  Two radio-science instruments have included into the Luna-Glob and
Luna-Resource projects in the frame of Russian Luna exploration program: the
lander's radio beacon and the orbiter's receiver. Three types of experiments
are planned: orbital doppler measurements, VLBI interferometry, and Same Beam
Interferometry (SBI). An accuracy of acceleration measurements in the
Lander-Orbiter experiment coud be about 3-10 mGal. VLBI and SBI measurements of
relative landers distancies with accuracy better than millimeters should give a
tool for a accuracy improvement in the following scientific tasks: precise
determination of orbital and rotational movement of the Earth and the Moon,
determination of mass distribution and internal movements in the Moon's
interior, check of general relativity effects.
