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Artykuły w czasopismach na temat „Ultra wide band optical systems”

Autor: Grafiati

Data publikacji: 5 października 2024

Data aktualizacji: 31 lipca 2025

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1

Yousef, Basma M., Allam M. Ameen, Bassant H. El Swiefy, and Reham Arnous. "A Compact Ultra-wide Band Antenna with a Notched Band for Wireless Communication Systems." Progress In Electromagnetics Research Letters 108 (2023): 31–39. http://dx.doi.org/10.2528/pierl22101503.

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Masuda, Hiroji. "Wide-band and low-noise optical amplification technologies in ultra-high capacity optical communication systems." Review of Laser Engineering 36, Supplement (2008): 184–85. http://dx.doi.org/10.2184/lsj.36.184.

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Koshelev, V. I., V. T. Sarychev, and S. E. Shipilov. "Estimation of the impulse response of ultra-wide-band systems." Radiophysics and Quantum Electronics 41, no. 9 (1998): 805–12. http://dx.doi.org/10.1007/bf02677635.

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Okamoto, Seiji, Kyo Minoguchi, Fukutaro Hamaoka, et al. "A Study on the Effect of Ultra-Wide Band WDM on Optical Transmission Systems." Journal of Lightwave Technology 38, no. 5 (2020): 1061–70. http://dx.doi.org/10.1109/jlt.2019.2962178.

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Tan, Mingqi. "Design of L+Band Bismuth-doped Fiber Laser." Highlights in Science, Engineering and Technology 97 (May 28, 2024): 147–51. http://dx.doi.org/10.54097/yypbq622.

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At present, the development of new communication bands to meet the needs of large communication transmission capacity in the current era is one of the key research topics. The conventional erbium-doped laser is limited by its structure which has the problem of short luminous bandwidth and can not cover a large communication band. Therefore, there is growing interest in designing bismuth-doped glass and fiber with ultra-wide gain bandwidth for fiber laser applications. By utilizing its ultra-wide gain bandwidth characteristics, important communication devices such as broadband fiber amplifiers

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6

Lu, Yong, Shaohe Lv, and Xiaodong Wang. "Adaptive Sub-Nyquist Spectrum Sensing for Ultra-Wideband Communication Systems." Symmetry 11, no. 3 (2019): 342. http://dx.doi.org/10.3390/sym11030342.

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With the ever-increasing demand for high-speed wireless data transmission, ultra-wideband spectrum sensing is critical to support the cognitive communication over an ultra-wide frequency band for ultra-wideband communication systems. However, it is challenging for the analog-to-digital converter design to fulfill the Nyquist rate for an ultra-wideband frequency band. Therefore, we explore the spectrum sensing mechanism based on the sub-Nyquist sampling and conduct extensive experiments to investigate the influence of sampling rate, bandwidth resolution and the signal-to-noise ratio on the accu

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Deshours, Frédérique, Anne-Laure Billabert, Catherine Algani, Fabrice Blache, Christian Rumelhard, and Georges Alquié. "A 40 Gbps electro-absorption modulator integrated laser modeling method for optical transmitter in ultra-wide band radio-over-fiber systems." International Journal of Microwave and Wireless Technologies 1, no. 6 (2009): 511–19. http://dx.doi.org/10.1017/s1759078709990791.

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The great interest of optical fiber links in communicating systems especially in ultra-wide band (UWB) communications has grown up in the last decade and requires co-simulation for mixed circuits design exploiting both optical and microwave domains. In this paper, we report an original modeling method of an electro-absorption modulator associated with a distributed-feedback laser to simulate an optical transmitter of an UWB over fiber system. Large signal optoelectronic device models can be developed and implemented in a high-frequency simulator, such as advanced design system-Ptolemy to analy

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8

Liu, Min, Yingqi Cui, Xiangyu Hua, Wenjun Ni, Perry Ping Shum, and Lei Huang. "Simultaneous Achievement of Low Loss, Large Effective Mode Area and Wide Transmission Band Hollow-Core Anti-Resonant Optical Fibers." Sensors 25, no. 10 (2025): 3003. https://doi.org/10.3390/s25103003.

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A novel nested structure of hollow-core anti-resonant optical fiber is proposed to achieve low loss, large effective mode area, and wide transmission band simultaneously in the near-infrared range of 1200–2200 nm. It is composed of six elliptical cladding tubes nested with six large circular cladding tubes, and six small circular cladding tubes are introduced in the gap of the elliptical tubes. The transmission characteristics of the hollow-core anti-resonant optical fiber are numerically investigated using the full-vector finite element method. The effects of structural parameters such as the

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9

Fornaser, Alberto, Luca Maule, Alessandro Luchetti, Paolo Bosetti, and Mariolino De Cecco. "Self-Weighted Multilateration for Indoor Positioning Systems." Sensors 19, no. 4 (2019): 872. http://dx.doi.org/10.3390/s19040872.

