大连理工大学学报2018，Vol.58Issue(3)：293-301,9.DOI:10.7511/dllgxb201803010
一种水声宽带双曲调频信号波达方向估计方法
A DOA estimation method for underwater wideband HFM signals
摘要
Abstract
A method of estimating the direction of arrival(DOA)for underwater wideband hyperbolic frequency modulation (HFM)signal is proposed based on short-time fractional Fourier transform. The received wideband HFM signal data model of uniform linear array sonar in the far field is established.The received signal is divided into multiple short-time signals in time domain and fractional Fourier transform is applied to transform the traditional array data into a short-time fractional Fourier domain array data.At the same time,the time-varying array manifold matrix is correspondingly transformed into a fixed array manifold matrix.The spatial spectrum of each short-time signal is estimated by the multiple signal classification (MUSIC)algorithm,and the HFM signal spatial spectrum of the whole time is further obtained by summation operation.Finally,DOA estimation of HFM signals is realized through spectral peak search.The effectiveness of the method to estimate the DOA of underwater HFM signals is verified by simulation experiments and the influence of time domain segmentation number,SNR and sound source orientation on the performance of the method is mainly studied.Compared with the traditional method,this method has higher azimuth resolution and estimation accuracy.关键词
分数阶傅里叶变换/双曲调频信号/波达方向估计/均匀线列阵Key words
fractional Fourier transform/hyperbolic frequency modulation signal/direction of arrival estimation/uniform linear array分类
信息技术与安全科学引用本文复制引用
李军,林秋华,王凯,康春玉,杨秀庭..一种水声宽带双曲调频信号波达方向估计方法[J].大连理工大学学报,2018,58(3):293-301,9.基金项目
国家自然科学基金资助项目(61471378,91748105). （61471378,91748105）
