“null reference system”的概念、定义、翻译、参考文献-科学参考

单词	null reference system
释义	null reference system [`nǝl `ref·rǝns ´sis·tǝm] ^NAVIGATION A type of instrument landing system in which the antenna array consists of two elements, one twice as high as the other; the lower element radiates with maximum intensity along the glide path, while the upper element produces a signal null at the glide path angle.
随便看	shrink rule shrink wrapping shroud shrouded propeller shrub shrub-coppice dune Shubnikov-de Haas effect Shubnikov groups shuga shungite shunt shunt-excited shunt-excited antenna shunt-fed vertical antenna shunt feed shunt generator shunting shunt loading shunt motor shunt neutralization shunt peaking shunt reactor shunt regulator shunt repeater shunt T junction

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