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Artykuły w czasopismach na temat „Multipath”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Shen, Xi Zhong, and Pan Li. "Material Flaw Sizing by Ultrasonic Multipath Detection." Advanced Materials Research 712-715 (June 2013): 1067–70. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1067.

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Sizing of material flaw is addressed in the multipath scene, and a method is developed to detect an isolated sized flaw and estimate its height based on imaging theory of different path profiles. A signal model based on the multipath higher order reflections of the flaw is built to detect the sized flaw. Multipaths are predicted and identified on the basis of the direct reflection path, which is relatively easy to be identified using the conventional flaw detection techniques. Direct reflection path and combined path are applied to detect the flaw from the top, and multipath w is to detect its

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Chen, Zhigang, Lei Wang, and Mengya Zhang. "Virtual Antenna Array and Fractional Fourier Transform-Based TOA Estimation for Wireless Positioning." Sensors 19, no. 3 (2019): 638. http://dx.doi.org/10.3390/s19030638.

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In this paper, a novel virtual antenna array and fractional Fourier transform (FRFT)-based 2-dimension super-resolution time-of-arrival (TOA) estimation algorithm for OFDM WLAN systems has been proposed. The proposed algorithm employs channel frequency responses (CFRs) at the equi-spaced positions on a line or quasi-line moving trajectory, i.e., the CFRs of a virtual antenna array, to extract multipaths’ TOA information. Meanwhile, a new chirp-like quadratic function is used to approximate the channel multipaths’ phase variation across the space dimension, which is more reasonable than the tra

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Al Mtawa, Yaser. "Enhancing Network Availability: An Optimization Approach." Computation 11, no. 10 (2023): 202. http://dx.doi.org/10.3390/computation11100202.

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High availability is vital for network operators to ensure reliable services. Network faults can disrupt functionality and require quick recovery. Multipath networking enhances availability through load balancing and optimal link utilization. However, equal-cost multipath (ECMP) routing has limitations in effectively using multipaths, decreasing network availability. This paper proposes a three-phase disjoint-path framework that improves availability by directing traffic flows through separate paths. The framework provides effective load balancing and meets various service requirements. It inc

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4

Blanza, Jojo. "Wireless Propagation Multipaths using Spectral Clustering and Three-Constraint Affinity Matrix Spectral Clustering." Baghdad Science Journal 18, no. 2(Suppl.) (2021): 1001. http://dx.doi.org/10.21123/bsj.2021.18.2(suppl.).1001.

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This study focused on spectral clustering (SC) and three-constraint affinity matrix spectral clustering (3CAM-SC) to determine the number of clusters and the membership of the clusters of the COST 2100 channel model (C2CM) multipath dataset simultaneously. Various multipath clustering approaches solve only the number of clusters without taking into consideration the membership of clusters. The problem of giving only the number of clusters is that there is no assurance that the membership of the multipath clusters is accurate even though the number of clusters is correct. SC and 3CAM-SC aimed t

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5

Sun, Junchang, Shuai Ma, Hui Zhou, Chun Du, and Shiyin Li. "Measurement and Statistical Analysis of Distinguishable Multipaths in Underground Tunnels." International Journal of Antennas and Propagation 2020 (December 2, 2020): 1–11. http://dx.doi.org/10.1155/2020/2501832.

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Compared with the line-of-sight (LOS) condition, the multipath effect is more serious in the non-line-of-sight (NLOS) condition. Therefore, the LOS and NLOS identification is necessary for the multipath analysis of signal propagation. The commonly used method is the support vector machine (SVM) method with high computational complexity. To tackle this problem, this paper adopts the SVM classifier based on fewer selected features of the normalized power delay profile (PDP). Therein, the PDP can be obtained using the sliding correlation method. The results show that the SVM-based classifier can

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6

Materum, Lawrence, and Antipas T. Teologo Jr. "An Improved K-Power Means Technique Using Minkowski Distance Metric and Dimension Weights for Clustering Wireless Multipaths in Indoor Channel Scenarios." Journal of Information and Communication Technology 20, No.4 (2021): 541–63. http://dx.doi.org/10.32890/jict2021.20.4.4.

