MeasurementBuilder.build method not working as expected

Orekit Python Wrapper usage
1

Hello,

On Orekit version 12 the signature for the build method has changed from:
build(SpacecraftState state)
to
build(AbsoluteDate date, Map <ObservableSatellite, OrekitStepInterpolator interpolators>

Since then, I have not been able to use this method because it returns the following error:
AttributeError: 'super' object has no attribute 'build'.
Which makes me believe there is a problem with the Python Wrapper.

An example follows:

from org.orekit.estimation import measurements
from org.orekit.estimation.measurements import generation

position_builder = generation.PositionBuilder(None, 1.0, 1.0, measurements.ObservableSatellite(0))
position_builder.build(spacecraft_state)

Additionally, this MR mentioned the restoring of the measurement builder API, but it doesn’t look to have solved the issue in Orekit 12.1. Shall I expect the SpacecraftState API to return soon?

Thank you in advance,

2

Hi,

The API has been restored, but it’s the python wrapper so some casting is needed. I’m guessing AbstractMeasurementBuilder is the right one?

Cheers,
Romain.

1 Like
3

Hi!

Apparently you should cast to the abstract class MeasurementBuilder. The following example should run:

from org.orekit.estimation import measurements
from org.orekit.estimation.measurements import generation

position_builder = generation.PositionBuilder(None, 1.0, 1.0, measurements.ObservableSatellite(0))
position = generation.MeasurementBuilder.cast_(position_builder)
position_builder.build(spacecraft_state.getDate(), spacecraft_state)

I am using the Python wrapper for version 12.1.1, so the signature of the build method is build(AbsoluteDate date, SpacecraftState[] states).

Regards,
André

3 Likes
4

It solved the issue, thanks!