It USES spread spectrum technology.

它使用扩频技术。

Proposes a new lossy robust spread spectrum watermark algorithm.

提出了一种新的无失真鲁棒扩频水印方法。

Spread spectrum has two distinct flavors: direct sequence and frequency hopping.

该技术有两个明显的变型：直接顺序与跳频。

There are several difficult problems in the research of spread spectrum FH/DS system.

在研制扩展频谱FH/DS系统时，会遇到一些很困难的问题。

The near field spread spectrum ranging algorithm based on software radio is investigated.

对基于软件无线电的近距离扩频测距算法进行了研究。