Research And Implementation Of Node Localization And Routing Demonstration System In Land,Sea,Air And Space Integrated Network

In recent years,with the continuous expansion of human production and living areas,higher requirements have been put forward for the coverage of communication networks.In this context,the integrated communication network technology of land,sea,air and space has attracted more and more attention,which is the development trend of global communication network in the future.The integrated network management system of land,sea,air and space is an important basis for the realization of integrated communication technology,but currently there is a lack of integrated network management system of land,sea,air and space multilayer space with interoperability ability.On the other hand,the localization and routing of different spatial nodes is an important technology to realize the integrated communication network of land,sea,air and space.At present,geographic routing is the most commonly used technology in mobile ad hoc networks,but most geographic routing protocols are designed for two-dimensional nodes,and can not well support three-dimensional nodes.This paper will study the above problems in integrated communication of land,sea,air and space,and the main innovative work includes the following two aspects:Firstly,an integrated communication network demonstration system for land,sea,air and space is developed and designed.At present,the existing earth observation system needs multi-platform cooperative task planning and mutual cooperation,and the network data acquisition is slow,which cannot achieve the ideal real-time dynamic display effect in a short time.Moreover,there is a lack of integrated land-based,sea-based,air-based and space-based network management system with interoperability.In this paper,we will develop and design a set of integrated communication network demonstration system for land,sea,air and space.Four layers of virtual nodes will be used to replace the real nodes in the network.A large amount of 3D model data will be loaded in the integrated space,and 3D geographical coordinates such as longitude,latitude and altitude will be set for each dynamic node.According to the actual demand,the operation trajectory of virtual nodes can be planned in advance,and the location,running speed and direction of nodes can be adjusted to correspond to the actual distribution one by one.In addition,the software designs a series of auxiliary positioning and routing functions for virtual nodes,which is used to simulate the real land,sea,air and space integrated network architecture.Secondly,a Local Delaunay Triangulated Geographic Routing protocol-LDTGR is proposed based on the Delaunay triangulation principle,which is suitable for three-dimensional space.Routing void problem is an important problem in routing field of 3D communication networks.However,classical face-based geographic routing protocols,which use face-based routing to recover paths from routing holes,still have problems such as poor network performance and additional routing overhead.In this paper,the Delaunay triangulation principle is introduced to improve the traditional geographic routing protocol,and a local temporary destination node is selected by a certain angle coordinate system to jump out of the routing hole.A local Delaunay triangulation geographic routing protocol-LDTGR,is proposed.In this paper,two working modes of LDTGR protocol are described in detail,and the advantages of LDTGR protocol are analyzed.Finally,by comparing two key performance indicators,packet delivery rate and delivery delay,with GPSR(Greedy Perimeter Stateless Routing)on GG(Gabriel Graph)and MDT(Multihop Delaunay Triangulation)protocols,the simulation results verify the advantages of our scheme in network performance.Since the whole simulation is conducted in a two-dimensional network,LDTGR protocol,if in a three-dimensional network,data may be routed to the destination along more different paths than the GPSR on GG routing protocol,thus reducing the probability of data collision.Therefore,the packet delivery rate of LDTGR protocol in 3D network is higher than that in 2D network.