Post-Newtonian limitations on measurement of the PPN parameters caused by motion of gravitating bodies

We derive an explicit Lorentz-invariant solution of the Einstein and null geodesic equations for data processing of the time delay and ranging experiments in the gravitational field of moving gravitating bodies of the Solar system - the Sun and major planets. We discuss the general-relativistic interpretation of these experiments and the limitations imposed by motion of the massive bodies on measurement of the parameters gamma(PPN), beta(PPN) and delta(PPN) of the parametrized post-Newtonian (PPN) formalism.