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The paper proposes an improved method for calculating the position of a movable tag whose distance to a (redundant) set of fixed beacons is measured by some suitable physical principle (typically ultra wide band or ultrasound propagation). The method is based on the multilateration technique, where the contribution of each individual beacon is weighed on the basis of a recurring, self-supported calibration of the measurement repeatability of each beacon at a given distance range. The work outlines the method and its implementation, and shows the improvement in measurement quality with respect

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10

Wang, Yong, Biaogang Xu, Dengguo Zhang, et al. "Magneto-Optical Isolator Based on Ultra-Wideband Photonic Crystals Waveguide for 5G Communication System." Crystals 9, no. 11 (2019): 570. http://dx.doi.org/10.3390/cryst9110570.

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This paper presents a novel magneto-optical isolator based on an ultra-wideband and high efficiency photonic crystals (PCs) waveguide and gyromagnetic ferrites. The three-dimensional numerical simulation finds that the photonic crystals waveguide’s (PCW) transmission efficiency rises with its height and width. The corresponding experiments are performed by using a triangular lattice Al2O3 dielectric posts array in 5G millimeter wave band. The measured transmission efficiency is up to 90.78% for the optimal PCs waveguide structure, which has ultra-wide operating bandwidth from 23.45 to 31.25 GH

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11

Basir, Shahid, Ubaid Ur Rahman Qureshi, Fazal Subhan, et al. "A Novel Monopole Ultra-Wide-Band Multiple-Input Multiple-Output Antenna with Triple-Notched Characteristics for Enhanced Wireless Communication and Portable Systems." Sensors 23, no. 15 (2023): 6985. http://dx.doi.org/10.3390/s23156985.

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This study introduces a monopole 4 × 4 Ultra-Wide-Band (UWB) Multiple-Input Multiple-Output (MIMO) antenna system with a novel structure and outstanding performance. The proposed design has triple-notched characteristics due to CSRR etching and a C-shaped curve. The notching occurs in 4.5 GHz, 5.5 GHz, and 8.8 GHz frequencies in the C-band, WLAN band, and satellite network, respectively. Complementary Split-Ring Resonators (CSRR) are etched at the feed line and ground plane, and a C-shaped curve is used to reduce interference between the ultra-wide band and narrowband. The mutual coupling of C

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12

Barde, Rajesh, Kailash Nemade, and Sandeep Waghuley. "Complex Optical Investigation of Sodium Superoxide Loaded Phosphovanadate Glass System in Ultra-Violet and Visible Region." Trends in Sciences 19, no. 23 (2022): 2077. http://dx.doi.org/10.48048/tis.2022.2077.

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Sodium superoxide loaded phosphovanadate based glass systems were prepared from a mixture of vanadium pentoxide (V2O5), phosphorus pentoxide (P2O5) boric acid (H3BO3) and sodium superoxide (NaO2) using a melt-quenching method. Amorphous phase of as-prepared glass system confirmed using XRD technique. Surface morphology of glass system studied using scanning electron microscope. Ultraviolet-visible spectroscopy was employed to extract complex optical parameters like direct and indirect optical band gap, Urbach energy, refractive index, complex dielectric constant and optical conductivity. The a

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13

Tamas, Razvan D., and Stefania Bucuci. "An Ultra-Wide Band Antenna System for Pulsed Sources Direction Finding." Sensors 20, no. 17 (2020): 4695. http://dx.doi.org/10.3390/s20174695.

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Electric discharges in high-voltage power distribution systems can be localized through their electromagnetic signature in the radio-frequency range. Since discharges produce series of short pulses, the corresponding spectrum usually covers wide frequency ranges, typically up to 1 GHz. In this paper, we propose an ultra-wide band (UWB) antenna system and a direction-finding (DF) approach based on using energy-based descriptors, instead of classical frequency-domain parameters. As an antenna system, we propose a dual-padlock configuration with a suitable pulse-matched response, featuring two un

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14

Babu, K. Vasu, and Bhuma Anuradha. "Design of MIMO antenna to interference inherent for ultra wide band systems using defected ground structure." Microwave and Optical Technology Letters 61, no. 12 (2019): 2698–708. http://dx.doi.org/10.1002/mop.31958.

