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提出一种在有限空间中小尺寸矢量阵的低频工作段测试与校正技术.在低频测试技术的建立中,引入瞬态段信号以消除有限空间内的多途作用。同时,考虑矢量阵特性下的偏心旋转效应,建立有限空间中的小尺寸矢量阵的阵列流形及其校正方法,在理论上保证基阵误差与被测环境的独立性。然后根据仿真计算与水池实测结果分析瞬态段信号作为校正测量信号的有效性,验证校正模型的合理性与优势。最后通过小尺寸基阵多极子指向性的实现情况给出本文有限空间测量技术的可靠性。结果表明,本文所提技术可有效避免有界空间中的多途影响,实现小尺寸矢量阵的低频测量,为水下小尺寸矢量阵的后续应用提供可靠依据。
A low-frequency test and calibration technique of low-frequency vector array in a limited space is proposed. In the establishment of low-frequency test technique, the transient signal is introduced to eliminate the multi-path effect in the limited space. At the same time, considering the eccentric rotation effect under the characteristics of vector array, an array manifold of small-size vector matrix in finite space and its correction method are established, which theoretically guarantee the independence of the array error and the measured environment. Then according to the simulation calculation and the measured results of the pool, the transient signal is analyzed as the validity of the calibration measurement signal to verify the rationality and advantage of the calibration model. Finally, the reliability of the finite-space measurement technique in this paper is given through the realization of multipole directivity of small-size array. The results show that the proposed technique can effectively avoid the multi-pass influence in the bounded space and realize the low-frequency measurement of the small-size vector array, thus providing a reliable basis for the subsequent application of the underwater small-size vector array.