Results 91 to 100 of about 751,749 (193)
Isotopy and equivalence of knots in 3‐manifolds
Journal of the London Mathematical Society, Volume 113, Issue 6, June 2026.Abstract Two knots K$K$ and J$J$ in S3$S^3$ are isotopic if and only if they are related by an orientation‐preserving diffeomorphism of S3$S^3$. This claim follows from the fact that any orientation‐preserving self‐diffeomorphism of S3$S^3$ is isotopic to the identity. We show that this same idea applies to any prime oriented closed 3‐manifold.
Paolo Aceto +4 more
wiley +1 more source
IEEE Access, 2018 Direct position determination (DPD) is a new promising technique in wireless location. Compared with conventional two-step localization methods, DPD achieves a higher accuracy by directly estimating the source location without computing the intermediate ...
Yan-Kui Zhang +4 more
doaj +1 more source
An Enhanced Spatial Smoothing Technique of Coherent DOA Estimation with Moving Coprime Array. [PDF]
Sensors (Basel), 2023 Yang M, Zhang Y, Sun Y, Zhang X.
europepmc +1 more source
, 2022 Recently, the concept of the difference and sum coarray has attracted increasing interest in the direction of the arrival estimation field because it can generate enhanced degrees of freedom. In this paper, we propose an improved transformed nested array
Weijiang Wang +5 more
core +1 more source
Improving performance of direction-of-arrival estimation using sparse array in passive radar
Journal of Algorithms & Computational Technology, 2020 A method based on sparse array is applied to direction-of-arrival estimation of passive radar in this paper to increase the number of resolvable sources and improve the direction-of-arrival estimation performance for coprime array.
Geng Chen +3 more
doaj +1 more source
Fast DOA Estimation Algorithms via Positive Incremental Modified Cholesky Decomposition for Augmented Coprime Array Sensors. [PDF]
Sensors (Basel), 2023 Song J, Cao L, Zhao Z, Wang D, Fu C.
europepmc +1 more source
Computationally Efficient Direction-of-Arrival Estimation Algorithms for a Cubic Coprime Array. [PDF]
Sensors (Basel), 2021 Gong P, Chen X.
europepmc +1 more source
Joint Estimation Method of DOD and DOA of Bistatic Coprime Array MIMO Radar for Coherent Targets Based on Low-Rank Matrix Reconstruction. [PDF]
Sensors (Basel), 2022 You Z, Hu G, Zhou H, Zheng G.
europepmc +1 more source
The recently introduced Dual Coprime Frequency Diverse Array-Multiple Input Multiple Output (DCFDA-MIMO) array configuration employs a unique setup with a coprime number of transmitters and receivers, as well as coprime frequency offsets between ...
Khan, Wasim +4 more
core +1 more source
SAR 3D sparse imaging based on CLA
The Journal of Engineering, 2019 A novel method for synthetic aperture radar (SAR) three-dimensional (3D) sparse imaging based on a coprime linear array (CLA) is proposed. To reduce the geometric resolution loss caused by under-sampled sparse SAR, a jointed sparse imaging approach is ...
Bokun Tian +4 more
doaj +1 more source