A simple inertial or Doppler navigation has a common defect that position errors are always increasing with flight time or distance, therefore an external reference system is necessary.
Wavelet analysis and neural networks combine together, can examining the position and size of the hole defect, achieving wood defect quantitative testing.
小波包分解和神经网络相结合，能够检测孔洞缺陷的大小和位置，较好的实现了木材孔洞缺陷的定量检测。
3
The defect of" the possible world" with the position of moumenon leads to the thought of" the possible world" without the position of moumenon.