Table 1.

Comparison of average relative errors (unit: %).

Data	Traditional RFID technology	Coil sensor	General fusion	Improve fusion
1	8.52	6.27	0.97	0.97
2	10.04	4.93	7.23	4.6
3	9.56	5.78	5.72	2.74
Average	9.37	5.66	4.64	2.77