Abstract:

Because the existing personnel positioning system is difficult to locate the personel position in mine accidents, a system based on double Mach-Zehnder interferometer structure is designed. The structure and positioning principles of the system is described, the positioning method of the system is easy to implement, with the advantages of a passive, flame-proof, anti-electromagnetic interference and remote control and so all, having great practical value. To improve the positioning accuracy of the system, combined with wavelet threshold noising features, a wavelet threshold noising cross-correlation delay estimation algorithm is preposed. The simulation results show that the algorithm can effectively improve the positioning accuracy of the system.

Key words: coal mining accident, rescue positioning, estimation of time delay, cross-correlation, signal tonoise ratio, positioning accuracy