( h ) Research on and development of space environment forecasting systems for predicting sun flares ; ( i ) Research on and development of an airborne , two-frequency Doppler radar and a space-borne radar for the tropical rainfall measuring mission ( TRMM ) to observe global rainfall from outer space ; ( j ) Experiments for the precise measurement of crustal movement and rotation of the Earth using the very long baseline interferometer ( VLBI ) and satellite laser ranging systems .