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https://www.readbyqxmd.com/read/29035350/asymmetric-dual-band-tracking-technique-for-optimal-joint-processing-of-bds-b1i-and-b1c-signals
#1
Chuhan Wang, Xiaowei Cui, Tianyi Ma, Sihao Zhao, Mingquan Lu
Along with the rapid development of the Global Navigation Satellite System (GNSS), satellite navigation signals have become more diversified, complex, and agile in adapting to increasing market demands. Various techniques have been developed for processing multiple navigation signals to achieve better performance in terms of accuracy, sensitivity, and robustness. This paper focuses on a technique for processing two signals with separate but adjacent center frequencies, such as B1I and B1C signals in the BeiDou global system...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035348/air-coupled-ultrasonic-receivers-with-high-electromechanical-coupling-pmn-32-pt-strip-like-piezoelectric-elements
#2
Rymantas J Kazys, Reimondas Sliteris, Justina Sestoke
For improvement of the efficiency of air-coupled ultrasonic transducers PMN-32%PT piezoelectric crystals which possess very high piezoelectric properties may be used. The electromechanical coupling factor of such crystals for all main vibration modes such as the thickness extension and transverse extension modes is more than 0.9. Operation of ultrasonic transducers with such piezoelectric elements in transmitting and receiving modes is rather different. Therefore, for transmission and reception of ultrasonic signals, separate piezoelectric elements with different dimensions must be used...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035347/modeling-the-energy-performance-of-lorawan
#3
Lluís Casals, Bernat Mir, Rafael Vidal, Carles Gomez
LoRaWAN is a flagship Low-Power Wide Area Network (LPWAN) technology that has highly attracted much attention from the community in recent years. Many LoRaWAN end-devices, such as sensors or actuators, are expected not to be powered by the electricity grid; therefore, it is crucial to investigate the energy consumption of LoRaWAN. However, published works have only focused on this topic to a limited extent. In this paper, we present analytical models that allow the characterization of LoRaWAN end-device current consumption, lifetime and energy cost of data delivery...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035345/an-improved-scheduling-algorithm-for-data-transmission-in-ultrasonic-phased-arrays-with-multi-group-ultrasonic-sensors
#4
Wenming Tang, Guixiong Liu, Yuzhong Li, Daji Tan
High data transmission efficiency is a key requirement for an ultrasonic phased array with multi-group ultrasonic sensors. Here, a novel FIFOs scheduling algorithm was proposed and the data transmission efficiency with hardware technology was improved. This algorithm includes FIFOs as caches for the ultrasonic scanning data obtained from the sensors with the output data in a bandwidth-sharing way, on the basis of which an optimal length ratio of all the FIFOs is achieved, allowing the reading operations to be switched among all the FIFOs without time slot waiting...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035344/a-phase-intensity-surface-plasmon-resonance-biosensor-for-avian-influenza-a-h5n1-detection
#5
Chi Lok Wong, Marissa Chua, Heather Mittman, Li Xian Choo, Hann Qian Lim, Malini Olivo
In this paper, we present a phase-intensity surface plasmon resonance (SPR) biosensor and demonstrate its use for avian influenza A (H5N1) antibody biomarker detection. The sensor probes the intensity variation produced by the steep phase response at surface plasmon excitation. The prism sensor head is fixed between a pair of polarizers with a perpendicular orientation angle and a forbidden transmission path. At SPR, a steep phase change is introduced between the p- and s-polarized light, and this rotates the polarization ellipse of the transmission beam...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035341/research-on-the-fusion-of-dependent-evidence-based-on-rank-correlation-coefficient
#6
Fengjian Shi, Xiaoyan Su, Hong Qian, Ning Yang, Wenhua Han
In order to meet the higher accuracy and system reliability requirements, the information fusion for multi-sensor systems is an increasing concern. Dempster-Shafer evidence theory (D-S theory) has been investigated for many applications in multi-sensor information fusion due to its flexibility in uncertainty modeling. However, classical evidence theory assumes that the evidence is independent of each other, which is often unrealistic. Ignoring the relationship between the evidence may lead to unreasonable fusion results, and even lead to wrong decisions...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035335/selectivity-enhancement-in-electronic-nose-based-on-an-optimized-dqn
#7
Yu Wang, Jianguo Xing, Shu Qian
In order to enhance the selectivity of metal oxide gas sensors, we use a flow modulation method to exploit transient sensor information. The method is based on modulating the flow of the carrier gas that brings the species to be measured into the sensor chamber. We present an active perception strategy by using a DQN which can optimize the flow modulation online. The advantage of DQN is not only that the classification accuracy is higher than traditional methods such as PCA, but also that it has a good adaptability under small samples and labeled data...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035334/a-low-cost-sensors-approach-for-accurate-vehicle-localization-and-autonomous-driving-application
#8
Rafael Vivacqua, Raquel Vassallo, Felipe Martins
