Correlation of Reflected signals in simulink

Hi Everyone, I am new to Simulink, and I am working on an SSTDR experiment. In this experiment, a PN sequence is transmitted to a wire, and the reflection from the end of the wire is received. The time delay of the reflection gives the length of the wire.

Now, my question is how do I use correlation in simulink to determine the time delay between the two signals. The transmitted and the reflected signals are shown in the picture. Thank You.

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