB