浅析军用认知无线电

认知无线电作为一种智能无线电技术,可赋予军用无线通信系统以电磁环境感知能力,有效解决战场频谱利用率和管理的问题,对军事通信产生了深远的影响.本文首先论述了军用认知无线电的现状,接着提出了军用认知无线电的定义,重点分析了军用认知无线电的特点和网络要求,最后对军用认知无线电面临的机遇和挑战作了简要展望.     

The research of mine rock burst hazard identification based on fault tree analysis

In order to identify the rock burst hazard in coalmine and thus to give a credible forecast, firstly, analyzed such effect factors as natural geological factors and mining technological conditions based on the investigation of more than one hundred mine rock burst cases. Secondly, adopted the fault tree analysis （FTA） technology to the mine rock burst hazard identification for the first time and confirmed twelve kinds of basic events, that is, the large mining depth, the burst-orientation coal seams, the solid strata of roof and bottom, near the faults with bigger fall, the folds, the change of seam thickness, other regional tectonics transformation or stress strip, the drilling, blasting and extracting operation, the unscientific extracting methods, the illogical extracting sequence, the residual pillars and the too close distance between the working face and the residual areas or the stopping extracting lines. Moreover, worked out the fault tree of mine rock burst. At last, it made qualitative analysis and quantitative analysis and forecasted the rock burst hazard according to the characteristic of geologic structure and exploitation technology conditions in certain mine of Shandong Province, China, the rock burst accidents happened in the following exploitation validated that it is of feasibility and veracity adopting FTA to identify the mine rock burst hazard.