angleMeasurement
Class AngleCalibration

java.lang.Object
  angleMeasurement.AngleCalibration

public class AngleCalibration
extends java.lang.Object

Class to sort out angle calibration data.
As for the Fluxgate 3030 calibration it's set so that 0 measured will still give 0 after calibration and all other values are relative to that.
Since there may not be an actual calibration point at 0, the whole calibration table need to be offset so that the first point is at 0.

Author:

Douglas Gillespie

Field Summary

private int	fitOffset
private int	fitOrder
private int	fitPoints
private double	maxError max error estimated over all angles.
private double[]	measuredValues values from angle measuring device.
private double[]	preparedFitOffsets
private double[][]	preparedFits pre prepared second order fits around each group of three points for use in calibration calculations
private Regressions	regressions
private double[]	sortedMeasuredValues sorted values from angle measuring device.
private double[]	sortedTrueValues sorted values measured from compass rose
private double[]	trueValues values measured from compass rose
private double[]	zeroedSortedTrueValues sorted true values which will give a fit of 0 out for0 in
private double	zeroTrue true angle for zero measured.

Constructor Summary

AngleCalibration(double[] trueValues, double[] measuredValues)

Method Summary

private void	checkMaxError() someone is sure to want to know what the max error is !
private double[]	extractFitValues(double[] dataArray, int startIndex)
private boolean	findZero() work out which true angle zero measured refers to.
double	getCalibratedAngle(double measured)
int	getClosestIndex(double[] searchArray, double searchValue)
double	getMaxError()
double[]	getMeasuredValues()
double[]	getSortedMeasuredValues()
double[]	getSortedTrueValues()
double[]	getTrueValues()
double	getZeroTrue()
private void	makeSimilar(double[] dataArray)
private void	makeSimilar(double[] dataArray, double targetValue) makes angles similar to some target value by adding and subtracting 360.
private double	makeSimilar(double dataValue, double targetValue)
void	setFitOrder(int fitOrder)
void	setMeasuredValues(double[] measuredValues)
void	setTrueValues(double[] trueValues)
private boolean	sortCalibrations() calibration values probably came in as an array of true points and an array of measuments.

Methods inherited from class java.lang.Object

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

Field Detail

trueValues

private double[] trueValues

values measured from compass rose

measuredValues

private double[] measuredValues

values from angle measuring device.

sortedTrueValues

private double[] sortedTrueValues

sorted values measured from compass rose

sortedMeasuredValues

private double[] sortedMeasuredValues

sorted values from angle measuring device.

zeroedSortedTrueValues

private double[] zeroedSortedTrueValues

sorted true values which will give a fit of 0 out for0 in

preparedFits

private double[][] preparedFits

pre prepared second order fits around each group of three points for use in calibration calculations

preparedFitOffsets

private double[] preparedFitOffsets

zeroTrue

private double zeroTrue

true angle for zero measured.

maxError

private double maxError

max error estimated over all angles.

regressions

private Regressions regressions

fitOrder

private int fitOrder

fitOffset

private int fitOffset

fitPoints

private int fitPoints

Constructor Detail

AngleCalibration

public AngleCalibration(double[] trueValues,
                        double[] measuredValues)

Method Detail

sortCalibrations

private boolean sortCalibrations()

calibration values probably came in as an array of true points and an array of measuments. We need to be able to inverse this.

getCalibratedAngle

public double getCalibratedAngle(double measured)

checkMaxError

private void checkMaxError()

someone is sure to want to know what the max error is !

getClosestIndex

public int getClosestIndex(double[] searchArray,
                           double searchValue)

findZero

private boolean findZero()

work out which true angle zero measured refers to.
uses quad fit, need to work out if zero is closest to the 0th or the last value.

extractFitValues

private double[] extractFitValues(double[] dataArray,
                                  int startIndex)

makeSimilar

private void makeSimilar(double[] dataArray,
                         double targetValue)

makes angles similar to some target value by adding and subtracting 360.
for instance if the target is 0, then angles will be between -180 and 180
if target is 180, angles will be between 0 and 360, etc.

Parameters:

dataArray -

targetValue -

makeSimilar

private double makeSimilar(double dataValue,
                           double targetValue)

makeSimilar

private void makeSimilar(double[] dataArray)

getMeasuredValues

public double[] getMeasuredValues()

setMeasuredValues

public void setMeasuredValues(double[] measuredValues)

getTrueValues

public double[] getTrueValues()

setTrueValues

public void setTrueValues(double[] trueValues)

getSortedMeasuredValues

public double[] getSortedMeasuredValues()

getSortedTrueValues

public double[] getSortedTrueValues()

getMaxError

public double getMaxError()

getZeroTrue

public double getZeroTrue()

setFitOrder

public void setFitOrder(int fitOrder)