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

Algorithm 1

Lost target recovery in WSHUN algorithm.

(1) If  (!found target)  Then

(2)     search in past few locations if target is available

(3) Else

    Initiate Recovery

(4)     Predict next locations as few locations ahead

(5)     Wake up all SHNs around this location

(6)     If (Found by neighbouring nodes)

(7)         If (energy > τ)

(8)             Become the CTN and localize target with Trilateration

(9)         End if

(10)        Send target found message to previous tracking node

(11)    Else

(12)        Wake up all two hop nodes around this location

(13)        Repeat till target is found

(14)    End if

(15) End if