Design On Satellite Transmission Link In Airborne Real-Time Information Collection System

The airborne real-time information collection system is widely used in disaster monitoring, atmospheric study, meteorological observation, geological exploration, earth measurement, environmental protection, frontier patrol and antiterrorism action.In this paper, the author focuses on following researches:1.combined with characteristics of satellite link in airborne real-time information collection system, proof and design to forward link and backward link, including multiple access, carrier modulation, channel correction code and channel adaptation, are conducted.2.On forward link, the design, which is based on multi-carrier direct sequence spread spectrum and depression of narrow-band interferences, not only realizes a reliable information transmission under complicated electromagnetic condition, but also makes the control of one station to multiple devices easy.3.On backward link, the design, which is based on code modulation and self-adaptation, realizes a reliable and high efficient transmission, but also track changes in channel characteristics so as to adjust encoding modulation through reasonable frame design and accurate channel estimation, so that maximize the use of link power and bandwidth resource under the premise of reliable transmission.4.The author designed the prototype and demonstration system so that to prove the anti-narrowband-interference ability in forward link and the self-adaptive transmission ability in backward link.