PURPOSE: To calculate the detection distance in a sea bottom reverberation control area at every depth by one calculation in a estimate calculation processor for the estimate calculation of the detection distance of a sonar device. ;CONSTITUTION: A transmission loss and incident supplement calculation part 2 calculates transmission losses and incident supplements at every sampling points of a definite distance intervals along the sound rays set at every dips of a definite interval from the transmitter of a sonar device on the basis of the sonar various data, environmental conditions and calculation range inputted in an input part 1 and a transmission loss average calculation part 3 calculates the average value of transmission losses in respective lattice units obtained when an indicated sea area is divided in a horizontal direction and a depth direction and an incident dip average calculation part 4 calculates the average value of incident supplements in respective lattice units. A signal excess calculation part 5 calculates signal excess values in respective lattice units on the basis of the data inputted in an input part 1, the average value of transmission losses and the sea bottom scattering intensity value in a sea bottom scattering intensity register part 6 corresponding to the average value of incident supplements and a detection distance calculation part 7 calculates the detection distance in the sea bottom reverberation control area at every lattice depths on the basis of the calculated signal excess values of every lattices to display the same on a display part 8.;COPYRIGHT: (C)1994,JPO&Japio
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