Source ranging using the dispersionless array invariant
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摘要: 针对传统阵不变量方法在低信噪比和远距离测距性能差的问题,提出了消频散阵不变量测距方法。该方法首先对垂直阵接收信号进行消频散波束形成,消除频散影响,压缩脉冲宽度,提高简正波到达时间分辨率;然后,对得到的角度-时间谱采用反卷积处理提高简正波俯仰角度分辨率。通过消频散和反卷积处理,减小了简正波相对到达时间和俯仰角在角度-时间谱图中的聚焦范围,有利于准确的提取阵不变量和估计目标声源的距离。计算机仿真证明了该方法在低信噪比条件下的鲁棒性;2009年崂山湾实验数据处理结果表明:相比于传统阵不变量测距方法,该方法距离估计误差减小2.5%。Abstract: To resolve the problem that the performance of the traditional array invariance method is degraded for ranging a long-distance source with low Signal-to-Noise Ratio(SNR),a Dispersionless Array Invariant Ranging method(D-AIR)is proposed.The dispersionless beamforming is firstly performed to the signals received by a vertical line array,which can eliminate the influence of the dispersion to compress the pulse width and improve the arrival time resolution of normal mode.Then,the angle-time spectrogram output is deconvoluted to improve the elevation angle resolution of the normal mode.The high resolutions of the relative arrival time and the elevation angle in the angle-time spectrogram are beneficial to extract the array invariant and then estimate the distance of the source accurately.The robustness of D-AIR in low SNR is verified by simulation and the Laoshan Bay experimental results show that the relative error of D-AIR is 2.5%less than the traditional array invariance ranging method.
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