Measurement device of underwater sound signal transmit time and measurement method thereof

Abstract

The invention discloses a measurement device of the underwater sound signal transmit time and a measurement method thereof and relates to the distance measurement and positioning in a limited space liquid yield environment. The method comprises the following steps: a first m-sequence generator generates an m-sequence; a first signal generator generates a first carrier signal, the m-sequence is used to modulate the first carrier signal and obtain a first modulation signal, the output and amplified modulation signal drives a transmitter underwater acoustic transducer to emit an underwater sound signal and also emit a synchronizing signal at the same time to trigger a signal collection circuit to work; a second m-sequence generator generates another m-sequence; a second signal generator generates a second carrier signal which is the same as the first carrier signal, the m-sequence is used to modulate the second carrier signal and obtain a second modulation signal; a receiver underwater acoustic transducer receives the underwater sound signal; the signal collection circuit processes the underwater sound signal; and a computer performs calculation to the second modulation signal and the treated signal to obtain the underwater sound signal transmit time. By adopting the method, the measurement accuracy of the transmit time can be increased.

Description

technical field [0001] The invention relates to distance measurement and positioning in a liquid field environment in a limited space, in particular to a measuring device and a measuring method for the transit time of an underwater acoustic signal. Background technique [0002] The underwater acoustic local positioning system in a limited space liquid field environment has many applications in sewage treatment, liquid environment detection, and underwater target tracking. It provides position information for information detection in a liquid environment. In recent years, it has received a lot of research and attention. focus on. The limited space liquid field refers to the environment with limited space and filled with liquid substances. In this environment, it is often necessary to understand the environmental information. The general method is to put detection sensors with different functions into the liquid field for parameter detection. , and for harsh environments such...

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Problems solved by technology

[0022] The threshold method and the curve fitting method are very sensitive to noise, and the measurement effect is unstable. The cross-correlation method greatly reduces the measurement performance in the presence of multipath and reverberation.

There is no effective method for measuring the transit time of underwater acoustic signals in a limited space liquid environment with serious multipath and reverberation

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