Recovery of Lost Target Using Target Tracking in Event Driven Clustered Wireless Sensor Network

Algorithm 2

Lost target recovery in WSHAN algorithm.

(1) If (target is in range of HBN) Then

(2)     Wake up all HBNs

(3)     Track the target till in reach (As the target becomes unreachable it is lost)

(4)     If (!in range) Then

       Initiate Recovery

(5)         If (target is in vicinity of three HBNs) Then

(6)             If (energy > τ)

(7)                 Become the CTN and Localize target with trilateration

(8)             End If

(9)             Send the target found message to previous tracking node

(10)        End If

(11)    End If

(12) Else If (!found target)

(13)    Call (KF/EKF/PF algorithm)

(14) End If