改进的Burg最大熵法在管道检测中的应用

短时间序列、高分辨率、强抗噪能力的功率谱估计是管道超声内检测的关键技术.针对Burg最大熵法存在的问题,从减小递推算法初始阶段误差出发,提出二阶预测误差滤波器系数倒推法,由二阶滤波器系数修正一阶反射系数,保证递推初始阶段最大熵原则,以适应短时间序列谱估计,算法在管道内检测实验中得到了较好的结果.

The Application Of Improved Burg Maximum Entropy Method In Pipeline Inspection

Power entropy estimation what characterized short time serial, higher resolution and anti-noise was a key technology to inspect the inner wall of pipeline with ultrasonic. Aimed at the problem of Burg maximum entropy method, the coefficient backward deduction of the second order prediction error filter was put forward through reduced original recurrence arithmetic error. The method based on recurrence original maximum entropy is that the second order filter coefficient can modify the first order reflection coefficient in order to fit the estimation of short time serial. The test shows that the arithmetic is effective and useful.