Ka-band dual-mode airborne broadband satellite communication system

The Ka-band dual-mode airborne broadband satellite communication system disclosed by the invention is wide in beam scanning range and high in satellite capturing speed, and is realized through the following technical scheme: an antenna control management unit performs information interaction with a modulation and demodulation management unit according to parameters input by an aircraft inertial navigation system, controls a beam tracking satellite alignment process and beam capturing, and performs satellite tracking and satellite capturing; the satellite is locked, forward channel and backward channel information is obtained, and satellite capturing and satellite alignment of the antenna are completed; the airborne phased-array antenna cooperates with the modulation and demodulation management unit to establish channel connection with a master station to complete network access, the modulation and demodulation management unit receives IP data from the access Internet, carries out framing, coding, modulation,