Multiple linear array combined acoustic array with super broad cover directivity

Abstract

This invention provides a kind of multi-linear array combination sound array has over-square overlay directivity. Each combination sound vibration includes N,N is greater than or equal to two emission linear array and a receive linear array, each linear array is compose of a group of sensor in symmetrical space, the N emission linear array are set in parallel, the normal direction of each emission linear array radiant surface forms a certain angle alphan with the normal direction of combination sound array surface, n=1,2,Lambada,N, the receive linear array and the emission linear array are plumb. This invention realizes the over-square overlay directivity of sound array by using multi-linear array, the technology is simple, the cost is low, its weight is light.

Description

(1) Technical field [0001] The invention relates to a measuring device, in particular to an acoustic array. (2) Background technology [0002] The multi-beam bathymetry system is currently one of the most important devices used to obtain underwater terrain information. Wide coverage measurement is one of the most important performance indicators of the system. It determines the efficiency of surveying and mapping, thereby affecting the surveying cycle and cost. The working principle of the multi-beam bathymetry system is to use the acoustic array to transmit and receive ultrasonic detection pulse signals, and use signal processing methods to estimate the topography and even landform information of the seabed based on the received underwater scattered acoustic signals. The most critical point for the multi-beam sounding system to achieve ultra-wide coverage measurement is the directivity of the acoustic array, and the measurement index of ultra-wide coverage corresponds to th...

AI Technical Summary

Problems solved by technology

Among them: (1) the disadvantages are no pitch compensation, low ping rate, and complex real-time roll compensation for receiving beamforming, such as SeaBeaml185; (2) the disadvantages are no pitch compensation, complex array technology, such as EM950; (3 The disadvantage of ) is that the emission directivity is difficult to be ultra-wide, such as SeaBat8125; the disadvantage of (4) is that a single line array emits, and there is a contradiction between the system index "coverage sector" and "detection distance", such as SeaBat8111; the disadvantage of (5) is The basic array has complex process, large size and high cost, such as Fansweep Coastal; (6) has the disadvantage of low resolution of the receiving array, such as Fansweep 20; (7) has the same disadvantages as (4), such as EM3000

And the above-mentioned several kinds of sound-based arrays, except (5) and (6), also have a common shortcoming: with the widening of the covering sector, the detection sound wave energy emitted by the sound-based arrays also weakens, which is not only unfavorable Echo time-varying gain control (TVG), and it adds difficulty to the system to achieve ultra-wide coverage detection

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