The complex ray theory provides a simple and useful approach to analyze the propagation and scattering of HF EM waves in various complicated environments.
复射线理论为高频电磁波在各种复杂环境中的传播和散射提供了一种简便而有效的分析方法。
I establish systematically the marketing strategy on electric power secondary Equipment for HF electric Corporation with modern marketing theory in this thesis.
本论文从HF电气集团公司(简称HF公司)的实际出发，结合现代市场营销学理论，系统地制定出HF公司电力二次设备市场营销战略。
In this paper, a DSP-based HF channel simulator within audio bandwidth is designed and implemented based on the concerned theory on the effects caused by the ionosphere in radio wave.
根据电离层影响无线电波传输的有关理论，本文设计并实现了一种基于DSP的话音带宽短波信道模拟器。
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