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15

Abishek, B. Ebenezer, Vijayalakshmi A, Blessy Sharon Gem, and P. Sathish Kumar. "ULTRA WIDE-BAND SYSTEMS WITH ENSEMBLES OF CLASSIFIERS BASED LATENT GRAPH PREDICTOR FM FOR OPTIMAL RESOURCE PREDICTION." ICTACT Journal on Communication Technology 14, no. 4 (2023): 3043–49. http://dx.doi.org/10.21917/ijct.2023.0453.

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The proliferation of Ultra Wide-Band (UWB) systems has introduced new challenges in predicting optimal resource allocation, necessitating advanced methodologies to enhance efficiency. Current resource prediction models for UWB systems often struggle to accurately forecast optimal resource allocation due to the dynamic and complex nature of the communication environment. This study aims to overcome these limitations by introducing a novel framework that integrates machine learning ensembles and latent graph predictor FM to achieve more accurate and reliable resource predictions. While various r

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16

Mucchi, Lorenzo, Sara Jayousi, Alessio Martinelli, et al. "A Flexible Wireless Sensor Network Based on Ultra-Wide Band Technology for Ground Instability Monitoring." Sensors 18, no. 9 (2018): 2948. http://dx.doi.org/10.3390/s18092948.

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An innovative wireless sensor network (WSN) based on Ultra-Wide Band (UWB) technology for 3D accurate superficial monitoring of ground deformations, as landslides and subsidence, is proposed. The system has been designed and developed as part of an European Life+ project, called Wi-GIM (Wireless Sensor Network for Ground Instability Monitoring). The details of the architecture, the localization via wireless technology and data processing protocols are described. The flexibility and accuracy achieved by the UWB two-way ranging technique is analysed and compared with the traditional systems, suc

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17

Perez-Ramos, Aldo-Eleazar, Salvador Villarreal-Reyes, Alejandro Galaviz-Mosqueda, and Catherine Lepers. "Design of Optical-Wireless IR-UWBoF Systems with Spectral Line Suppression Capabilities." Electronics 11, no. 21 (2022): 3496. http://dx.doi.org/10.3390/electronics11213496.

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Impulse-Radio Ultra-Wide Band (IR-UWB) over Fiber (IR-UWBoF) has been proposed to interconnect IR-UWB-based deployments separated by hundreds of meters or even kilometers. IR-UWB transmissions must comply with spectral masks provided by radio spectrum regulatory agencies. The maximum transmit power of an IR-UWB signal is adversely affected by the presence of spectral lines in its Power Spectral Density (PSD). Thus, it is desirable that the PSD of signals generated by IR-UWBoF systems does not show spectral lines. Previous works have shown the feasibility of deploying of optical-wireless IR-UWB

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18

Chen, Zilong, Zhaowei Zhu, Liting Huang, and Chuantong Cheng. "High sensitivity UV photodetectors based on low-cost TiO₂ P25-graphene hybrids." Nanotechnology 33, no. 8 (2021): 08LT01. http://dx.doi.org/10.1088/1361-6528/ac3a37.

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Abstract Photodetectors (PDs) are the core component of multiple commercial optical sensing systems. Currently, the detection of ultra-weak ultraviolet (UV) optical signals is becoming increasingly important for wide range of applications in civil and military industries. Due to its wide band gap, low cost, and long-term stability, titanium dioxide (TiO2) is an attractive material for UV photodetection. A kind of low-cost TiO2 nanomaterial (named as P25) manufactured by flame hydrolysis is an easily available commercial material. However, a low-cost and high-sensitivity UV PD based on P25 has

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19

Patil, Dnyaneshwar S., and E. P. Samuel. "Analysis of Optical Properties of GaN/AlGaN Quantum Well Ultra-Violet Laser Diode Using 6X6 Hamiltonian." Materials Science Forum 638-642 (January 2010): 1653–58. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.1653.

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The Quantum well structures have exhibited significant utility in the fabrication of advanced laser devices. The Gallium nitride semiconductor and its alloy particularly AlGaN based quantum structures are having important applications in optical data storage systems and the visible displays. Due to tailoring of wide band gap energy the spectrum obtained is from visible to ultraviolet wavelength range. We had thoroughly investigated the influence of Aluminum mole fraction variation in AlxGa1-xN under a biased condition for GaN/AlGaN based quantum heterostructure optical properties. Here, we had

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20

Wang, Ye, Yongyi Chen, Li Qin, and Lijun Wang. "Optimal Design and Analysis of Wide-Band Near-Infrared Hybrid Dielectric Gratings with High Transmission Efficiency." Micromachines 15, no. 11 (2024): 1290. http://dx.doi.org/10.3390/mi15111290.

