一种超大功率的无线电波发射技术，该技术通过聚集一道波束并加热那些区域将电离层的一些区域抬高。
A super-powerful radiowave-beaming technology that lifts areas of the ionosphere by focusing a beam and heating those areas.
许多天文学家对长期研究空中的特殊区域都很感兴趣，多波束接收器不提供这方面的特殊便利。
For many astronomers, interested in studying specific locations in the sky for extended periods of time, the multi-beam receiver offers no particular advantages.
所得数字结果表明，在波束的近轴区域内为获得同样的计算精度，近轴近似法所需要的计算机时间远小于复射线追综法的时间。
Numerical computations show that paraxial approximation gives almost the same accuracy in the paraxial region as complex ray method but spends much less computer time.
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