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Wireless multipath clustering is an important area in channel modeling, and an accurate channel model can lead to a reliable wireless environment. Finding the best technique in clustering wireless multipath is still challenging due to the radio channels’ time-variant characteristics. Several clustering techniques have been developed that offer an improved performance but only consider one or two parameters of the multipath components. This study improved the K-PowerMeans technique by incorporating weights or loads based on the principal component analysis and utilizing the Minkowski distance m

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7

Yuan, Zhenhua, Chen Chen, and Ye Jin. "Erasure channel modelling–based secure bit allocation schemes for multipath routing in wireless sensor networks." International Journal of Distributed Sensor Networks 12, no. 12 (2016): 155014771668360. http://dx.doi.org/10.1177/1550147716683605.

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In this article, we study secure multipath routing with energy efficiency for a wireless sensor network in the presence of eavesdroppers. We consider two objectives: (1) the multipath routing scheme for maximising the energy efficiency with security constraints and (2) the multipath routing scheme for maximising the secrecy capacity. The binary erasure channel model is adopted to describe the wireless channel states among neighbouring nodes. Based on the binary erasure channel model, the problem of multipath routing degrades to a problem of bit allocation for each path. We formulate the proble

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8

Su, Shuqin, and Richard D. Oleschuk. "A capillary and microchip-based nanoelectrospray emitter using a mesoporous membrane." Canadian Journal of Chemistry 86, no. 11 (2008): 1055–62. http://dx.doi.org/10.1139/v08-154.

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A method is described for the fabrication of multipath electrospray emitters using hydrophobic porous polymer membranes. Polysulphone (PSF) and polycarbonate (PC) membranes, which possess pores with well-defined sizes, are glued onto the exit aperture of fused-silica capillaries or microfluidic chips to create multipaths to assist electrospray at moderate nano flow rates (e.g., 50–500 nL/min). A capillary-based multipath emitter fabricated with either PSF or PC membranes was prepared with a fused-silica capillary with 75 µm inner diameter and 360 µm outer diameter. Relative effects on electros

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9

Lee, Yongjun, and Byungwoon Park. "Nonlinear Regression-Based GNSS Multipath Modelling in Deep Urban Area." Mathematics 10, no. 3 (2022): 412. http://dx.doi.org/10.3390/math10030412.

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As the necessity of location information closely related to everyday life has increased, the use of global navigation satellite systems (GNSS) has gradually increased in populated urban areas. Contrary to the high necessity and expectation of GNSS in urban areas, GNSS performance is easily degraded by multipath errors due to high-rise buildings and is very difficult to guarantee. Errors in the signals reflected by the buildings, i.e., multipath and non-line-of-sight (NLOS) errors, are the major cause of the poor accuracy in urban areas. Unlike other GNSS major error sources, the reflected sign

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10

Hunegnaw, Addisu, and Felix Norman Teferle. "Evaluation of the Multipath Environment Using Electromagnetic-Absorbing Materials at Continuous GNSS Stations." Sensors 22, no. 9 (2022): 3384. http://dx.doi.org/10.3390/s22093384.

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To date, no universal modelling technique is available to mitigate the effect of site-specific multipaths in high-precision global navigation satellite system (GNSS) data processing. Multipaths affect both carrier-phase and code/pseudorange measurements, and the errors can propagate and cause position biases. This paper presents the use of an Eccosorb AN-W-79 microwave-absorbing material mounted around a GNSS antenna that reflects less than −17 dB of normal incident energy above a frequency of 600 MHz. To verify the feasibility and effectiveness of the Eccosorb, we installed two close stations

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11

She, Feng, Hsiao Hwa Chen, and Hongyang Li. "Joint Angular and Time Diversity of Multi-Antenna CDMA Systems in Wireless Fading Channels." International Journal of Wireless Networks and Broadband Technologies 1, no. 1 (2011): 1–14. http://dx.doi.org/10.4018/ijwnbt.2011010101.

