本文全面扼要地介绍了国外现行的各种无线电导航定位系统，并就各系统的优缺点及今后的发展趋势进行评述。
Various radio navigation systems abroad are introduces in this paper. An overview on the advantage and disadvantage of these systems as well as the trend of development is also presented.
大气折射效应会引起无线电传播路径发生弯曲，使得无线电导航定位系统中测量到的距离与真实值有一定的误差。
Radio wave bending is caused by atmospheric refraction, which leads to the distance measured by radio navigation system different from the truth.
商业飞行执照要求更灵活的掌握无线电导航及全球定位系统。
A commercial pilot's license requires you to learn how to use more sophisticated radio navigation and global positioning systems (GPS).
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