Ka-band dual-mode airborne broadband satellite communication system

Abstract

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, encryption and protocol processing, converts the IP data into intermediate frequency signals, and sends the intermediate frequency signals to the master station. The signal is converted into a Ka satellite radio frequency signal through a built-in Ka up-conversion module of the airborne phased-array antenna housing for emission; and the modulation-demodulation management unit receives a downlink Ka satellite radio frequency signal, the downlink Ka satellite radio frequency signal is converted into an intermediate frequency signal through a Ka down-conversion module arranged in the airborne phased-array antenna housing, the intermediate frequency signal is sent to the modulation-demodulation management unit to recover an IP data stream, the IP data stream is sent to an airborne user through a passenger cabin wireless local area network, and the communication service of the airborne Ka broadband satellite communication system is realized.

Description

technical field [0001] The invention relates to a Ka-band dual-mode airborne broadband satellite communication system, in particular to a Ka-band dual-mode civil aviation airborne broadband satellite communication system based on a flat panel phased array technology. Background technique [0002] Satellite communication has many advantages such as strong mobility, wide coverage, large transmission capacity, high reliability, and flexible networking, and has become one of the important means of modern wireless communication. Entering the 21st century, the satellite communication industry has ushered in a new round of innovation, development and upgrading, and has entered a new stage of systematic development and globalized services. The air-ground broadband mobile Internet has become an urgent demand of the civil aviation market. The available spectrum resources of satellite communications are very limited, and higher frequencies must be used to build a broadband network. I...

AI Technical Summary

Problems solved by technology

[0005] With the development of global aerial interconnection technology, in order to meet the needs of domestic and foreign markets in the future, it is necessary to require the airborne broadband satellite communication system to have multi-mode working capabilities, and most of the existing products reported so far are single-working mode

In addition, the antennas of the existing civil aviation airborne broadband satellite communication systems are mainly traditional mechanical antennas and variable inclination continuous section array antennas (VICTS). Among them, the traditional mechanical antennas mainly rely on horizontal and vertical mechanical servo systems Accurate star alignment, and the height of this servo structure is relatively large, which requires the installation of a large antenna dome; although the VICTS antenna no longer uses mechanical methods in the vertical plane, the thickness of the antenna is reduced, and the airflow characteristics are better, but the frequency of this type of antenna The range is narrow, and it needs to be constantly calibrated to adapt to frequency changes during use

At present, the independent research and development of the domestic airborne Ka broadband satellite communication system is basically in the prototype stage, and the system design structure is relatively complicated. Zhongtong mechanical antenna, large size, slow scanning speed, poor star alignment accuracy, heavy weight, etc. are the weaknesses of traditional mechanical antennas

Images