三维MUSIC近场噪声源识别算法仿真

为了识别三维空间内的噪声源,推导了三维MUSIC近场噪声源识别算法。在LabVIEW里进行三维MUSIC近场噪声源识别算法的仿真,仿真结果验证了该算法的有效性。针对三维MUSIC算法空间搜索计算量大的缺点,提出了改进的搜索方法:先设搜索半径为定值进行二维MUSIC谱搜索,得到噪声源的方向参数;然后确定2个方向参数进行一维MUSIC谱搜索,得到噪声源的半径参数;最后在前2次搜索确定的空间位置附近进行小范围的三维MUSIC谱搜索。改进的搜索方法使空间计算量大大减少的同时精度可以得到保证。

3D MUSIC near-field noise source identification algorithm simulation

In order to identify the noise source in three-dimensional space,this paper put forward the 3D MUSIC near-field noise source identification algorithm.The algorithm was simulated in LabVIEW.The result shows that this algorithm is effective.But 3D MUSIC algorithm has to search three-dimensional space,and it creates a large amount of calculation.An improved search method is proposed in this paper.The method is as follows：At First set a given value to radius and searches the peak of 2D MUSIC spectrum so we can get two direction parameters of the noise source.Then fix the two direction parameters and search the peak of 1D MUSIC spectrum so we can get the radius parameter.Finally make a small scale 3D MUSIC spectrum search around the position determined by previous two searches.The improved search method makes calculation greatly reduced while accuracy can be guaranteed.