Article
Engineering, Aerospace
Junlong Chen, Kainam Thomas Wong, Zakayo Ndiku Morris
Summary: This article analyzes a 2-D planar configuration of three colocated cardioids oriented azimuthally apart by 120 degrees, and derives the polar/azimuthal direction-finding Cramer-Rao lower bounds in closed forms. The intricate mathematical structures of these bounds are dissected to provide refined insights and simple actionable rules-of-thumb for system engineers to choose appropriate sensor parameters.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2023)
Article
Engineering, Aerospace
Lin Yang, Kainam Thomas Wong, Zakayo Ndiku Morris
Summary: This article explores a new array grid that combines an azimuthal circular array with a linear vertical array, examining the tradeoff between azimuth-angle Cramer-Rao bound and polar-angle Cramer-Rao bound.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Engineering, Aerospace
Hao Yang, Kainam Thomas Wong, Zakayo Ndiku Morris
Summary: This article discusses an array composed of two different directional cardioid sensors, which allows for 2D direction-of-arrival estimation and simplifies signal processing computations. The article will analyze the precision of direction-of-arrival estimation for this combination and provide actionable insights for system engineers.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Chibuzo Joseph Nnonyelu, Zakayo Ndiku Morris, Chinaza Alice Madukwe
Summary: The study compared the direction finding performance of L-shaped and V-shaped arrays of first-order cardioid microphones, finding that the L-shaped array generally outperforms the V-shaped array in more regions, with higher variance ratios favoring the V-shaped array in certain areas.
IEEE SENSORS JOURNAL
(2021)
Article
Acoustics
T. Wenzel, R. Rettig
Summary: This paper discusses the development of a protective 3D-printed membrane for outdoor applications, which effectively protects MEMS-based microphones. The acoustic characteristics of the membrane are analyzed, simulated, and experimentally validated. The flexible material structure of 3D-printed membranes allows for long-term outdoor protection with minimal impact on acoustic performance.
Article
Engineering, Aerospace
Jin He, Linna Li, Ting Shu
Summary: The article introduces a new type of acoustic sensor array, SNSAVA, to address the problem of direction finding in underdetermined scenarios. By extending the spacing between sensors and sensor components, the effective array aperture is increased, resulting in improved estimation accuracy. Performance studies comparing SNSAVA with other nested acoustic sensor arrays and the Cramer-Rao bound are provided to demonstrate its effectiveness.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Min Zhang, Cheng Tu, Wenli Zhu, Chenxi Wu, Qianyu Li, Chenyang Wang, Hongjun Wang
Summary: As the electromagnetic environment becomes more complex, the phase ambiguity of high frequency limits the development of broadband direction finding technology. To solve this problem, we propose a method based on constructing virtual sparse arrays, which can eliminate the phase ambiguity and achieve high-precision broadband direction finding.
Article
Engineering, Electrical & Electronic
Ziheng Ding, Jingfeng Chen, Chong He, Ronghong Jin
Summary: This paper presents an elevation and azimuth direction-finding method by introducing a pattern reconfigurable antenna (PRA) into a two-element array. The method utilizes switchable beams of the PRA array to estimate the elevation and azimuth angles. A 2-D lookup table is built to correct the error of amplitude comparison. Compared to traditional methods, this approach has the advantages of a simple structure, compact size, and low cost.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Telecommunications
Mang Tang, Ting Shu, Jin He, Changqing Xu
Summary: The study introduces a new fully sparse array geometry termed as SAID for high accuracy direction-finding and mutual coupling effect reduction. It further suggests a direction estimation algorithm to yield unambiguous source direction estimates and provides numerical examples to justify the effectiveness of SAID in terms of estimation accuracy improvement and mutual coupling reduction.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Acoustics
Xudong Zhao, Gongping Huang, Jingdong Chen, Jacob Benesty
Summary: This article investigates the design of general two-dimensional (2D) and three-dimensional (3D) differential microphone arrays (DMAs). The authors propose a multistage design approach and derive the relationship between the global beamformer and the beamformers at different stages. Several algorithms are presented for the design of differential and robust differential beamformers. Simulation results validate the proposed approach and justify its properties.
IEEE-ACM TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Ruyu Ma, Nader Behdad
Summary: This paper presents a platform-based high-frequency antenna array that enhances bandwidth and direction-finding accuracy. By exciting characteristic modes of the platform, the array overcomes the limitations of practical DF arrays on moving platforms. Simulation and testing results demonstrate improved performance compared to standalone arrays.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Guibao Wang, Peiyao Zhao, Le Wang, Lanmei Wang
Summary: This paper proposes an aperture expanding direction finding algorithm using L-shaped non-uniform sparse array, which optimizes the virtual array, smoothing, and matrix block processing to improve the accuracy of parameter estimation.
Article
Computer Science, Information Systems
Shuai Luo, Yuexian Wang, Ling Wang, Jianying Li
Summary: In this letter, synthetic aperture technology is applied to bistatic MIMO radar, considering sensor position errors caused by sparse array motion. A new self-calibration algorithm is proposed to obtain accurate angle estimates, which approach the ideal situation well in the presence of sensor position errors. Simulation results verify the effectiveness and reliability of the proposed algorithm.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Aerospace
Jin He, Linna Li, Ting Shu
Summary: The paper introduces a new array structure SNODA that can reduce mutual coupling between sensors and achieve accurate estimation of direction.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Computer Science, Information Systems
Timothy G. Pelham, Geoff Hilton, Evangelos Mellios, Rob Lewis
Summary: The study proposes a new approach to predict the projection of a conformal aperture onto the farfield using raycasting techniques to achieve maximum beam coverage. By analyzing different types of elements and calculating their steering efficiency, the research provides strong support for conformal array design.
