# A Heterogeneous Battlefield Situation Information Sharing Method Based on Content
## 1 Introduction
Following the idea of schema mapping, several studies for realizing heterogeneous battlefield situation information sharing have been done. Among them, the work in [8] used the XML schema as the uniform schema and designed battlefield situation information description models to realize information sharing, which mainly focused on the internal information of target elements, while the semantic relationships among them were less considered. With the development and wide application of ontology technology, the works in [9; 10; 11; 12] designed an ontology based information description model to realize schema mapping and produced several advances in realizing effective battlefield situation information sharing. The work in [9] focused on the sharing of battlefield target information; the work in [10] focused on the construction approach of a battlespace ontology based on OWL; the work in [11] focused on the method of realizing battlefield situation collaborative plotting based on ontology; the work in [12] focused on the method of realizing battlefield situational information discovery based on ontology. However, the dynamic and mission related property of the semantic relationships among target elements in the battlefield space are less concerned, but this reflects the dynamic evolution characteristic of the battlefield situation, which is important for commanders to master the real-time state of the battlefield and make decisions. In addition, the graph based organization method of represented information, which is usually used by traditional ontology based systems, is not conducive to improving the efficiency of information searching. In this paper, we propose a framework of realizing heterogeneous battlefield situation information sharing based on a unified battlefield situation information space. Combat units are the core description objects, and we design a general model to describe the information uniformly in an entity oriented way. To reflect the properties of being dynamic and mission related in semantic relationships, as well as to increase the efficiency of information searching, we organize the external information and the internal description information of entities with different strategies. The main contributions are as follows:* We propose an entity oriented description model of battlefield situation information to reflect the basic characteristics of target elements in the battlefield space, as well as the consistency of the heterogeneous battlefield situation information. * We design a concept-logic tree model to organize heterogeneous information in a consistent way, and a semantic link network is adopted to describe and organize the dynamic and mission related semantic relationships among entities. * We construct a heterogeneous information sharing framework based on a unified battlefield situation information space, which can realize heterogeneous information sharing among systems. * Theoretical analysis and experiment results show that the sharing of heterogeneous information among different systems can be realized effectively based on the information sharing framework we propose.