Abstract
We report results of the ground tests for the flight model of Relay Satellite Transponder (RSAT) which will provide global lunar gravity mapping by 4-way Doppler measurement using SELENE. Mass properties of Relay Satellite (Rstar) are measured and adjusted, which allows the estimation of attitude fluctuations. Systematic errors caused by the phase noise have been confirmed by 4-way linked tests with Rstar bus equipments.