Abstract
Considering the environments and requirements of the UAV data link, this paper presents an adaptive information transmission method. When transmitting the remote control command data, spectrum spread system is used to improve reliabilityof the data link. When transmitting the high rate information such as videos and images, a three-processing-channel optimum strategyis used to improve the reliability in different channelconditions.Channel 1 is based on Gardner timing recovery and MCMA equalizer, Channel 2 is based on spread spectrum code recovery andMCMA equalizer, Channel 3 is based on Gardner timing recovery and carrier recovery.The strategy computes the confidence level of each process channel and chooses the best one as the output. Besides, the typical channel which the UAV encountered isanalyzed and modeled. Experiments show that this design can achieve good performancein complex environments.
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