The modern radar jamming and antijamming technology from airspace frequency domain and time domain, are introduced, and the methods despoiling information authority in modern war are analyzed.

分别从空域、频域、时域介绍了现代雷达干扰和抗干扰技术，分析了现代战争中夺取信息权的一些手段和方法。

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Weapon systems, communication systems and so on in the modern war send electromagnetic waves with different intensity and frequency, which are pollution to the space.

在现代战场中，武器系统、通讯系统和干扰系统等均会发射出强度、频率不同的电磁信号，这些电磁信号会对战场空间构成严重的电磁污染。

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While any period can experience various degrees of frequency and amplitude, the period from 1914 through the end of the Cold War is best characterized as high-frequency, low-amplitude conflict.

任何一个时期都具有不同程度的频度和烈度，从1941年到冷战这段时期最合适于用高频度，低烈度冲突来描述。

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Regarding the act of war, far from anti-military, Napolitano is instead properly skeptical of the frequency with which presidents take us into war.

FORBES: Book Review: Judge Andrew Napolitano's "It Is Dangerous To Be Right When The Government Is Wrong"

U.S. Patent No. 2, 292, 387 for a "Secret Communication System" was issued to Hedy Kiesler Markey and George Antheil in 1942. (Markey was the surname of a husband she had divorced in 1940.) The frequency-hopping technology was not put to use in World War II, but it was employed in 1962 during the blockade of Cuba.

WSJ: Book Review: Hedy's Folly