Purpose: to determine the propagation time of the acoustic signal between the objects separated by aqueous medium. The purpose of the invention -extension di- apazone defined by the propagation time of the acoustic signal between Neuilly objects while reducing the absorbed power. The method comprises transmitting a sonar signal A from the first object to the second, receiving sonar signal on the second object, transmitting hydroacoustic signal B from the second object to the first, receiving sonar signal B on the first object, measuring the time of sending sonar signal A and received sonar signal B on the first object. And also in use as a sonar signals A and B sequences numbered codewords, each of which consists of a sequence of code elements; is propelling sonar equivalents information quanta of a clock period TI, in memorizing the first and second object images codewords hydroacoustic signals B and A respectively, and receiving sonar signals comprises determining temporal boundaries periods T arrival chip regeneration within specified periods T of said chip in determining the numbers on the second object to the recovered codeword sonar signals a, completely coincides with its image , In the definition of the object in the first chamber M regenerated codeword sonar B, fully matched with its image signal, determining a reception time on the nerve object sonar signal B of said full scale matching between the latter. In a first aspect, there is a control unit 1, a transmitter 2, a receiver 3 of acoustic signals, the meter slot 4, generator 5, the direct signal, the echo of the reference sensor 6, the comparator 7, 8 meter symbol boundary position, the regenerator 9 symbols calculator 10. The second entity comprises a receiver and a transmitter of acoustic signals of the reference sensor the direct signal, the comparison block generator of the echo signal, measuring the position of symbol boundary, characters regenerator. S.p.f 2 BACKGROUND 3-yl. I ate with from 00 to 00 of 00
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