常规可控震源都是采用瞬时频率随时间线性变化的扫描信号。
All the conventional vibrators use the sweep signal of which the instantaneous frequency shows linear change with time.
介绍了利用直接数字合成技术产生频率扫描信号的新方法。
A novel method of direct digital synthesizing frequency sweep signal is presented.
扫描采样率对成像质量至关重要，可通过驱动信号的频率选择和图像采集时间的设定来控制。
The scanning sampling density crucial to imaging quality can be deliberately controlled by setting of the driving frequencies as well as fetching duration.
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