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基于射线追踪方法的电离层点对点传播问题研究 被引量:1
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作者 李佳文 李慧敏 +1 位作者 郭立新 江晓丽 《电波科学学报》 CSCD 北大核心 2024年第1期91-99,共9页
短波通信和电离层斜向探测本质上都属于点对点传播问题,即固定收发站之间的传播问题,而点对点传播问题的本质是在发射点搜索出合适的仰角和方位角来实现射线的自动导引。射线追踪一直是研究高频波传播现象的工具,基于射线追踪的自导引... 短波通信和电离层斜向探测本质上都属于点对点传播问题,即固定收发站之间的传播问题,而点对点传播问题的本质是在发射点搜索出合适的仰角和方位角来实现射线的自动导引。射线追踪一直是研究高频波传播现象的工具,基于射线追踪的自导引技术可以实现点对点传播,但不同电离层模型对点对点传播的轨迹和精度会有影响。本文将基于数值射线追踪,利用牛顿自导引技术构建点对点传播模型,研究在分段准抛物(quasi parabolic segments,QPS)电离层模型以及国际参考电离层(International Reference Ionosphere,IRI)模型这两种不同电离层模型下点对点传播算法的稳健性和精确性问题。结果表明,在两种模型下本文算法均有较高的稳健性,但是QPS电离层模型下具有更快的运行速度,而IRI模型下有更高的精确性。 展开更多
关键词 电离层拟合 分段准抛物(QPS)模型 国际参考电离层(IRI)模型 射线追踪 自导引算法 点对点
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Simultaneous scheduling of machines and automated guided vehicles in flexible manufacturing systems using genetic algorithms 被引量:5
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作者 I.A.Chaudhry S.Mahmood M.Shami 《Journal of Central South University》 SCIE EI CAS 2011年第5期1473-1486,共14页
The problem of simultaneous scheduling of machines and vehicles in flexible manufacturing system (FMS) was addressed.A spreadsheet based genetic algorithm (GA) approach was presented to solve the problem.A domain inde... The problem of simultaneous scheduling of machines and vehicles in flexible manufacturing system (FMS) was addressed.A spreadsheet based genetic algorithm (GA) approach was presented to solve the problem.A domain independent general purpose GA was used,which was an add-in to the spreadsheet software.An adaptation of the propritary GA software was demonstrated to the problem of minimizing the total completion time or makespan for simultaneous scheduling of machines and vehicles in flexible manufacturing systems.Computational results are presented for a benchmark with 82 test problems,which have been constructed by other researchers.The achieved results are comparable to the previous approaches.The proposed approach can be also applied to other problems or objective functions without changing the GA routine or the spreadsheet model. 展开更多
关键词 automated guided vehicles (AGVs) SCHEDULING JOB-SHOP genetic algorithms flexible manufacturing system (FMS) SPREADSHEET
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