[Richard G]

This won't work.

Active range is calculated (by a computer) by clocking the difference between active transmission, and the return signal. (sound speed*time/2=range).

The U.S. sub has no way of knowing the start time of the active transmission from the chinese transmiter.

I did work with a now declassified very low freq active sonar that worked between 2 ships. One ship xmitted, the other ship recieved the signal, but both ships were in close proximity to each other, and datalinked.