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Since surface relief transmission gratings have very strict requirements on operators and use environment, according to the semiconductor laser external cavity spectral beam combining system, this paper proposes a design scheme for a semiconductor laser array spectral beam combining system based on the grating-external cavity. The finite element approach was used to create a wideband, high-efficiency fill-in multilayer dielectric transmission grating structure for a high-power spectrum beam combining system. The incidence angle, ridge height, duty cycle, and sidewall inclination angle of the t

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21

Boyle, Alex, and Matthew E. Tolentino. "Localization within Hostile Indoor Environments for Emergency Responders." Sensors 22, no. 14 (2022): 5134. http://dx.doi.org/10.3390/s22145134.

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Recent advances in techniques to improve indoor localization accuracy for personnel and asset tracking challenges has enabled wide-spread adoption within the retail, manufacturing, and health care industries. Most currently deployed systems use distance estimates from known reference locations to localize a person or asset using geometric lateration techniques. The distances are determined using one of many radio frequency (RF) based ranging techniques. Unfortunately, such techniques are susceptible to interference and multipath propagation caused by obstructions within buildings. Because rang

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22

Jamwal, Nishant Singh, and Amirkianoosh Kiani. "Advanced Fabrication of 3D Micro/Nanostructures of Gallium Oxide with a Tuned Band Gap and Optical Properties." Micromachines 15, no. 3 (2024): 347. http://dx.doi.org/10.3390/mi15030347.

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Gallium oxide (Ga2O3) is a promising material for high-power semiconductor applications due to its wide band gap and high breakdown voltage. However, the current methods for fabricating Ga2O3 nanostructures have several disadvantages, including their complex manufacturing processes and high costs. In this study, we report a novel approach for synthesizing β-Ga2O3 nanostructures on gallium phosphide (GaP) using ultra-short laser pulses for in situ nanostructure generation (ULPING). We varied the process parameters to optimize the nanostructure formation, finding that the ULPING method produces

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Sheikh, Muhammad Usman, Boxuan Xie, Kalle Ruttik, Hüseyin Yiğitler, Riku Jäntti, and Jyri Hämäläinen. "Ultra-Low-Power Wide Range Backscatter Communication Using Cellular Generated Carrier." Sensors 21, no. 8 (2021): 2663. http://dx.doi.org/10.3390/s21082663.

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With the popularization of Internet-of-things (IoT) and wireless communication systems, a diverse set of applications in smart cities are emerging to improve the city-life. These applications usually require a large coverage area and minimal operation and maintenance cost. To this end, the recently emerging backscatter communication (BC) is gaining interest in both industry and academia as a new communication paradigm that provides high energy efficient communications that may even work in a battery-less mode and, thus, it is well suited for smart city applications. However, the coverage of BC

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Farhad, Arshad, and Jae-Young Pyun. "Terahertz Meets AI: The State of the Art." Sensors 23, no. 11 (2023): 5034. http://dx.doi.org/10.3390/s23115034.

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Terahertz (THz) is a promising technology for future wireless communication networks, particularly for 6G and beyond. The ultra-wide THz band, ranging from 0.1 to 10 THz, can potentially address the limited capacity and scarcity of spectrum in current wireless systems such as 4G-LTE and 5G. Furthermore, it is expected to support advanced wireless applications requiring high data transmission and quality services, i.e., terabit-per-second backhaul systems, ultra-high-definition streaming, virtual/augmented reality, and high-bandwidth wireless communications. In recent years, artificial intellig

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Qu, Yuwei, Jinhui Yuan, Shi Qiu, et al. "A Novel Gold Film-Coated V-Shape Dual-Core Photonic Crystal Fiber Polarization Beam Splitter Covering the E + S + C + L + U Band." Sensors 21, no. 2 (2021): 496. http://dx.doi.org/10.3390/s21020496.

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In this paper, a novel gold film-coated V-shape dual-core photonic crystal fiber (V-DC-PCF) polarization beam splitter (PBS) based on surface plasmon resonance effect is proposed. The coupling lengths of the X-polarization (X-pol) and Y-polarization (Y-pol) and the corresponding coupling length ratio of the proposed V-DC-PCF PBS without gold film and with gold film are compared. The fiber structure parameters and thickness of the gold film are optimized through investigating their effects on the coupling lengths and coupling length ratio. As the propagation length increases, the normalized out

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Ruman, Kornel, Alena Pietrikova, Pavol Galajda, Igor Vehec, Tibor Rovensky, and Martin Kmec. "A new approach to construction of extended kit for M-Sequence UWB sensor system based on LTCC." Microelectronics International 33, no. 3 (2016): 130–35. http://dx.doi.org/10.1108/mi-03-2016-0029.

