A "progressive updating" method of large scale displacement measurement is proposed to avoid the defect of low correlation coefficient caused by large scale displacement.

同时还提出一种“逐步更新”的测量方法，它克服了由于大的位移而导致相关系数偏低的缺点。

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And if not using data correlation coefficient theory to determine whether there is defect in pipe, only using PSD particular frequency band storing method, the compression rate is extremely limited.

而如果没有数据相关度理论对数据进行预处理判断是否缺陷，功率谱特定频段数据保存法的压缩能力还是极其有限。

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