Underwater multi-beam sounding system and method

Abstract

The invention discloses an underwater multi-beam sounding system and a detecting method thereof. The system comprises a microcomputer control system, and a sound wave emission system and a sound wave receiving and detecting system which are connected with the microcomputer control system. The sound wave emission system is provided with a plurality of single emission units, and each single emission unit comprises a plurality of transmitting transducers with different resonance frequencies. The invention also relates to an underwater multi-beam sounding method according to the system. Through two unique modes of 'frequency sweeping and frequency selecting' and 'frequency hopping and sounding', the sounding range resolution is improved by reducing the frequency hopping residence time, the sounding range is increased by increasing the frequency point number of the frequency hopping, and the problem of the contradiction between the range resolution and the sounding range in the single-frequency pulse sounding. The sounding system and the underwater multi-beam sounding method can effectively resist underwater acoustic channel frequency selectivity fading and complex environmental noise, can accurately estimate the first echo reaching time under each wave beam angle, and improve the underwater multi-beam sounding accuracy.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic detection, in particular to an underwater multi-beam detection system and method. Background technique [0002] Since the American scientist Fessenden manufactured the first echo sounder in the early 20th century, underwater acoustic echo sounding has gradually become the main method for measuring underwater topography. The traditional echo sounding method is consistent with the traditional ultrasonic ranging principle. First, the sending transducer emits sound waves vertically downward. The sound waves reach the bottom of the water and are reflected, and then the reflected echo reaches the receiving transducer to be received. According to the estimated delay τ of the echo obtained relative to the emitted sound wave, and the transmission speed of the sound wave in the water υ (known), the water depth is obtained Therefore, the focus of ultrasonic ranging and sounding is to estimate t...

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