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Abstract

An environment measurement system according to the present invention is provided with a first unit comprising: a transmitter which is located undersea and transmits an acoustic wave in a designated direction a plurality of times; a first receiver which is located undersea and receives an acoustic wave reflected by a reflecting body at the sea surface or the seabed; a transmission direction setting unit which designates, to the transmitter, transmission directions specified in advance by a user, so as to cause the transmitter to transmit acoustic waves in the directions; a first necessary time measurement unit which, for each of the transmission directions, measures from the transmission and reception times of an acoustic wave a time necessary for the acoustic wave to return, as a necessary time, and outputs an average of the measured necessary time as an average necessary time for each of the transmission directions; a layer setting unit which partitions between the sea surface and the seabed into layers each extending horizontally, at intervals of preset distances; a simultaneous equations set-up unit which sets up simultaneous equations using the transmission directions, the necessary times and the layer thicknesses and taking average sound velocities in the respective layers as unknown variables; a simultaneous equations solving unit which solves the simultaneous equations; an initial parameter setting unit which sets initial values necessary for the simultaneous equations solving unit to solve the simultaneous equations, as parameter initial values; and a sound velocity profile output unit which creates a profile of sound velocities obtained by determining solutions acquired by the simultaneous equations solving unit to be average sound velocities in the respective layers and arranging the average sound velocities in the respective layers in order of depth, and outputs the profile.

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First Claim