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In this paper, a multi-antenna based receiver structure for direct sequence code division multiple access (DS/CDMA) system is proposed. The proposed scheme exploits the excellent time resolution of a CDMA RAKE receiver and uses an antenna array beamforming structure to resolve multipath returns in both angular and time domains. A much higher diversity gain than that based only on the time domain diversity can be achieved. This work suggests a new space-time diversity paradigm, namely angular-time diversity, which differs from traditional Alamouti-type space-time coded schemes. The impairments

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12

A. Rida, Jafaar Fahad. "Improvement for performance radio frequency in wireless communication based on impulse signal." Indonesian Journal of Electrical Engineering and Computer Science 18, no. 2 (2020): 903. http://dx.doi.org/10.11591/ijeecs.v18.i2.pp903-916.

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<p><span>This research presents the improved performance of mobile wireless communication channel is based on non-line of sight because the mobile propagation channel is very hard to work with direct path between the transmitter and mobile receiver because of city-based area has objects such as rise building, trees, surround structures, and other objects. The mobile wireless spread radio channels have radio propagation mechanisms as a reflection, diffraction, and scattering effect on radio signal as lessening, </span>and distortion or spread time. The most important thing to

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13

Jafaar, Fahad A. Rida. "Improvement for performance radio frequency in wireless communication based on impulse signal." Indonesian Journal of Electrical Engineering and Computer Science (IJEECS) 18, no. 2 (2020): 903–16. https://doi.org/10.11591/ijeecs.v18.i2.pp903-916.

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This research presents the improved performance of mobile wireless communication channel is based on non-line of sight because the mobile propagation channel is very hard to work with direct path between the transmitter and mobile receiver because of city-based area has objects such as rise building, trees, surround structures, and other objects. The mobile wireless spread radio channels have radio propagation mechanisms as a reflection, diffraction, and scattering effect on radio signal as lessening, and distortion or spread time. The most important thing to make real is that the wireless cha

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14

Wischik, Damon. "Multipath." Communications of the ACM 54, no. 1 (2011): 108. http://dx.doi.org/10.1145/1866739.1866761.

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15

Yang, Yiping, Chuan Chen, Yong Jia, Guolong Cui, and Shisheng Guo. "Non-Line-of-Sight Target Detection Based on Dual-View Observation with Single-Channel UWB Radar." Remote Sensing 14, no. 18 (2022): 4532. http://dx.doi.org/10.3390/rs14184532.

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Non-line-of-sight (NLOS) target detection utilizing multipath plays an important role in anti-terrorism, urban warfare, indoor rescue and intelligent driving. In this paper, an imaging method based on single-channel ultra-wideband (UWB) radar and dual-view observation is proposed for detecting NLOS targets. First, the cause of producing ghosts from a single view in a previous study is analyzed in detail. On this basis, with focusing on dual-view observation, the ghost problem is handled at two levels. From the level of the radar echo, path partition is conducted with the utilization of dual-vi

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16

Garg, Roopali, and Guneet Kaur. "Multipath Routing protocol: NCPR and QAMR." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 11, no. 10 (2013): 3065–70. http://dx.doi.org/10.24297/ijct.v11i10.2975.

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Mobile ad hoc network is an assembly of mobile nodes with no centralized server. Due to mobility of nodes and decentralized network it is difficult to maintain the quality of service (QoS) in routing the packets from source to destination.Â QoS can be defined in terms of various metrics like delay, bandwidth, packet loss, routing overhead, jitter. Routing can be unicast, multicast or multipath.Â This paper presents the description about the QoS multipath routing algorithm.

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17

Zhang, Yimin D., Xizhong Shen, Ramazan Demirli, and Moeness G. Amin. "Ultrasonic Flaw Imaging via Multipath Exploitation." Advances in Acoustics and Vibration 2012 (August 1, 2012): 1–12. http://dx.doi.org/10.1155/2012/874081.

