Manual identification and automatic identification are two methods for identifying reflected signals at the same time. In the application is a complementary relationship, in general, the test results can be mutually corrected. The details are as follows:
When the bottom reflection signal (not necessarily the strongest reflection signal) is obvious, the artificial recognition of the reflection signal can avoid obvious interference signals, and the test result is stable, but it is inevitable to participate in human factors, bringing the objectivity of the test results. Influence; When the bottom reflection signal is not obvious, especially for the initial signal of the short column, the free vibration signal and the reflection signal are superimposed on each other, the artificial identification will be helpless. If the artificial identification is used, the scientific and objectivity will no longer exist.
Automatic recognition of reflected signals, the device integrates FFT, MEM, correlation analysis and other methods, automatic analysis of human factors is small, analysis is simple and fast. Automatic resolution, whether using superior frequency or related analysis, will reduce the recognition of strong interference signals. On the one hand, the device adopts the techniques of half-wave movement and amplitude-increasing processing to enhance the automatic recognition ability of the reflected signal at the bottom of the column. On the other hand, manual identification can be used to assist the analysis when necessary, thereby greatly improving the scientific and objective test results. Sex.