|
|
论文:2012,Vol:30,Issue(1):112-116 |
|
|
引用本文： |
|
|
易锋, 孙超, 向龙凤, 刘宗伟. 基于模态分解的最小方差模态滤波器[J]. 西北工业大学 |
|
|
Yi Feng, Sun Chao, Xiang Longfeng, Liu Zongwei. A New and Better Method of MVDR (Minimum Variance Distortionless Response) Mode Filtering Based on Mode Decomposition[J]. Northwestern polytechnical university |
|
|
|
|
|
|
|
| 基于模态分解的最小方差模态滤波器 |
|
| 易锋, 孙超, 向龙凤, 刘宗伟 |
|
| 西北工业大学 航海学院,陕西 西安 710072 |
| 摘要: |
| 针对浅海的复杂水声环境,提出了一种基于模态分解的最小方差无失真响应(MVDR)的自适应模态滤波器,利用接收阵列的声场数据和声速梯度数据,估计了各阶简正波复幅度系数。最小方差模态滤波器提取声场某阶模态时,可以抑制其它模态和噪声的影响,减弱模态滤波器对阵列长度的依赖性及对噪声的灵敏度。通过计算机仿真研究了最小方差模态滤波器的性能,并与其它线性模态滤波器进行了对比,结果表明:该自适应模态滤波器比其它线性模态滤波器能更精确地估计各阶简正波复幅度系数,并且具有良好的环境适用性特点。 |
| 关键词:
自适应滤波器
模态滤波器
模态分离
浅海
|
|
| A New and Better Method of MVDR (Minimum Variance Distortionless Response) Mode Filtering Based on Mode Decomposition |
|
| Yi Feng, Sun Chao, Xiang Longfeng, Liu Zongwei |
|
| College of Marine Engineering,Northwestern Polytechnical University,Xi'an 710072,China |
| Abstract: |
| Mode filters are commonly implemented using the sampled mode shape or pseudoinverse filters,but theydepend on the received array length and have sensitivity to white noise.We propose what we believe to be a new andbetter adaptive mode filter based on the MVDR filtering.We explain it in sections 1,2 and 3 of the full paper.Their core consists of: (1) the MVDR mode filter can estimate the complex mode coefficients by suppressing othermodes and noise; (2) the performance of the MVDR mode filter is analyzed by computer simulation based on thereceived data and the sound velocity profile in shallow water.The simulation results, presented in Figs.2, 3 and 4,and their analysis show preliminarily that: (1) the MVDR mode filter achieves the same performance as the reducedrank pseudo-inverse mode filter and offers greater performance than other linear mode filters; (2) the MVDR modefilter can estimate complex mode coefficients more accurately than other linear filters and adapt the filter coefficientsto the changing environments using the received data. |
| Key words:
adaptive filtering
algorithms
analysis
arrays
beamforming
decomposition
estimation
frequen-cies
inverse problems
measurement errors
Monte Carlo methods
multipath propagation
sampling
sensitivity analysis
signal processing
signal to noise ratio
simulation
underwater acoustics
veloci-ty
white noise
mode filter
mode decomposition
|
|
| 收稿日期: 2011-04-06
修回日期:
|
| DOI: |
| 基金项目: 国家安全重大基础研究(613110020101)；国家自然科学基金(60872146)资助 |
| 通讯作者:
Email： |
| 作者简介: 易锋(1984-),西北工业大学博士研究生,主要从事水声信号处理的研究。
|
|
| 相关功能 |
|
|
|
|
| 作者相关文章 |
|
| 易锋 在本刊中的所有文章 |
| 孙超 在本刊中的所有文章 |
| 向龙凤 在本刊中的所有文章 |
| 刘宗伟 在本刊中的所有文章 |
|
|
|
|
|
|
|
|
参考文献: |
|
|
[1] Fan W T，Zhang X H，Jiang B. A New Passive Sonar Bearing Estimation Algorithm Combined with Blind Source Separation．IEEE 2010 Third International Joint Conference Computational Science and Optimization, 2010, 1: 15～18
[2] Wang N Y，Agathokis P，Antoniou A. A New DOA Estimation Technique Based on Subarray Beamforming. IEEE Trans on Sig-nal Processing, 2006, 54(9), 3279～3290
[3] Eller A I，Miller J F. Environmental Influences on Acoustic Array Design and Performance in Shallow Water. IEEE AcousticsSpeech and Signal Processing ICASSP, 1980, 80(5):115～119
[4] Candy J V，Sullivan E J. Ocean Acoustic Signal Processing: A Model-Based Approach. J Acoust Soc Am, 1992, 92(6):3185～3201
[5] Ferris P H. Comparison of Measured and Calculated Normal-Mode Amplitude Functions for Acoustic Waves in Shallow Water. JAcoust Soc Am, 1972, 52(3B):981～988
[6] Tindle C T，Guthrie K M，Bild G E J. Measurements of the Frequency Dependence of Normal Modes. J Acoust Soc Am, 1978，64(4):1178～1185
[7] Calson B D. Covariance-Matrix Estimation Errors and Diagonal Loading in Adaptive Arrays. IEEE Trans on Aerosp ElectronSyst, 1988, 24(4):397～401
[8] Yang C T. A Method of Range and Depth Estimation by Modal Decomposition. J Acoust Soc Am, 1987, 82(5):1736～1745
[9] Williams A O. Normal-Mode Methods in Propagation of Underwater Sound. Underwater Acoustics，Wiley-Interscience，NewYork, 1970, 23～56
[10] Kuperman W A，Ingenito F. Spatial Correction of Surface Generated Noise in a Stratified Ocean. J Acoust Soc Am, 1980，67，1988～1996
[11] Frost O L. An Algorithm for Linearly Constrained Adaptive Array Processing. Proc IEEE, 1972, 60:926～935 |
|
|
|
|
|
|
|