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Purpose The purpose of this paper is to introduce modified in–phase and quadrature components (I–Q) demodulator based on low temperature co-fired ceramics (LTCC) dielectric substrate GreenTape 951PX for M-Sequence ultra-wide band (UWB) sensor system. Design/methodology/approach Microstrip low pass (LP) and band pass (BP) filters for UWB sensor systems with required properties (for both filters, minimum attenuation is −40dB in stopband, bandwidth of pass band is 6 to 8.5 GHz for BP filter and cutoff frequency is 2.5 GHz for LP filter) were designed, simulated, fabricated and measured using diel

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Li, Lixia, Chuang Zhu, Haixia Liu, Yan Li, Qi Wang, and Kun Su. "Quality Factor Enhancement of Piezoelectric MEMS Resonator Using a Small Cross-Section Connection Phononic Crystal." Sensors 22, no. 20 (2022): 7751. http://dx.doi.org/10.3390/s22207751.

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Anchor loss is usually the most significant energy loss factor in Micro-Electro-Mechanical Systems (MEMS) resonators, which seriously hinders the application of MEMS resonators in wireless communication. This paper proposes a cross-section connection phononic crystal (SCC-PnC), which can be used for MEMS resonators of various overtone modes. First, using the finite element method to study the frequency characteristics and delay line of the SCC-PnC band, the SCC-PnC has an ultra-wide bandgap of 56.6–269.6 MHz. Next, the effects of the height h and the position h1 of the structural parameters of

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Gillani, S. S. A., Nisar Fatima, I. Zeba, et al. "Static isotropic pressure induced ultra-wide band gap response of NaCaF₃ fluoro-perovskite and its repercussions on optical properties: ab initio calculation." Molecular Simulation 47, no. 18 (2021): 1549–57. http://dx.doi.org/10.1080/08927022.2021.1992406.

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Pino-Ortega, José, Asier Los Arcos, Petrus Gantois, Filipe Manuel Clemente, Fabio Yuzo Nakamura, and Markel Rico-González. "The Influence of Antenna Height on the Measurement of Collective Variables Using an Ultra-Wide Band Based Local Positioning System in Team Sports." Sensors 21, no. 7 (2021): 2424. http://dx.doi.org/10.3390/s21072424.

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Ultra-wide band (UWB) based local positioning systems (LPS) are based on devices and a portable antenna set. The optimal installation height of the antennae is crucial to ensure data accuracy. Collective variables are metrics that consider at least two pairs of coordinates, which may lead to lower precision than an individual one. Therefore, the aim of this study was to compare the influence of antenna height with collective metrics using a UWB (i.e., IMU; WIMU PRO™, RealTrack Systems, Almeria, Spain) based LPS. Data acquisition was carried out in a basketball court measuring 28 × 15 m. Five d

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Du, Jinxin, Ruimeng Wang, Haiyan Li, Xue-Xia Yang, and Christophe Roblin. "All-Textile Compact Ultra-Wideband Microstrip Antenna with Full Ground Plane for WBAN Applications." International Journal of Antennas and Propagation 2024 (January 27, 2024): 1–10. http://dx.doi.org/10.1155/2024/4236695.

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A novel low-profile all-textile microstrip antenna for ultra-wideband (UWB) applications in wireless body area networks (WBANs) is presented. The antenna incorporates flexible materials such as felt and conductive fabrics which provide optimal wearing comfort and durability. The use of a single dielectric substrate layer facilitates the integration process. The antenna also features a full background plane that minimizes the back radiation towards the human body. Multiple branches are designed in a compact area to generate adjacent resonances, and their combination achieves broadband character

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Nefyodov, Eugeniy I., Igor N. Ponomarev, and Viacheslav P. Zayarnyi. "The structure of the radiation field of a symmetric slot line perpendicular to the edge of an infinite half-plane, taking into account the cross-polarization component." Physics of Wave Processes and Radio Systems 26, no. 2 (2023): 27–35. http://dx.doi.org/10.18469/1810-3189.2023.26.2.27-35.

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Background. Symmetric slot lines on a perfectly reflecting half-plane are good mathematical models for slot antennas on an ideal plane of finite dimensions, which in practice have a high gain and operate over a wide frequency band. These antennas are used in ultra-fast information processing systems based on microwave and optical volume integrated circuits. Aim. The work presents a solution to the problem of radiation of a perfectly reflecting half-plane, which was excited by a symmetric slot line with a different law of slot expansion. Methods. The problem was solved by the Fourier variable s

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Kremeyer, T., M. Krause, S. Fischer, et al. "Spectroscopic camera system at Wendelstein 7-X." Journal of Instrumentation 20, no. 04 (2025): T04003. https://doi.org/10.1088/1748-0221/20/04/t04003.

