基于可变分数时延的被动声基阵信号生成方法

A Passive Acoustic Arrays Signals Generation Method Based on Variable Fractional Delay

摘要:

声纳系统的开发设计需要大量的试验数据进行试验验证。为解决外场实测数据不足，无法充分验证声纳系统信号处理能力的问题，进一步提高声纳系统测试平台对被动声基阵接收信号建模的精度，本文在现有声纳系统测试平台的基础上，提出了一种基于三次样条插值法的Farrow结构可变分数时延(VFD，variable fractional delay)滤波器设计方法，用于生成高精度的声基阵接收信号。本文方法生成的被动声基阵接收信号与频域时延法相比连续谱成分和线谱成分的精度均有提高，同时本方法生成信号处理后结果与实测信号处理后结果具有一致性，验证了本方法的有效性。该改进算法预期可在声纳系统测试平台中应用，具有较高工程应用价值。

Abstract:

The development and design of sonar systems require a large amount of experimental data for verification. To address the issue of insufficient field-measured data, which hinders the full validation of the signal processing capabilities of sonar systems, and to further enhance the accuracy of passive array signal modeling in the sonar system test platform, this paper proposes a Farrow structure variable fractional delay (VFD) filter design method based on cubic spline interpolation on the basis of the existing sonar system test platform. This method is used to generate high-precision passive array received signals. Compared with the frequency-domain delay method, the continuous spectrum and line spectrum components of the passive array received signals generated by this method have higher accuracy. Meanwhile, the processing results of the signals generated by this method are consistent with those of the measured signals after processing, verifying the effectiveness of this method. This improved algorithm is expected to be applied in the sonar system test platform and has high engineering application value.