常规可控震源限定频谱高频拓展

常规可控震源因自身因素,工作频宽受到一定的限制。本文通过分析影响可控震源高频出力的关键因素,得出可控震源高频出力特性曲线,基于扫描功率谱和扫描信号频变速率的关系,得到一种限定频谱高频拓展扫描信号设计方法,并对此方法设计高频拓展信号进行了井下对比接收。该限定频谱高频拓展方法不影响其他频段的能量,高频段震源畸变小,具有进一步拓展可控震源高频极限频率的技术优势。

The method for high frequency sweep signal expanding on conventional vibrator

Due to its own design, the work frequency band-width of conventional vibrator is limited. In the paper through the analysis of the key factors affecting the vibrator high-frequency outputting,the characteristic curve can be got. Then based on the power spectral density relation to the signal＇s rate of frequency change, the paper provides a method to expand prescribed spectrum high-frequency sweep, and compares the high-frequency expand signal with a linear sweep. The prescribed spectrum high frequency expanding method proved to not sacrifice other frequency band energy any more, and the high frequency source distortion is also very small.