[Retracted] Optimal Defect Detection and Sensing System of Railway Tunnel Radar considering Multisensor System Combined with Active Interference Suppression Algorithm

Table 3

First wave signal position table.

Number	First wave signal position (ns)	Mean difference (ns)	Maximum difference (ns)	Minimum difference (ns)
1	3.9	−0.23	0.22	−0.18
2	3	0.09	0.28	−0.32
3	3.16	0.17	0.16	−0.11
4	3.18	0.14	0.14	−0.11
5	3.71	0.09	0.13	−0.16
6	3.83	−0.12	0.22	−0.05
7	3.34	−0.17	0.07	−0.24
8	3.83	0.27	0.19	−0.11
9	3.66	0.18	0.11	−0.15
10	3.78	0.21	0.14	−0.12