org.orekit.estimation.measurements.gnss

Class IonosphereFreeCombination

java.lang.Object

org.orekit.estimation.measurements.gnss.AbstractDualFrequencyCombination

org.orekit.estimation.measurements.gnss.IonosphereFreeCombination

All Implemented Interfaces:

MeasurementCombination

public class IonosphereFreeCombination
extends AbstractDualFrequencyCombination

Ionosphere-free combination.

This combination removes the first order (up to 99.9%) ionospheric effect.

             f1² * m1 - f2² * m2
    mIF =  -----------------------
                  f1² - f2²
 

With:

• mIF: Ionosphere-free measurement.
• f1 : Frequency of the first measurement.
• m1 : First measurement.
• f2 : Frequency of the second measurement.
• m1 : Second measurement.

Ionosphere-free combination is a dual frequency combination. The two measurements shall have different frequencies but they must have the same MeasurementType.

Since:

10.1

Author:

Bryan Cazabonne

Method Summary

Modifier and Type	Method and Description
protected double	getCombinedFrequency(Frequency f1, Frequency f2) Get the combined frequency of two measurements.
protected double	getCombinedValue(double obs1, Frequency f1, double obs2, Frequency f2) Get the combined observed value of two measurements.

Methods inherited from class org.orekit.estimation.measurements.gnss.AbstractDualFrequencyCombination

combine, combine, getName

Methods inherited from class java.lang.Object

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

Method Detail

getCombinedValue

protected double getCombinedValue(double obs1,
                                  Frequency f1,
                                  double obs2,
                                  Frequency f2)

Get the combined observed value of two measurements.

Specified by:

getCombinedValue in class AbstractDualFrequencyCombination

Parameters:

obs1 - observed value of the first measurement

f1 - frequency of the first measurement

obs2 - observed value of the second measurement

f2 - frequency of the second measurement

Returns:

combined observed value

getCombinedFrequency

protected double getCombinedFrequency(Frequency f1,
                                      Frequency f2)

Get the combined frequency of two measurements.

Specified by:

getCombinedFrequency in class AbstractDualFrequencyCombination

Parameters:

f1 - frequency of the first measurement

f2 - frequency of the second measurement

Returns:

combined frequency in MHz