Space-based Information System Research Articles

Research on the Development Strategy of Real-Time and Intelligent Space-Based Information Service System in China

Real-time and intelligent space-based information service system is a next-generation space-based system that integrates satellite communications, satellite navigation, and satellite remote sensing. It delivers space-based information to civil and military users as required in real time, relying on multi-load integration, multi-satellite collaboration, and interconnection between space and ground networks. This paper first analyzes the strategic requirements for real-time and intelligent space-based information services, then reviews the development status of satellite communications, satellite navigation, and satellite remote sensing in China and abroad, and summarizes the existing problems. Moreover, it expounds the basic concept, objectives, and technical architecture of the real-time and intelligent space-based information service system, and analyzes the relationship between this system and the existing (or planned) space-based information system, thus demonstrating its feasibility for construction. The real-time intelligent space-based information service system can be established through three steps and developed first locally, then regionally, and finally globally. This system should be incorporated into the overall planning for national science and technology development, and be constructed and shared mutually by civil and military parties. During the construction of this system, communicating and integration with existing and planned communications, navigation, and remote sensing satellites as well as with the ground communication systems should be strengthened.

Development Status and Future Prospect of Space-Based Information Systems in China

Development Status and Future Prospect of Space-Based Information Systems in China

Simulation and Evaluation of Real-Time and Intelligent Space-Based Information Service System of China

The real-time and intelligent space-based information service system is a next-generation space-based information system featuring multi-satellite coordination and multi-network interconnection. It will be widely used in satellite communications, navigation, and remote sensing. To support the top-level design and construction of the real-time and intelligent space-based information service system, this paper studies the modeling simulation and performance evaluation of the system, and analyzes the necessity, requirements, and development trends of system simulation and evaluation. The key technologies such as scalable and efficient distributed simulation, spatial-temporal dynamic evaluation, and systematic modeling are discussed, considering the characteristics of the system, such as dynamic time-varying, diverse business, and heterogeneity. Based on the design of the distributed simulation and evaluation system, the transmission support capabilities of different low-orbit communication satellite systems are compared and evaluated, taking high-resolution remote sensing as an example. The results show that during the remote sensing data transmission process, the OneWeb satellite constellation has smaller delay, less packet loss, and higher capacity and stability, owing to its dense coverage; however, its capacity per satellite is inferior to that of the Hongyun satellite constellation which has a smaller coverage density. This study can provide technical supports for the feasibility evaluation and construction of the real-time and intelligent space-based information service system.

СОЗДАНИЕ АРХИТЕКТУРЫ «РАСПРЕДЕЛЕННОГО СПУТНИКА» ДЛЯ НИЗКООРБИТАЛЬНЫХ ИНФОРМАЦИОННО-ТЕЛЕКОММУНИКАЦИОННЫХ СИСТЕМ НА ОСНОВЕ ГРУППИРОВКИ МИКРО- И НАНОСПУТНИКОВ

Presented are the results of an analysis of the growing interest in the use of low Earth orbits (up to 1500 km high) for the introduction and development of the Internet of things (Internet of Things - IoT). Industrial Internet of things (Industrial Internet of Things-IIoT). Internet of things for remote areas (Remote Internet of Things - RioT, for the purposes of scientific research and economic use of natural resources, control of the development and operation of infrastructure projects, the operation of territorially distributed industrial production, transport infrastructure. Factors significantly limiting the further introduction of micro and nano satellites are given. The authors proposed to resolve this contradiction on the basis of the developed concept of creating the architecture of a "distributed satellite". As an example, the article considers possible applications of the distributed satellite architecture in two segments of the space information systems market: remote sensing of the Earth and telecommunication systems. The application of the "distributed satellite" in radar systems with synthesized aperture (SAR-system) was considered taking into account the requirements of the operators of satellite SAR-systems and consumers of their information. It is shown. that the use of the "distributed satellite" architecture in SAR-systems also makes it possible to realize the technology of multi-static radar with a "soft" interference base (from 200 m to 1 km). The scheme of organization and interaction of the "distributed satellite" in the satellite-transmitter on the platform of the micro satellite, which is the core of the satellite cluster, and several satellites-receivers on the cube-sat platform is presented. The functions performed by the satellite-transmitter, the inter-satellite radio link and the satellite-receiver are considered in detail. The work of the "distributed satellite" is illustrated by the presented structural diagram of the SAR-system for remote sensing of the Earth, a version of the architecture of the low-orbit satellite communication system and the scheme for constructing a satellite system for the provision of IoT services. In conclusion, it is noted that the architecture of the "distributed satellite" makes it possible to effectively use satellites of the class of micro/nano satellite (cube-sat) to create complex space-based information and telecommunication systems

Research on the Resource Scheduling Architecture for Service-oriented Space-based Information Systems

On the basis of integrating each subsystem in topological structure, implementation function, operation mode and institutional mechanism, this paper has established a comprehensive service system which could manage various heterogeneous resources and handle kinds of complex missions within the architecture to carry out the research of the resource scheduling architecture for service-oriented space-based information system. Originally, this paper analyzes the characteristics of space-based information system from two aspects of diversity and dynamics. Based on the research, this paper studies the organizational structure of resource scheduling of space-based information system to realize the unified management and scheduling of service-oriented diversification resources following the sequence from resources to missions. Afterwards, this paper has proposed a resource scheduling mode for the service-oriented space-based information system to realize the mapping from resources to missions, and it also has used that mode to block differentiated user requirements and the dynamic changes of the system. In the end, the paper has put forward the implementation plan of the resource scheduling for service-oriented space-based information system, and it also provides a reference for the next construction of the space-based information system.

