电讯技术2025，Vol.65Issue(11)：1921-1928,8.DOI:10.20079/j.issn.1001-893x.240506003
基于FrFT改进迭代自适应法的DOA估计多波束声呐成像方法
A DOA Estimation Method for Multi-beam Sonar Imaging Based on Improved Iterative Adaptive Aproach Using FrFT
摘要
Abstract
For the problem of target azimuth estimation under low signal-to-noise ratio(SNR)for active sonar in underwater environments,a direction of arrival(DOA)estimation multi-beamforming sonar imaging method based on fractional Fourier transform(FrFT)-enhanced iterative adaptive approach(IAA)is proposed.Firstly,the echo signals received by hydrophones are subjected to FrFT preprocessing,transforming the wideband linear frequency modulation(LFM)signals into narrowband signals in the fractional domain to avoid the influence of cross-interference terms.Then,focusing on LFM signals and suppressing noise in the FrFT domain is achieved.Finally,the iterative adaptive method is implemented in the FrFT domain,optimizing the power spectrum estimation method for accurate DOA estimation.Compared with traditional DOA estimation methods,the proposed method achieves better estimation accuracy and smaller root mean square error under low SNR conditions without increasing sensor array elements.It significantly improves imaging effectiveness,as indicated by simulation results showing sidelobe levels-13.364 dB for peak sidelobe ratio.in the range direction and-9.723 dB for integrated sidelobe ratio,-13.874 dB for peak sidelobe ratio in the azimuth direction and-10.034 dB for integrated sidelobe ratio.关键词
主动声呐成像/水下波达方向估计/分数阶傅里叶变换/迭代自适应法Key words
active sonar imaging/underwater DOA estimation/fractional Fourier transform/iterative adaptive approach分类
通用工业技术引用本文复制引用
蒋留兵,杨海鑫,车俐,黄乾超..基于FrFT改进迭代自适应法的DOA估计多波束声呐成像方法[J].电讯技术,2025,65(11):1921-1928,8.基金项目
国家自然科学基金资助项目(61561010) （61561010）
广西创新驱动发展专项(桂科AA21077008) （桂科AA21077008）
广西无线宽带通信与信号处理重点实验室2022年主任基金项目(GXKL06220102,GXKL06220108) （GXKL06220102,GXKL06220108）
八桂学者专项经费资助(2019A51) （2019A51）
桂林电子科技大学研究生教育创新计划资助项目(2023YXW02,YCSW2023317,2022YCXS080) （2023YXW02,YCSW2023317,2022YCXS080）
