Up to this time, there are two kinds of the passive ranging system. One thing is the seabed mounted transponders method and another is the float buoy ranging method. Both methods use the vessel-mounted pinger system. But when we need to estimate the running ability of the underwater vehicle easily and economically, we can't use the expensive vessel-mounted pinger system. So we must tract down the running locus of the underwater vehicle from the radiated noise of the vehicle.
In this study, we investigated the new passive ranging system which located the moving target. Then we computed the time-delay difference based on the output of a cross-correlter between two radiated noise signals received by the acoustic sensors and we solved three-dimensional equations for the acoustic velocity and these sensor's coordinates positions to tract down the running locus of the underwater vehicle.
In this paper, we verified an algorithm for the new passive ranging system by a simulation analysis, in which the radiated noise, the velocity and advance direction of the underwater vehicle are assumed.
The simulation analysis cleared the effectiveness of an algorithm of the new passive ranging system to determine the accurate position of the underwater vehicle.
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