[4/53-r1] Draft new Rec. ITU-R[4A/XO]: Sharing between feeder links for the mobile-satell. serv. & the aeronaut. radionav. serv. in the space-to-Earth direct. in the band 15.4-15.7 GHz & the protect. of the radio astronomy serv. in the band 15.35-15.4 GHz