Bearing Estimation Using Double Frequency Reassignment for a Linear Passive Array

Polish maritime research

Wojciech Le?niakGdansk University of TechnologyEmailOther articles by this author:De Gruyter OnlineGoogle Scholar¹  Krzysztof CzarneckiGdansk University of TechnologyEmailOther articles by this author:De Gruyter OnlineGoogle Scholar¹ 

[1] Gdansk University of Technology

关键词: Keywords: Direction of arrival;    DOA;    instantaneous frequency;    short-time Fourier transform;    STFT;    time-frequency reassignment;    intercept and surveillance sonar;    crest factor;   

DOI  :  10.1515/pomr-2017-0087

学科分类：工程和技术（综合）

来源: Politechnika Gdanska * Wydzial Oceanotechniki i Okretownictwa

【 摘 要 】

The paper demonstrates the use of frequency reassignment for bearing estimation. For this task, signals derived from a linear equispaced passive array are used. The presented method makes use of Fourier transformation based spatial spectrum estimation. It is further developed through the application of two-dimensional reassignment, which leads to obtaining highly concentrated energy distributions in the joint frequency-angle domain and sharp graphical imaging. The introduced method can be used for analysing, a priori, unknown signals of broadband, nonstationary, and/or multicomponent type. For such signals, the direction of arrival is obtained based upon the marginal energy distribution in the angle domain, through searching for arguments of its maxima. In the paper, bearing estimation of three popular types of sonar pulses, including linear and hyperbolic frequency modulated pulses, as well as no frequency modulation at all, is considered. The results of numerical experiments performed in the presence of additive white Gaussian noise are presented and compared to conventional digital sum-delay beamforming performed in the time domain. The root-mean-square error and the peak-to-average power ratio, also known as the crest factor, are introduced in order to estimate, respectively, the accuracy of the methods and the sharpness of the obtained energy distributions in the angle domain.

【 授权许可】

Unknown