Direction-of-Arrival (DOA) estimation concerns the estimation of direction finding signals in the form of electromagnetic or acoustic waves, impinging on a sensor or antenna array. DOA estimation is ...used for locating and tracking signal sources in both civilian and military applications. This authoritative volume provides an overview and performance analysis of the basic DOA algorithms, including comparisons between the various types.The book offers you a detailed understanding of the arrays pertinent to DOA finding, and presents a detailed illustration of the ESPRIT-based DOA algorithms complete with their performance assessments. From antennas and array receiving systems, to advanced topics on DOA estimation, this book serves as a one-stop resource for professionals and students. Nearly 100 illustrations and more than 281 equations support key topics throughout.
In order to improve the quality of undergraduate graduation design, this paper studies and improves the guidance method of electrical engineering graduation design based on the OBE concept. The ...graduation design teaching process was discussed around the topic selection stage, the topic opening stage, and the design stage. The main goal is to expand students' knowledge, enhance their engineering knowledge and improve their ability to solve practical engineering problems. The process inspection and guidance methods were optimized from the three levels of instructors, majors and colleges. The process inspection and guidance of colleges and specialties were online or offline. After the student selected the topic, the graduation design guidance and inspection of the instructor was conducted face to face or online. Through the questionnaire survey, this paper completed the achievement degree analysis of graduation design goals. The method proposed in this paper is beneficial to improving the practical ability and innovation ability of electrical engineering undergraduates.
This paper establishes an analytical model for the device drain-source overvoltage related to the two loops in three level active neutral point clamped (3L-ANPC) converters. Taking into account the ...non-linear device output capacitance, two commonly used modulations are investigated in detail. The result shows that the line switching frequency device usually has higher overvoltage, and the switching speed of the high switching frequency device is not strongly influenced by the multiple loops. By keeping the non-active clamping switch off, the effect of the non-linear device output capacitance can be significantly mitigated, which helps reduce the overvoltage. Moreover, the loop inductance can be reduced with vertical loop layout and magnetic cancellation in PCB and busbar design. A 500 kVA 3L-ANPC converter using SiC MOSFETs is built and tested. The experimental results validate the overvoltage model of the two modulations as well as the busbar design. With the non-active clamping switch off, the overvoltage of both the high and line switching frequency devices is significantly reduced, which helps achieve higher switching speed.
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