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Abstract A network of spectroscopic cameras was installed and successfully operated during the entire operation phase 1 of the optimized stellarator, Wendelstein 7-X. This diagnostic system enabled spatially resolved measurements of photon fluxes at specific wavelengths. Narrow band pass filters in the optical path allowed for targeted photon flux measurements of various spectral lines, specifically for the main ion species, hydrogen, and the primary impurity, carbon. The cameras were arranged in a stellarator-symmetric configuration, with one camera assembly per half-module. Each camera was e

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Qu, Yuwei, Ying Han, Jinhui Yuan, et al. "A Novel Liquid Crystal-Filled, Dual-Core Photonic Crystal Fiber Polarization Beam Splitter Covering the E + S + C + L + U Communication Band." Photonics 8, no. 11 (2021): 461. http://dx.doi.org/10.3390/photonics8110461.

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This paper proposes a novel liquid crystal-filled, dual core photonic crystal fiber polarization beam splitter (LC-DC-PCF PBS) based on the coupled mode theory of DC-PCF. The mode birefringence of odd and even modes, coupling lengths (CLs) of the X-polarization (X-pol) and Y-polarization (Y-pol), and the corresponding coupling length ratio (CLR) of the proposed LC-DC-PCF PBS filled without LC E7 and with LC E7 are compared. The change rules of the CLs of the X-pol and Y-pol and CLR of the proposed LC-DC-PCF with wavelengths for different cladding microstructure parameters were investigated. Th

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Delamare, Mickael, Fabrice Duval, and Remi Boutteau. "A New Dataset of People Flow in an Industrial Site with UWB and Motion Capture Systems." Sensors 20, no. 16 (2020): 4511. http://dx.doi.org/10.3390/s20164511.

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Improving performance and safety conditions in industrial sites remains a key objective for most companies. Currently, the main goal is to be able to dynamically locate both people and goods on the site. Security and access regulation to restricted areas are often ensured by doors or badge barriers and those have several issues when faced with people being in places they are not supposed to be in or even tools of objects being used incorrectly. In addition to this, a growing use of new devices requires precise information about their location in the environment such as mobile robots or drones.

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Rapinski, Jacek, and Artur Janowski. "The Optimal Location of Ground-Based GNSS Augmentation Transceivers." Geosciences 9, no. 3 (2019): 107. http://dx.doi.org/10.3390/geosciences9030107.

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Modern Global Navigation Satellite Systems (GNSS) allow for positioning with accuracies ranging from tens of meters to single millimeters depending on user requirements and available equipment. A major disadvantage of these systems is their unavailability or limited availability when the sky is obstructed. One solution is to use additional range measurements from ground-based nodes located in the vicinity of the receiver. The highest accuracy of distance measurement can be achieved using ultra wide band (UWB) or ZigBee phase shift measurement. The position of the additional transmitter must be

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Muraviev, Sergei, Vitaly Dorofeev, Pavel Kuznechikov, Artem Sharafeev, Maksim Koptev та Arkady Kim. "Broadband Amplification in the 2.6–2.9 μm Wavelength Range in High-Purity Er3+-Doped Zinc-Tellurite Fibers Pumped by Diode Lasers". Photonics 10, № 10 (2023): 1140. http://dx.doi.org/10.3390/photonics10101140.

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In recent years, great progress has been made in the technology of high-purity and ultra-dry tellurite glasses, which has enabled the creation of high-purity single-mode tellurite fibers doped with rare-earth ions. This technology has made it possible to demonstrate laser generation in the range of about 2.7 μm in erbium-doped tungsten tellurite fibers. In this paper, we present an experimental study of broadband amplification in erbium-doped zinc-tellurite fibers. Zinc-tellurite glasses containing modifying components, such as Na2O, La2O3, Bi2O3, or rare-earth metal oxides, are known to have

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Chahine, Georges, Pete Schroepfer, Othmane-Latif Ouabi, and Cédric Pradalier. "A Magnetic Crawler System for Autonomous Long-Range Inspection and Maintenance on Large Structures." Sensors 22, no. 9 (2022): 3235. http://dx.doi.org/10.3390/s22093235.

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The inspection and maintenance of large-scale industrial structures are major challenges that require time-efficient and reliable solutions to ensure the healthy condition of structures during operation. Autonomous robots may provide a promising solution for this purpose. In particular, they could lead to faster and more reliable inspection and maintenance without direct intervention from human operators. In this paper, we present a custom magnetic crawler system, and sensor suit and sensing modalities to enable such robotic operation. We first describe a localization framework based on a mesh

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38

Huang, Zhenchuan, Shuanggen Jin, Ke Su, and Xu Tang. "Multi-GNSS Precise Point Positioning with UWB Tightly Coupled Integration." Sensors 22, no. 6 (2022): 2232. http://dx.doi.org/10.3390/s22062232.

