From: Centroid Localization of Uncooperative Nodes in Wireless Networks Using a Relative Span Weighting Method
Node density (nodes per  m)
Frequency and shadowing
 GHz
 dBm
0.25
2
4
0.50
3
7
0.75
11
1
5
15
30
17
45
23
60
29
75
6
35
91
40
106
8
46
121
9
52
136
10
58
151