【摘要】 文章提出了海底电缆二次定位的一种新方法。该方法采用1000Hz频段的大功率低频声纳取代气枪阵列作为定位震源,其余部分按照初至波定位方法进行二次定位。通过分析初至波定位及声波定位2个突出问题在方法上的原因,认为气枪震源和声波应答器不适合作为海底电缆二次定位使用是产生这些问题的主要根源。文章针对应用新方法所需要的低频大功率声纳技术方法进行了讨论研究。低频声纳-初至波联合定位克服了目前所使用的初至波定位及声波定位的弊端,该方法具有技术及经济上的可行性。更多还原

【Abstract】 A method for second positioning of ocean bottom cable is demonstrated. This method uses first break positioning, but the positioning seismic-source, the air-gun is replaced by a high-power, low-frequency sonar which work at frequency band of 1000Hz. The paper points out that the main problems of first break positioning and acoustic positioning are caused by air-gun and transponder. The paper studies requirements of the low-frequency sonar for second positioning. The disadvantages of first break positioning and acoustic positioning can be solved easily by the new method.更多还原