Space-based information service in Internet Plus Era

“Internet Plus” represents a new form of society that provides a vast platform for reform, innovation, and development. Given the continued integration of the Internet in many fields, Internet Plus is profoundly transforming and influencing a variety of traditional industries. Internet Plus has created conditions favorable for the transformation of earth observation and satellite navigation into an intelligent and real-time geospatial information service. The authors propose that in order to implement continuous, all-weather, all-terrain services for the specific purposes of each individual, it will be necessary to overcome the flaws in existing space-based information systems, such as limited regional coverage, slow response, and weak interoperability. Furthermore, to meet the Big Data Era’s geospatial information service requirements, an “Internet Plus Space-Based Information Service” system, intrinsically linked to ground Internet networks, will have to be constructed. With reference to the developments of aerospace information technology, this paper discusses three levels of the proposed structure of the Internet Plus space-based information service system and ideas for its implementation. Finally, in recognition of the demands facing the Internet Plus space-based information service system, the prospects for geomatics and important supporting technologies are examined.

Formal ontologies and strategic environmental assessment. A case study: the municipal land use plan of Genoa

In the field of environmental assessment methods and tools, the space-based information systems have increasing importance, due to their capacity to organize knowledge according both to the representation of the urban and regional spatial systems (land use, settlement dynamics, urban metabolism) and to the representation of environmental components, normally expressed through a set of indicators (critical factors, vulnerability, etc.). In environmental assessment, the complexity of the cognitive frameworks is a central issue. The problem to represent within a single logic information system sets of data referring to different phenomena onto a spatial dimension, can be usefully implemented through the use of formal ontologies. In the case of evaluation processes in which decisions about land use must be compared with the state of the environment and the potential environmental impacts (also in their spatial dimension), one is faced with the problem of extracting data from the base built for the representation of structured information systems that determine the environmental factors (localized) of the vulnerability of various environmental components. Similarly, the comparison between environmental spatial data and land use and zoning maps should be built on the same type of spatial and semantic logic. Useful tools that can tie together the environmental dimension with the land uses is a GIS methodology are those that are based on formal ontologies. Through this technique of conceptualization, it becomes possible to consider the environmental assessment as a single process.

Resources scheduling for data relay satellite with microwave and optical hybrid links based on improved niche genetic algorithm

The formation of the Space-based Information System with the technology of high performance optical inter-satellite communication and the realization of global seamless coverage and mobile terminal accessing are the necessary trend of the development of optical and microwave hybrid communication. Considering the resources, missions and restraints of data relay satellite optical and microwave hybrid links system, a model of hybrid links resources scheduling is established and a scheduling algorithm based on an improved niche genetic algorithm is put forwarded. According to the multi-user-satellite, multi-time-window, multi-class-antenna and a number of missions with priority weight, the scheduling schemes are generated randomly to begin with and evaluated with the fitness functions. To obtain an optimal scheduling result, an improved niche genetic algorithm is adopted to optimize the scheduling schemes. The simulation result reveals that a satisfactory result is obtained and the improved niche genetic algorithm has advantages in both efficiency and performance in a scenario including a relay satellite with 2 optical antennas and 1 microwave antenna for user satellites connection, 8 user satellites with 64 missions. The simulation indicates that the model and the optimization algorithm are suitable for multi-user, multi-mission and multi-class-antenna hybrid communication recourses scheduling problem.

Allocation of Space Network Accessing Resource Basing on Genetic Algorithm

The space network is a new generation technology of satellites information transmission. It is a fully space based information system which owns the abilities including information automatic connection and retransmission, multiple nodes interconnection. The accessing resource plays an important role in the nodes interconnection. How to efficiently allocate the limited resource of links in space network is an important research subject in this area. This article proposes an improved genetic algorithm to solve the problem. The predictable orbit parameters of satellites are used to optimize the algorithm. The simulation results show that the algorithm achieves a higher user access rate and a lower link switching rate.

Timeliness evaluation of task-oriented networked space-based information system

Timeliness evaluation of task-oriented networked space-based information system

Methods of investigating the characteristics of the background?object situation and a technology for using them to create and perfect space-based real-time information systems

It is crucial to develop models of the background?object situation in order to create space-based on-line observation systems. This paper presents methods and a process for the simulation modelling of objects and backgrounds, involving the integration of heterogeneous data. Examples of the combined observation of objects and backgrounds are considered for various spacebased information systems. It is shown that it is necessary to create specialized systems for studying various properties of objects and backgrounds, based on fundamentally new methods of remote probing and modern achievements in the control of spacecraft, guidance, and the tracking of rapid processes with enhanced accuracy.