Autonomous driving in public roads requires precise localization within the range of few centimeters. Even the best current precise localization system based on the Global Navigation Satellite System (GNSS) can not always reach this level of precision, especially in an urban environment, where the signal is disturbed by surrounding buildings and artifacts. Laser range finder and stereo vision have been successfully used for obstacle detection, mapping and localization to solve the autonomous driving problem...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035333/water-quality-sensing-and-spatio-temporal-monitoring-structure-with-autocorrelation-kernel-methods
#9
Iván P Vizcaíno, Enrique V Carrera, Sergio Muñoz-Romero, Luis H Cumbal, José Luis Rojo-Álvarez
Pollution on water resources is usually analyzed with monitoring campaigns, which consist of programmed sampling, measurement, and recording of the most representative water quality parameters. These campaign measurements yields a non-uniform spatio-temporal sampled data structure to characterize complex dynamics phenomena. In this work, we propose an enhanced statistical interpolation method to provide water quality managers with statistically interpolated representations of spatial-temporal dynamics. Specifically, our proposal makes efficient use of the a priori available information of the quality parameter measurements through Support Vector Regression (SVR) based on Mercer's kernels...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035329/camera-calibration-robust-to-defocus-using-phase-shifting-patterns
#10
Bolin Cai, Yuwei Wang, Keyi Wang, Mengchao Ma, Xiangcheng Chen
Camera parameters can't be estimated accurately using traditional calibration methods if the camera is substantially defocused. To tackle this problem, an improved approach based on three phase-shifting circular grating (PCG) arrays is proposed in this paper. Rather than encoding the feature points into the intensity, the proposed method encodes the feature points into the phase distribution, which can be recovered precisely using phase-shifting methods. The PCG centers are extracted as feature points, which can be located accurately even if the images are severely blurred...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035296/a-wireless-monitoring-system-using-a-tunneling-sensor-array-in-a-smart-oral-appliance-for-sleep-apnea-treatment
#11
Kun-Ying Yeh, Chao-Chi Yeh, Chun-Chang Wu, Kuan Tang, Jyun-Yi Wu, Yun-Ting Chen, Ming-Xin Xu, Yunn-Jy Chen, Yao-Joe Yang, Shey-Shi Lu
Sleep apnea is a serious sleep disorder, and the most common type is obstructive sleep apnea (OSA). Untreated OSA will cause lots of potential health problems. Oral appliance therapy is an effective and popular approach for OSA treatment, but making a perfect fit for each patient is time-consuming and decreases its efficiency considerably. This paper proposes a System-on-a-Chip (SoC) enabled sleep monitoring system in a smart oral appliance, which is capable of intelligently collecting the physiological data about tongue movement through the whole therapy...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035295/nighttime-foreground-pedestrian-detection-based-on-three-dimensional-voxel-surface-model
#12
Jing Li, Fangbing Zhang, Lisong Wei, Tao Yang, Zhaoyang Lu
Pedestrian detection is among the most frequently-used preprocessing tasks in many surveillance application fields, from low-level people counting to high-level scene understanding. Even though many approaches perform well in the daytime with sufficient illumination, pedestrian detection at night is still a critical and challenging problem for video surveillance systems. To respond to this need, in this paper, we provide an affordable solution with a near-infrared stereo network camera, as well as a novel three-dimensional foreground pedestrian detection model...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29035290/relative-humidity-sensor-based-on-no-core-fiber-coated-by-agarose-gel-film
#13
Wei Xu, Jia Shi, Xianchao Yang, Degang Xu, Feng Rong, Junfa Zhao, Jianquan Yao
A relative humidity (RH) sensor based on single-mode-no-core-single-mode fiber (SNCS) structure is proposed and experimentally demonstrated. The agarose gel is coated on the no-core fiber (NCF) as the cladding, and multimode interference (MMI) occurs in the SNCS structure. The transmission spectrum of the sensor is modulated at different ambient relative humidities due to the tunable refractive index property of the agarose gel film. The relative humidity can be measured by the wavelength shift and intensity variation of the dip in the transmission spectra...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29036930/automatic-hotspot-and-sun-glint-detection-in-uav-multispectral-images
#14
Damian Ortega-Terol, David Hernandez-Lopez, Rocio Ballesteros, Diego Gonzalez-Aguilera
Last advances in sensors, photogrammetry and computer vision have led to high-automation levels of 3D reconstruction processes for generating dense models and multispectral orthoimages from Unmanned Aerial Vehicle (UAV) images. However, these cartographic products are sometimes blurred and degraded due to sun reflection effects which reduce the image contrast and colour fidelity in photogrammetry and the quality of radiometric values in remote sensing applications. This paper proposes an automatic approach for detecting sun reflections problems (hotspot and sun glint) in multispectral images acquired with an Unmanned Aerial Vehicle (UAV), based on a photogrammetric strategy included in a flight planning and control software developed by the authors...
