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In the formation process of a sonar array, position deviation between array elements is inevitable, and the sound-field coupling between array elements is strong under the close-packed condition, thus resulting in the amplitude and phase inconsistency between array elements. So it is necessary to carry out array online calibration after array formation. An anechoic pool in the lab can only be used to simulate free field in a certain frequency band, which is difficult to satisfy the need of low frequency underwater acoustic measurement. Therefore, the study in this paper focuses on the low frequency calibration problem of cylindrical array, and proposes a calibration method for array amplitude-phase consistency which combines holographic acoustic field reconstruction in finite space with matching search compensation. Based on the sound field separation technique of near-field acoustic holography (NAH) in finite space, the sound field in finite space was reconstructed firstly. Then, the amplitude-phase consistency search function was established with the sound field reconstruction results to realize the amplitude-phase consistency calibration for complex array elements by combining the optimization idea of matching search algorithm. In this paper, a small cylindrical array was taken as the analysis object, the theoretical modeling and simulation of the finite space sound field in the cylindrical cavity were carried out, and combined with intelligent optimization algorithm to calibrate the amplitude and phase consistency between array elements. The simulation results show that the proposed method based on NAH can be used for on-line calibration of low frequency amplitude-phase consistency after array formation in the laboratory.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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