In recent years, as a key support technology of big data, the software-defined network has been widely studied as a new network innovation architecture. This article introduces the technology of the space-ground integrated network and software-defined network in detail. It discusses the research progress of software-defined network (SDN) in the architecture of the space-ground integrated network and compares the advantages and disadvantages of single-layer controller deployment and multilayer controller deployment. Finally, through the analysis of the characteristics of the space-ground integrated network, consider the GEO satellite deploy master controller, part of the LEO satellite deploy from the controller, and multiple performance indicators for controller deployment issues, the controller deployment issues, through a variety of optimization algorithm of satellite number more LEO satellite experiment simulation controller.
Laser active imaging uses a pulsed laser to illuminate the target. Through imaging detection of the target's reflected light, more detailed information of the target can be obtained. It can be used in severe weather conditions, at night and in the light of fire or smoke to monitor the target and attitude measurement. This article introduces the working principle and research status of four active laser imaging methods, including commonly used point scanning imaging, continuous light imaging, fringe tube imaging and APD imaging.
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