scholarly journals Analysis of subspace-based direction of arrival estimation methods

Sadhana ◽  
1991 ◽  
Vol 16 (3) ◽  
pp. 183-194
Author(s):  
Bhaskar D Rao ◽  
KVS Hari
Keyword(s):  
Direction Of Arrival ◽  
Estimation Methods ◽  
Direction Of Arrival Estimation

scholarly journals Direction-of-Arrival Estimation Methods in Interferometric Echo Sounding

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3556
Author(s):  
Piotr Grall ◽  
Iwona Kochanska ◽  
Jacek Marszal
Keyword(s):  
Phase Difference ◽  
Internal Noise ◽  
Direction Of Arrival ◽  
Estimation Methods ◽  
Direction Of Arrival Estimation ◽  
Noise Sources ◽  
Side Scan Sonar ◽  
Advantages And Disadvantages ◽  
Echo Sounder ◽  
Echo Sounding

Nowadays, there are two leading sea sounding technologies: the multibeam echo sounder and the multiphase echo sounder (also known as phase-difference side scan sonar or bathymetric side scan sonar). Both solutions have their advantages and disadvantages, and they can be perceived as complementary to each other. The article reviews the development of interferometric echo sounding array configurations and the various methods applied to determine the direction-of-arrival. “Interferometric echo sounder” is a broad term, applied to various devices that primarily utilize phase difference measurements to estimate the direction-of-arrival. The article focuses on modifications to the interferometric sonar array that have led to the state-of-the-art multiphase echo sounder. The main algorithms for classical and modern interferometric echo sounder direction-of-arrival estimation are also outlined. The accuracy of direction-of-arrival estimation methods is dependent on the configuration of the array and external and internal noise sources. The main sources of errors, which influence the accuracy of the phase difference measurements, are also briefly characterized. The article ends with a review of the current research into improvements in the accuracy of interferometric echo sounding and the application of the principle of interferometric in other devices.

Fourth-Order Cumulants Beamforming for Direction of Arrival Estimation

2014 ◽  
Vol 602-605 ◽  
pp. 3384-3387
Author(s):  
Ting Ting Li
Keyword(s):  
Spatial Resolution ◽  
Fourth Order ◽  
High Spatial Resolution ◽  
Rapid Development ◽  
Direction Of Arrival ◽  
Estimation Methods ◽  
Direction Of Arrival Estimation ◽  
Robust Performance ◽  
Resolution Analysis ◽  
Simulation Results

With the rapid development of DOA (direction-of-arrival) estimation methods, the existing beamforming technologies still have the problem of a way to balance high spatial resolution and robust performance. The aperture extension characteristics of fourth-order cumulants is used to raise the spatial resolution of the array in this paper. By using the structure of minimum redundancy array, the calculation of the fourth-order cumulants matrix can be reduced. Simulations of the properties of fourth–order cumulants beamforming method are analyzed in this paper, including the resolution analysis, multi-sources analysis and error analysis. Simulation results show that the fourth-order cumulants beamforming method has a higher spatial resolution than the conventional beamforming method without increasing the number of the array sensors.

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