Application of Multiparameter Kalman Filter in Ultrasonic Water Meter

Table 3

Comparison of flow velocity and temperature before and after filtering and error analysis.

Flow velocity				Temperature
Before filtering	After filtering	Error	Error analysis (%)	Before filtering	After filtering	Error	Error analysis (%)
10	10	0.00	0	25	25	0.00	0
10.2	10.0264	0.17	1.70	25.3	25.0149	0.29	1.13
10.1	10.0348	0.07	0.65	25.5	25.0377	0.46	1.81
9.8	9.9954	-0.20	-1.99	24.9	25.0301	-0.13	-0.52
10.2	10.0322	0.17	1.65	25.3	25.0435	0.26	1.01
10.1	10.0449	0.06	0.55	25.1	25.0463	0.05	0.21
10.2	10.0579	0.14	1.39	25.3	25.0491	0.25	0.99
10.1	10.0661	0.03	0.33	25.2	25.0565	0.14	0.57
10	10.0531	-0.05	-0.53	25	25.0537	-0.05	-0.21