# Estimation Examples

## Estimation using simulated observations

In the following examples, observations are simulated and then used as input for a covariance analysis and/or estimation.

## Estimation using pseudo-observations data

In the following examples, Cartesian positions of bodies are taken from an external source and used as observations to which a Tudat dynamical model is fit.

## Estimation using real observations

In the following examples, real observations are used to fit the dynamics of spacecraft and/or natural bodies.