Measurements multiplexer
Kalman filter process measurements one at a time. When several measurements are performed at the same time it ends up looping, using propagation with duration zero, and adjusting the estimated parameters progressively, with a result that depends on the order of measurements and possible observability problems.
We should add a measurement multiplexer that allow to gather all measurements occurring at the same time and present it to the Orbit Determination process as one measurement with a dimension equal to the sum of the individual measurements dimensions.
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