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Global Navigation Satellite Systems (GNSSs) can provide high-precision positioning services, which can be applied to fields including navigation and positioning, autonomous driving, unmanned aerial vehicles and so on. However, GNSS signals are easily disrupted in complex environments, which results in a positioning performance with a significantly inferior accuracy and lengthier convergence time, particularly for the single GNSS system. In this paper, multi-GNSS precise point positioning (PPP) with tightly integrating ultra-wide band (UWB) technology is presented to implement fast and precise

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Moragrega, Ana, and Carles Fernández-Prades. "A Data-Driven Factor Graph Model for Anchor-Based Positioning." Sensors 23, no. 12 (2023): 5660. http://dx.doi.org/10.3390/s23125660.

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This work presents a data-driven factor graph (FG) model designed to perform anchor-based positioning. The system makes use of the FG to compute the target position, given the distance measurements to the anchor node that know its own position.The aim was to design a hybrid structure (that involves data and modeling approaches) to address positioning models from a Bayesian point of view, customizing them for each technology and scenario. The weighted geometric dilution of precision (WGDOP) metric, which measures the effect on the positioning solution of distance error to the corresponding anch

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Crețu-Sîrcu, Amalia Lelia, Henrik Schiøler, Jens Peter Cederholm, et al. "Evaluation and Comparison of Ultrasonic and UWB Technology for Indoor Localization in an Industrial Environment." Sensors 22, no. 8 (2022): 2927. http://dx.doi.org/10.3390/s22082927.

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Evaluations of different technologies and solutions for indoor localization exist but only a few are aimed at the industrial context. In this paper, we compare and analyze two prominent solutions based on Ultra Wide Band Radio (Pozyx) and Ultrasound (GoT), both installed in an industrial manufacturing laboratory. The comparison comprises a static and a dynamic case. The static case evaluates average localization errors over 90 s intervals for 100 ground-truth points at three different heights, corresponding to different relevant objects in an industrial environment: mobile robots, pallets, for

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Bonnin-Pascual, Francisco, and Alberto Ortiz. "UWB-Based Self-Localization Strategies: A Novel ICP-Based Method and a Comparative Assessment for Noisy-Ranges-Prone Environments." Sensors 20, no. 19 (2020): 5613. http://dx.doi.org/10.3390/s20195613.

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Ultra-Wide-Band (UWB) positioning systems are now a real option to estimate the position of generic agents (e.g., robots) within indoor/GPS-denied environments. However, these environments can comprise metallic structures or other elements which can negatively affect the signal transmission and hence the accuracy of UWB-based position estimations. Regarding this fact, this paper proposes a novel method based on point-to-sphere ICP (Iterative Closest Point) to determine the 3D position of a UWB tag. In order to improve the results in noise-prone environments, our method first selects the anchor

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Bian, Sizhen, Peter Hevesi, Leif Christensen, and Paul Lukowicz. "Induced Magnetic Field-Based Indoor Positioning System for Underwater Environments." Sensors 21, no. 6 (2021): 2218. http://dx.doi.org/10.3390/s21062218.

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Autonomous underwater vehicles (AUV) are seen as an emerging technology for maritime exploration but are still restricted by the availability of short range, accurate positioning methods necessary, e.g., when docking remote assets. Typical techniques used for high-accuracy positioning in indoor use case scenarios, such as systems using ultra-wide band radio signals (UWB), cannot be applied for underwater positioning because of the quick absorption of the positioning medium caused by the water. Acoustic and optic solutions for underwater positioning also face known problems, such as the multi-p

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Yuan, Debao, Jian Zhang, Jian Wang, Ximin Cui, Fei Liu, and Yalei Zhang. "Robustly Adaptive EKF PDR/UWB Integrated Navigation Based on Additional Heading Constraint." Sensors 21, no. 13 (2021): 4390. http://dx.doi.org/10.3390/s21134390.

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At present, GNSS (Global Navigation Satellite System) positioning technology is widely used for outdoor positioning services because of its high-precision positioning characteristics. However, in indoor environments, effective position information cannot be provided, because of the signals being obscured. In order to improve the accuracy and continuity of indoor positioning systems, in this paper, we propose a PDR/UWB (Pedestrian Dead Reckoning and Ultra Wide Band) integrated navigation algorithm based on an adaptively robust EKF (Extended Kalman Filter) to address the problem of error accumul

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Castañeda-Miranda, Víctor H., Luis F. Luque-Vega, Emmanuel Lopez-Neri, Jesús Antonio Nava-Pintor, Héctor A. Guerrero-Osuna, and Gerardo Ornelas-Vargas. "Two-Dimensional Cartesian Coordinate System Educational Toolkit: 2D-CACSET." Sensors 21, no. 18 (2021): 6304. http://dx.doi.org/10.3390/s21186304.

