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136 Advances in Productive, Safe, and Responsible Coal Mining

Fig. 8.18 Detailed area of the COMMs network.

Fig. 8.19 Reduced COMMs network.

Locations along primary and secondary EWs were selected as inputs into the track-
ing simulation. This simulation interrogates the signal strength that is available from
all signal sources in the model. These values were calculated in the previous step as
well as a variation value in the form of a confidence interval. This average value and
confidence interval are used by a pseudorandom number generator that is capable of
outputting numbers that meet a prescribed statistical model. In this case, a uniform
distribution random model was picked and a sufficient number of random values were
made to show the randomness of the system, 250. COMMs will also output the header
and position files that are used by the tracking simulator. The tracking simulation will
then output a coordinate in X,Y pairs that are in mine coordinates. This means that for
an intersection in the mine (GTP), 250 signal strength estimates generate 250