PV measurement data format


#1

Hello, All.

I am newbi in orekit. I hope to know the file format for measurement data.

I can’t find the file format. Would you let me know the file format or any information?

Best regards,


#2

Can you elaborate little more?
Do you want to read PV file or output one?
Do you want to use this class?
https://www.orekit.org/static/apidocs/org/orekit/estimation/measurements/PV.html#<init>(org.orekit.time.AbsoluteDate,org.hipparchus.geometry.euclidean.threed.Vector3D,org.hipparchus.geometry.euclidean.threed.Vector3D,double[][],double,org.orekit.estimation.measurements.ObservableSatellite)


#3

Hello,

I am following the tutorial which is provided in orekit.

I hope to read PV measurement data from the file like the example.

My final goal is to determine the orbit from GPS navigation data.

Best regards,


#4

Can you link the tutorial?


#5

Hello,

I am showing this tutorial as the following link:


#6

The file used in the OrbitDetermination tutorial was made up for the sake of the tutorial. It is a simple columns oriented file. If you want to add PV measurements, you have to provide lines with the following fields:

field 1: date in ISO8601/CCSDS format
field 2: measurement type, PV for Position-Velocity
field 3: ground station, ignored for PV measurements, so could be replaced by “----”
fields 4, 5, 6: position in kilometers
fields 7, 8, 9: velocity in kilometers per seconds

Note that the tutorial has not (yet) be changed to handle position-only measurements, despite they
are available in Orekit 9.3 released a few days ago. It is however simple to add this and provide a
dedicated parser for such lines.