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Engineering education benefits from the application of modern technology, allowing students to learn essential Science, Technology, Engineering, and Mathematics (STEM) related concepts through hands-on experiences. Robotic kits have been used as an innovative tool in some educational fields, being readily accepted and adopted. However, most of the time, such kits’ knowledge level requires understanding basic concepts that are not always appropriate for the student. A critical concept in engineering is the Cartesian Coordinate System (CCS), an essential tool for every engineering, from graphing

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Gabela, Jelena, Guenther Retscher, Salil Goel, et al. "Experimental Evaluation of a UWB-Based Cooperative Positioning System for Pedestrians in GNSS-Denied Environment." Sensors 19, no. 23 (2019): 5274. http://dx.doi.org/10.3390/s19235274.

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Cooperative positioning (CP) utilises information sharing among multiple nodes to enable positioning in Global Navigation Satellite System (GNSS)-denied environments. This paper reports the performance of a CP system for pedestrians using Ultra-Wide Band (UWB) technology inGNSS-denied environments. This data set was collected as part of a benchmarking measurementcampaign carried out at the Ohio State University in October 2017. Pedestrians were equippedwith a variety of sensors, including two different UWB systems, on a specially designed helmetserving as a mobile multi-sensor platform for CP.

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Tong, Haibin, Ning Xin, Xianli Su, Tengfeng Chen, and Jingjing Wu. "A Robust PDR/UWB Integrated Indoor Localization Approach for Pedestrians in Harsh Environments." Sensors 20, no. 1 (2019): 193. http://dx.doi.org/10.3390/s20010193.

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Wireless sensor networks (WSNs) and the Internet of Things (IoT) have been widely used in industrial, construction, and other fields. In recent years, demands for pedestrian localization have been increasing rapidly. In most cases, these applications work in harsh indoor environments, which have posed many challenges in achieving high-precision localization. Ultra-wide band (UWB)-based localization systems and pedestrian dead reckoning (PDR) algorithms are popular. However, both have their own advantages and disadvantages, and both exhibit a poor performance in harsh environments. UWB-based lo

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Lv, Hao, Teng Jiao, Yang Zhang, Fulai Liang, Fugui Qi, and Jianqi Wang. "A Novel Method for Breath Detection via Stepped-Frequency Continuous Wave Ultra-Wideband (SFCW UWB) Radars Based on Operational Bandwidth Segmentation." Sensors 18, no. 11 (2018): 3873. http://dx.doi.org/10.3390/s18113873.

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Human being detection via ultra-wideband (UWB) radars has shown great prospects in many areas, such as biomedicine, military operation, public security, emergency rescue, and so on. When a person stays stationary, the main feature that separates him/her from surroundings is the movement of chest wall due to breath. There have been many algorithms developed for breath detection while using UWB radars. However, those algorithms were almost based on a basic scheme that focused on processing in the time dimension of UWB data. They did not utilize the benefits from the wide operational bandwidth of

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Packiaraj, D., M. Ramesh, and A. T. Kalghatgi. "Ultra wide band filter with wide stop band." Microwave and Optical Technology Letters 49, no. 2 (2006): 436–39. http://dx.doi.org/10.1002/mop.22166.

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Baqué, Rémi, Luc Vignaud, Valentine Wasik, et al. "MIC: Microwave Imaging Curtain for Dynamic and Automatic Detection of Weapons and Explosive Belts." Sensors 23, no. 23 (2023): 9531. http://dx.doi.org/10.3390/s23239531.

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DEXTER (detection of explosives and firearms to counter terrorism) is a project funded by NATO’s Science for Peace and Security (SPS) program with the goal of developing an integrated system capable of remotely and accurately detecting explosives and firearms in public places without impeding the flow of pedestrians. While body scanner systems in secure areas of public places are becoming more and more efficient, the attack at Brussels airport on 22 March 2016, upstream of these systems, in the middle of the crowd of passengers, demonstrated the lack of discreet and real-time security against

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Packiaraj, D., K. J. Vinoy, M. Ramesh, A. T. Kalghatgi, Varsha Chaware, and G. J. Phatak. "LTCC ultra wide band filter." Microwave and Optical Technology Letters 53, no. 11 (2011): 2580–83. http://dx.doi.org/10.1002/mop.26311.

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