The RS sequences have been chosen as a pseudo-random frequency hopping sequence, and the RS sequence production method has been introduced.

采用RS码作为构造跳频图案的伪随机序列，分析讨论了RS序列的产生方法。

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The random frequency agility and the random jitter of PRI may ensure the radar with strong abilities of anti-reconnaissance and anti-jamming.

随机频率捷变和脉冲重复周期随机抖动可以使雷达具有较强的抗侦察、抗干扰能力。

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MessageLabs, the email-filtering company that Symantec acquired in 2008, posted a set of word maps today measuring the frequency of terms in spam emails from a random one-week sampling of junk mail pulled from the most prolific spam-spewing botnets.

FORBES: The Most Common Words In Spam Email

Only a receiver programmed with the same random sequence would be able to follow the signal as it hopped from one frequency to another.

ECONOMIST: Player-piano pioneer

By changing the frequency of a radio transmission many times a second, causing it to leap around in an apparently random fashion, a radio signal could be made almost impossible to intercept.

ECONOMIST: Player-piano pioneer