| With science, technology and communications experienced a rapid development,radio communications technology is also developing in the direction of globalization, the universal, diversification, high-speed, broadband and multimedia technologies,This also bring an increasing of the types of radio business, an fierce increasing amount of stations and the frequency resources that tightly lacks day by day. For the sake of management stations effective and make use of the limited frequency resources, we have to carry on the radio business completely, systematically and comprehensive. The Integrated Radio Management Platform (IRMP) is proposed under this situation. It bases on uniform, integrated, informative, comprehensive and normative database, realizes completely, systematically and comprehensive radio business analysis and business management.The Electricity Magnetism Compatible Analysis System (EMC), which implements interference analysis, coordinate calculation and frequency assignment of radio business, is an important part of IRMP. I am one of the core designers of the system and responsible for the dynamic link's tracking strategy part, simulation run part and calculation part. This paper is composed of seven chapters, divided into four parts. The first two chapters are the first part which introduces the topic background of the paper, system introduce, my work and some related technical knowledge in the system development. The third and fourth chapter is the second part which mainly introduces design framework, the architecture of the system and abstract design and implementation to the radio business model. The fifth and sixth chapters are the third part; this part introduces the design idea and concrete implementation of dynamic link's tracking strategy in detail, and detailed design and implementation of link's calculation and display module. In the end we summarize the design features and insufficiencies of the tracking strategy, and prospect the work in future. The first part introduces the topic background of this paper and some related knowledge. This part briefly introduces the background of the IRMP which is put forward and some related knowledge of EMC at first. Then introduces the significance of dynamic link and its tracking strategy in EMC. Dynamic link and its tracking strategy as an important component of EMC, its significance reflects in three aspects. First, with the tracking stations turnover constantly, so that with the geographic information has become more perfect combination. Second, as well as simulation run, the algorithm of tracking strategy select station optimized ,system amend the current information of all stations and make link calculation, all of these undoubtedly enhance the system design technically more difficult. Third, a tracking strategy that realized good or not will decide to the selection of tracking station, then impact on the quality of communication link, therefore, this is also the embodiment of the accuracy of link calculation. The following introduces the main work of this paper and related technology and technical difficulties in the system development. In this paper, the main work includes three aspects. First, radio model in particular links and tracking strategy designs and implement. Second, tracking strategy algorithm designs and implement. Third, simulation runs on the electronic map, result's calculation and display. Related technology and technical difficulties part introduces the problem of property and result display, sort algorithm which are used in strategy algorithm.The second part includes the system design, design and implementation of basic models module. This part introduces designed structure and architecture at first, then it focuses on the abstract modeling of radio's basic models, design class structure of models, design and implementation of the models, design and implementation of operated on the models. At the same time, it describes the process of the design and implementation of operated on the models and modeling which use separately the tracking strategy and the dynamic link as an example. This paper makes abstract model through models such as the station, the antenna, the carrier, the link and the tracking strategy in radio services, in turn the implement analog simulation of radio business.The third part includes the design and implementation of tracking strategy algorithm module and the design and implementation of calculation and display module. This part is the core of this paper. At first,tracking strategy algorithm module introduces the classification of tracking strategy algorithm, including the typical tracking strategy algorithm and the self-defined tracking strategy algorithm. The paper gives the classification of algorithm at well as give an extension of algorithm module architecture. The architecture divides into two layers, just as the abstract data layer and the actual calling layer which includes the implementation of algorithms. The following will introduces two kind of algorithm respectively. The typical tracking strategy algorithm includes constraint conditions such as tracking a particular station, constrained elevation, constrained distance, nearest, highest elevation and longest hold time. Compared with the typical tracking strategy, this paper designs a more flexible strategy which is called the self-defined tracking strategy. The design thinking of the self-defined tracking strategy is that it extracts each approach of the typical tracking strategy into an independent constraint condition and adds some commonly used constraint conditions which include elevation angle constraint, azimuth angle constraint, distance constraint, latitude difference constraint and longitude difference constraint. Then we can combine these conditions to compose more complex constraints to meet actual business needs. We also designed a way which sorts candidate tracking stations according to specific constraints conditions such as distance, elevation and azimuth, so it can meet stations of the designated "location" for the needs. In addition, we also design the handover options to meet special needs. The calculation and display module part briefly introduces the calculation of the link and its significance in EMC at first, then the paper introduces the design steps of the link calculation, the modeling and calculation of propagation model with ITU-R Recommendation P. 526-9 (2005) as an example. At last, the paper introduces the design and implementation of the simulation on electronic map as well as property and calculation results.The fourth part includes designed summary and prospects for the latter. The design of dynamic link and its tracking strategy in the system do the practical-oriented, extensible and easy to reuse as the main principles and the system implement tracking strategy algorithm for a number of commonly which are used to optimize and filter for tracking station (end station),at the same time, filtering algorithm based on custom options are implemented which pay more attention to the actual needs, set constraints according to the actual situation and reflects the humanization design concept. System will focus its work on GSO as well as non-GSO business in the future and design more suitable constraint conditions of tracking strategy as well as a fuller algorithm of tracking strategy to meet more demand of EMC. With the development of radio communications in our country, as well as the important position of Electricity Magnetism Compatible Analysis System in the radio communication business, the research of dynamic link's tracking strategy in EMC will has a certain significance in promoting for the development of radio technology in our country. |
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