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Table 1 Packets are grouped at the second “observation time”

From: UWSNs positioning technology based on iterative optimization and data position correction

Observation node ID Observed database Location data Observed time First received ID First received time
4 (58, 34) 2 1 2.0072
4 (58, 34) 2 2 2.0023
4 (58, 34) 2 3 2.0056
5 (41, 40) 2 3 2.0076
6 (42, 30) 2 7 2.0035
7 (38, 37) 2 8 2.0066
8 (40, 28) 2 6 2.0039
9 (51, 27) 2 1 2.0067
9 (51, 27) 2 2 2.0071
9 (51, 27) 2 4 2.0078
9 (51, 27) 2 6 2.0056
9 (51, 27) 2 8 2.0023