October 15, 2017: Sensors
https://www.readbyqxmd.com/read/29036926/evaluation-of-sensible-heat-flux-and-evapotranspiration-estimates-using-a-surface-layer-scintillometer-and-a-large-weighing-lysimeter
#15
Jerry E Moorhead, Gary W Marek, Paul D Colaizzi, Prasanna H Gowda, Steven R Evett, David K Brauer, Thomas H Marek, Dana O Porter
Accurate estimates of actual crop evapotranspiration (ET) are important for optimal irrigation water management, especially in arid and semi-arid regions. Common ET sensing methods include Bowen Ratio, Eddy Covariance (EC), and scintillometers. Large weighing lysimeters are considered the ultimate standard for measurement of ET, however, they are expensive to install and maintain. Although EC and scintillometers are less costly and relatively portable, EC has known energy balance closure discrepancies. Previous scintillometer studies used EC for ground-truthing, but no studies considered weighing lysimeters...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036925/evaluating-oilseed-biofuel-production-feasibility-in-california-s-san-joaquin-valley-using-geophysical-and-remote-sensing-techniques
#16
Dennis L Corwin, Kevin Yemoto, Wes Clary, Gary Banuelos, Todd H Skaggs, Scott M Lesch, Elia Scudiero
Though more costly than petroleum-based fuels and a minor component of overall military fuel sources, biofuels are nonetheless strategically valuable to the military because of intentional reliance on multiple, reliable, secure fuel sources. Significant reduction in oilseed biofuel cost occurs when grown on marginally productive saline-sodic soils plentiful in California's San Joaquin Valley (SJV). The objective is to evaluate the feasibility of oilseed production on marginal soils in the SJV to support a 115 ML yr(-1) biofuel conversion facility...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036924/bio-inspired-distributed-transmission-power-control-considering-qos-fairness-in-wireless-body-area-sensor-networks
#17
Chan-Jae Lee, Ji-Young Jung, Jung-Ryun Lee
Recently, the development of wireless body area sensor network (WBASN) has accelerated due to the rapid development of wireless technology. In the WBASN environment, many WBASNs coexist where communication ranges overlap with each other, resulting in the possibility of interference. Although nodes in a WBASN typically operate at a low power level, to avoid adversely affecting the human body, high transmission rates may be required to support some applications. In addition to this, since many varieties of applications exist in the WBASN environment, each prospective user may have different quality of service (QoS) requirements...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036905/extrinsic-calibration-of-camera-and-2d-laser-sensors-without-overlap
#18
Khalil M Ahmad Yousef, Bassam J Mohd, Khalid Al-Widyan, Thaier Hayajneh
Extrinsic calibration of a camera and a 2D laser range finder (lidar) sensors is crucial in sensor data fusion applications; for example SLAM algorithms used in mobile robot platforms. The fundamental challenge of extrinsic calibration is when the camera-lidar sensors do not overlap or share the same field of view. In this paper we propose a novel and flexible approach for the extrinsic calibration of a camera-lidar system without overlap, which can be used for robotic platform self-calibration. The approach is based on the robot-world hand-eye calibration (RWHE) problem; proven to have efficient and accurate solutions...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036900/toward-a-robust-security-paradigm-for-bluetooth-low-energy-based-smart-objects-in-the-internet-of-things
#19
Shi-Cho Cha, Kuo-Hui Yeh, Jyun-Fu Chen
Bluetooth Low Energy (BLE) has emerged as one of the most promising technologies to enable the Internet-of-Things (IoT) paradigm. In BLE-based IoT applications, e.g., wearables-oriented service applications, the Bluetooth MAC addresses of devices will be swapped for device pairings. The random address technique is adopted to prevent malicious users from tracking the victim's devices with stationary Bluetooth MAC addresses and accordingly the device privacy can be preserved. However, there exists a tradeoff between privacy and security in the random address technique...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036898/highly-sensitive-and-selective-hydrogen-gas-sensor-using-the-mesoporous-sno%C3%A2-modified-layers
#20
Niuzi Xue, Qinyi Zhang, Shunping Zhang, Pan Zong, Feng Yang
It is important to improve the sensitivities and selectivities of metal oxide semiconductor (MOS) gas sensors when they are used to monitor the state of hydrogen in aerospace industry and electronic field. In this paper, the ordered mesoporous SnO₂ (m-SnO₂) powders were prepared by sol-gel method, and the morphology and structure were characterized by X-ray diffraction analysis (XRD), transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET). The gas sensors were fabricated using m-SnO₂ as the modified layers on the surface of commercial SnO₂ (c-SnO₂) by screen printing technology, and tested for gas sensing towards ethanol, benzene and hydrogen with operating temperatures ranging from 200 °C to 400 °C...
October 14, 2017: Sensors
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