Communication Resource Management Technology In Space-ground Cooperative Reconnaissance Networks

The space-ground cooperative reconnaissance network is an innovative exploration that inte-grates distributed reconnaissance,coordinated signal processing,high-precision positioning,on-board computing,inter-satellite and inter-vehicle self-organizing networks technologies Moreover,this network transforms the traditional electronic reconnaissance system based on a single platform into a new one which is based on platform of cubic satellite forma-tion,supplemented ground vehicle or ship clusters,and employs distributed reconnaissance and coordinated processing.The space-ground cooperative reconnaissance network can ex-pand the scope of reconnaissance,increase the measurement aperture and baseline length,improve measurement accuracy,enhance anti-destruction and anti-jamming capability,im-prove task execution efficiency,and reduce logistics support.To obtain best performance for routing,power allocation,etc.,the dissertation conducts an in-depth study on the communi-cation resource management technologies in the space-ground cooperative reconnaissance network.There is uniqueness with the space-ground cooperative reconnaissance network as follows.Firstly,the topology of cubic satellite formation is time-varying.Secondly,the volume,weight,size,thermal control capability,attitude control capability,power supply and ener-gy reserve of its cubic satellite platform are all subject to very strict restrictions;Thirdly,the satellite nodes need to transmit high-rate radar reconnaissance data,and also exchange low-rate non-service traffic such as GNSS observation and network control information.Fourthly,the distributed MESH network architecture may cause the global network views observed by the nodes to be inconsistent,so that the advance reservation traffic may be blocked during the route execution phase;Moreover,when the cubic satellite formation in the system works in conjunction with the ground vehicle cluster in a common spatial space,same spectrum resource occupation may cause conflicts.Finally,massive raw reconnais-sance data acquired by reconnaissance cubic satellites needs to be hauled back to a ground data processing center through a data offloading link as much as possible.For these specific needs of transmission services and environmental constraints,it not only needs an overall scheme of the communication system which is capable of supporting the space-ground co-operative reconnaissance network,but also poses challenges to the communication resource management capabilities of it.Regarding to the causes and characteristics of these practical problems,the dissertation proposes targeted technical solutions and related algorithms,then verifies through simulations.The main contributions of the dissertation are as follows:1?A communication system scheme adapted to cubic satellite formation is proposed.Its features are summarized as follows.Firstly,it is an architecture compatible with high-rate service data and low-rate non-service data transmission mode simultaneously.Secondly,its antenna configuration method is capable of switching between omnidirectional low gain and directional high gain.Thirdly,it contains RF unit solution for antenna selection.Moreover,without increasing hardware resources of cubic satellites,a method for adjusting antenna alignment in data offloading satellite-ground link in combination with multi-antenna signal processing and cubic satellite attitude is provided.Through detailed design and engineer-ing,the design scheme of the communication system has been formed into a prototype and is applied to scientific research projects.Some laboratory tests and system demonstration verification results show that the overall function of the program is basically complete,the performance is reliable,and it has good adaptability to real task scenarios.2?Through the abstraction and system modeling of the application scenarios of the space-ground cooperative reconnaissance network,some routing requirements of the cubic satellite formation network are analyzed.According to the stage division of the routing workflow,the author analyzes the main factors affecting the quality of two types of routing requests,i.e.,the advance reservation and immediate reservation,in MESH networks and investigated the research status and mainstream algorithms.Basing on the detailed analysis of the mechanis-m of the advance reservation request blocking problem,the author proposes a load balancing minimum blocking probability routing algorithm.Moreover,by analyzing energy consump-tion problems in the routing process and its impact on the energy-constrained system,the author proposes an energy-balanced minimum blocking probability routing algorithm.Us-ing different network parameters,simulations are conducted for three routing algorithms.It can be seen from the simulation results that the energy-balanced minimum blocking proba-bility routing algorithm has better anti-blocking performance,and can also avoid excessive energy consumption of some network nodes and the whole network,which can be applied to the cubic satellite formation in the space-ground cooperative reconnaissance network.3?Aiming at the coexistence of satellite networks,vehicle networks and satellite-ground links in the space-ground cooperative reconnaissance network,power allocation problems in vehicular networks is studied from the perspective of energy-spectral efficiency tradeoff.By analyzing the relationship between spectral efficiency and energy efficiency performance under different vehicle density scenarios,a unified energy-spectral efficiency tradeoff metric is established.Based on the energy-spectral efficiency tradeoff metric,a power allocation strategy is proposed and analyzed to effectively manage the co-channel interference caused by spectrum reuse and obtain the balance of spectral efficiency and energy efficiency.