The Research On Heterogeneous Networking Technology In Aerospace

The aerospace communication system of China is mutually independent at present. This results in a waste of resource, and a lack of QoS to support comprehensive and real-time application on various aerospace communication platforms. An effective mean to solve this problem is to proceed aerospace networking.First of all, this thesis researches heterogeneous links of aerospace, points out the problems of the present aerospace networking, raises the requirements of uniform access for heterogeneous links, and design a new system architecture for aerospace network. This proposal adds two kinds of nodes to the aerospace network, which named aerospace base station and heterogeneous access convergence server, without changing the original nodes. This proposal maintains compatibility and expansibility of the aerospace network.Subsequently, this thesis puts forward the self-adaption method for heterogeneous protocols and links, and the method of uniform bearer for heterogeneous access and convergence. Based on these methods, the "LLC over Multiple IP Tunnels" technology is adopted to improve reliability and provide QoS for some particular applications.However, due to the dynamic topology of aerospace, this thesis refers to the routing protocols of self-organized network, considers the situation of aerospace networking scene, and puts forward a multipath routing algorithm based on the quality of aerospace heterogeneous links, which will improve the networking and transmission efficiency significantly.Finally, this thesis builds up a system level simulation platform for aerospace networking, evaluates the performance of different networking schemes in different scenes. The result indicates that the proposal enables the interconnection among heterogeneous communication facilities, makes full use of frequency spectrum and space resource, shortens the communication distance, and extends coverage. The multipath routing algorithm based on the quality of aerospace heterogeneous links will keep the connectivity, avoid handover and transfer over multipath concurrently, which will guarantee not only reliability but also efficiency of aerospace networking.