为提高空间相关噪声场中的目标方位估计性能，提出一种基于空时相关阵联合块对角化的子空间方位估计算法．具体利用Jacobi旋转矩阵法对一组空时相关阵联合近似对角化，用联合对角化特征向量矩阵和特征值修正MUSIC（Multiple Signal Clas...为提高空间相关噪声场中的目标方位估计性能，提出一种基于空时相关阵联合块对角化的子空间方位估计算法．具体利用Jacobi旋转矩阵法对一组空时相关阵联合近似对角化，用联合对角化特征向量矩阵和特征值修正MUSIC（Multiple Signal Classification）等子空间算法。理论和仿真结果表明，在非相关噪声场中，基于联合对角化的子空间算法性能与常规子空间算法基本一致：而在相关噪声场中，联合对角化特征向量法能显著减小方位估计方差，提高估计性能。展开更多
Spatial correlation of sound pressure and particle velocity of the surface noise in horizontally stratified media was demonstrated, with directional noise sources uniformly distributed on the ocean surface. In the eva...Spatial correlation of sound pressure and particle velocity of the surface noise in horizontally stratified media was demonstrated, with directional noise sources uniformly distributed on the ocean surface. In the evaluation of particle velocity, plane wave approximation was applied to each incident ray. Due to the equivalence of the sound source correlation property and its directivity, solutions for the spatial correlation of the field were transformed into the integration of the coherent function generated by a single directional source. As a typical horizontally stratified media, surface noise in a perfect waveguide was investigated. Correlation coefficients given by normal mode and geometric models show satisfactory agreement. Also, the normalized covariance between sound pressure and the vertical component of particle velocity is proportional to acoustic absorption coefficient, while that of the surface noise in semi-infinitely homogeneous space is zero.展开更多
文摘为提高空间相关噪声场中的目标方位估计性能，提出一种基于空时相关阵联合块对角化的子空间方位估计算法．具体利用Jacobi旋转矩阵法对一组空时相关阵联合近似对角化，用联合对角化特征向量矩阵和特征值修正MUSIC（Multiple Signal Classification）等子空间算法。理论和仿真结果表明，在非相关噪声场中，基于联合对角化的子空间算法性能与常规子空间算法基本一致：而在相关噪声场中，联合对角化特征向量法能显著减小方位估计方差，提高估计性能。
基金Supported by the National Natural Science Foundation of China under Grant No.（50909028）.
文摘Spatial correlation of sound pressure and particle velocity of the surface noise in horizontally stratified media was demonstrated, with directional noise sources uniformly distributed on the ocean surface. In the evaluation of particle velocity, plane wave approximation was applied to each incident ray. Due to the equivalence of the sound source correlation property and its directivity, solutions for the spatial correlation of the field were transformed into the integration of the coherent function generated by a single directional source. As a typical horizontally stratified media, surface noise in a perfect waveguide was investigated. Correlation coefficients given by normal mode and geometric models show satisfactory agreement. Also, the normalized covariance between sound pressure and the vertical component of particle velocity is proportional to acoustic absorption coefficient, while that of the surface noise in semi-infinitely homogeneous space is zero.
