How to check the orbit fitting residuals?

[Hanbing59]

Hello the GROOPS Community,

I am wondering how I could check the residuals of orbit fitting conducted by the program PreprocessingVariationalEquationOrbitFit.

Based on the documentation for program PreprocessingVariationalEquation:

The integrated orbit should be fitted to observations afterwards by the programs PreprocessingVariationalEquationOrbitFit and/or PreprocessingVariationalEquationSstFit. They apply a least squares adjustment by estimating some satellite parameters (e.g. an accelerometer bias). If the fitted orbit is too far away from the original inputfileOrbit the linearization may not be accurate enough. In this case PreprocessingVariationalEquation should be run again with the fitted orbit as inputfileOrbit and introducing the estimatedParameters as additional forces.

it seems that we are supposed to do a iterative processing with orbit integration (by PreprocessingVariationalEquation) and orbit fitting (by PreprocessingVariationalEquationOrbitFit), especially when we do not have accurate a-priori orbits for the satellites. And in this iterative processing procedure, the orbit fitting residual should be used as the criteria to justify the necessity of the next iteration. But it seems there is a no existed way to check the orbit fitting residuals from outputs of PreprocessingVariationalEquationOrbitFit.

Maybe I misunderstood some part of it. I appreciate any comments on this.

best regards,
hanbing