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过去已有大量的文献研究过组合检波与多次复盖问题。但大多是分别研究其特性,并且强调多次复盖与组合检波的差异性多,而阐述二者一致性少。虽有个别文献谈到二者的类似性,但没能给出表征二者一致性的通用特性公式。本文将地震波看成脉冲波,将多次复盖与组合检波统一地当作一种脉冲干涉系统,从波的输入输出能量的变化分析了干涉系统的特性,给出了表示其特性的通用公式。将该公式具体应用到组合检波和多次复盖时,分析指出,多次复盖与组合检波对简谐波所表现出的“二次通放带”,在脉冲波情况下是不存在的。加大组内距或道间距不会使干扰波加强,而只会更好地削弱。组内距和道间距的最大值主要受需追踪的最浅反射层深度等限制。通用公式原则上也适用于类似的脉冲干涉系统。
In the past, a large number of literatures have studied combinatorial detection and multiple cover issues. However, most of them separately study their characteristics, and emphasize that there are many differences between multiple coverage and combined detection, but the two are less consistent. Although some articles talked about the similarities between the two, they failed to give a general formula for characterizing the consistency between the two. In this paper, the seismic wave is regarded as a pulse wave. The multi-cover and combination detection are regarded as a kind of impulsive interference system. The characteristics of the interference system are analyzed from the variation of the input and output energy of the wave, and the general formula . When this formula is applied to the combined detection and the multiple coverage, the analysis shows that the “double pass-band” exhibited by the multiple detection and the combined detection on the simple harmonic does not exist in the case of the pulse wave . Increasing the distance between groups or the spacing of the tracks will not intensify the interference waves and will only weaken them better. The maximum value of group spacing and channel spacing is mainly limited by the depth of the shallowest reflector to be traced. The general formula also applies in principle to similar impulse interference systems.