Fig 1

Types of the coverage areas for BR"

Fig 2

Illustration of HMRDPs ${{\boldsymbol{P}}^{\boldsymbol{m}}}$ and ${\boldsymbol{F}}_{{\boldsymbol{ij}}}^{\boldsymbol{n}}$ "

Table 1

Symbols and descriptions"

Fig 3

Heterogeneous transmitters CN for ${\boldsymbol{F}}_{{\boldsymbol{ij}}}^{\boldsymbol{n}}\left( {{{\boldsymbol{T}}_{\boldsymbol{i}}} > {{\boldsymbol{T}}_{\boldsymbol{j}}}} \right)$ with ${\boldsymbol{l}}_{{\boldsymbol{\max}} }^{({\boldsymbol{i}})}{{ {\boldsymbol{=}} }} $ $ {\boldsymbol{3}}\;$ and ${\boldsymbol{l}}_{{\boldsymbol{\max}} }^{({\boldsymbol{j}})}{{ {\boldsymbol{= 1}}}}{{.{\boldsymbol{5}}}}$ "

Fig 4

Heterogeneous transmitters CD for ${\boldsymbol{F}}_{{\boldsymbol{ij}}}^{\boldsymbol{n}}\left( {{{\boldsymbol{T}}_{\boldsymbol{i}}} > {{\boldsymbol{T}}_{\boldsymbol{j}}}} \right)$ with ${\boldsymbol{l}}_{{\boldsymbol{\max}} }^{({\boldsymbol{i}})}{{{\boldsymbol{ =}} }} $ $ {\boldsymbol{3}}\;$ and ${\boldsymbol{l}}_{{\boldsymbol{\max}} }^{({\boldsymbol{j}})}{{ {\boldsymbol{= 1}}}}{{.{\boldsymbol{5}}}}$ "

Fig 5

Schematic diagram of the proof of Lemma1"

Fig 6

Diagram of MRN deployment problem"

Fig 7

Number of receivers in two HMRDPs"

Fig 8

Deployment location diagram"

Table 2

Parameters of the simulation experiment"

Fig 9

Relationship between the total length of arc barrier on land and deployment cost"

Fig 10

Relationship between the length of circular arc barrier and the number of sensors"

Fig 11

Cost difference between Scheme 1 and Scheme 2"

Table 3

Deployment positions of heterogeneous transmitters T1 and T2 in Scheme 1 "

Table 4

Deployment positions of heterogeneous transmitters T1 and T2 in Scheme 2 "

Table 5

Deployment parameters of Scheme 1 and Scheme 2"

Fig 12

Deployment diagram of two schemes"