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We consider ultrasonic imaging for the visualization of flaws in a material. Ultrasonic imaging is a powerful nondestructive testing (NDT) tool which assesses material conditions via the detection, localization, and classification of flaws inside a structure. We utilize reflections of ultrasonic signals which occur when encountering different media and interior boundaries. These reflections can be cast as direct paths to the target corresponding to the virtual sensors appearing on the top and bottom side of the target. Some of these virtual sensors constitute a virtual aperture, whereas in oth

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18

Tao, Yuan, Chao Liu, Tianyang Chen, et al. "Real-Time Multipath Mitigation in Multi-GNSS Short Baseline Positioning via CNN-LSTM Method." Mathematical Problems in Engineering 2021 (January 4, 2021): 1–12. http://dx.doi.org/10.1155/2021/6573230.

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Multipath is the main systematic error of the Global Navigation Satellite System (GNSS) short baseline positioning. Multipath cannot be eliminated by the double-differenced technique and is difficult to parameterize, which severely restrict the high-precision GNSS positioning application. Based on the spatiotemporal repeatability of multipath, the sidereal filtering in coordinate-domain (SF-CD), the sidereal filtering in observation-domain (SF-OD), and the multipath hemispherical map (MHM) can be used to mitigate the multipath in real-time. However, the multipath model with large matrix for mu

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19

Lee, Seunghwa, and Joon Yoo. "Reinforcement Learning Based Multipath QUIC Scheduler for Multimedia Streaming." Sensors 22, no. 17 (2022): 6333. http://dx.doi.org/10.3390/s22176333.

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With the recent advances in computing devices such as smartphones and laptops, most devices are equipped with multiple network interfaces such as cellular, Wi-Fi, and Ethernet. Multipath TCP (MPTCP) has been the de facto standard for utilizing multipaths, and Multipath QUIC (MPQUIC), which is an extension of the Quick UDP Internet Connections (QUIC) protocol, has become a promising replacement due to its various advantages. The multipath scheduler, which determines the path to which each packet should be transmitted, is a key function that affects the multipath transport performance. For examp

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20

Blanza, Jojo, Emmanuel Trinidad, and Lawrence Materum. "Scedasticity descriptor of terrestrial wireless communications channels for multipath clustering datasets." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 6 (2023): 6547. http://dx.doi.org/10.11591/ijece.v13i6.pp6547-6557.

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Fifth-generation (5G) wireless systems increased the bandwidth, improved the speed, and shortened the latency of communications systems. Various channel models are developed to study 5G. These channel models reproduce the stochastic properties of multiple-input multiple-output (MIMO) antennas by generating wireless multipath components (MPCs). The MPCs that have similar properties in delay, angles of departure, and angles of arrival form clusters. The multipaths and multipath clusters serve as datasets to understand the properties of 5G. These datasets generated by the Cooperation in Science a

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21

Jojo, Blanza, Trinidad Emmanuel, and Materum Lawrence. "Scedasticity descriptor of terrestrial wireless communications channels for multipath clustering datasets." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 6 (2023): 6547–57. https://doi.org/10.11591/ijece.v13i6.pp6547-6557.

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Fifth-generation (5G) wireless systems increased the bandwidth, improved the speed, and shortened the latency of communications systems. Various channel models are developed to study 5G. These channel models reproduce the stochastic properties of multiple-input multiple-output (MIMO) antennas by generating wireless multipath components (MPCs). The MPCs withsimilar properties in delay, angles of departure, and angles of arrival form clusters. The multipaths and multipath clusters serve as datasets to understand the properties of 5G. These datasets generated by the Cooperation in Science and Tec

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22

Yuan, Muzi, Du Li, Baiyu Li, Huaming Chen, and Gang Ou. "Assessment Method of Multipath Mitigation Performance for GNSS Antenna with Receiver Algorithms." International Journal of Antennas and Propagation 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/1957572.

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Multipath is one of the most important sources of positioning error in GNSS. Well-designed antennas can mitigate multipath signals and enhance the performance of GNSS receivers. This paper concentrates on methods to assess multipath mitigation performance for GNSS antennas. We propose a model to describe multipath environment in GNSS ground stations. The model analyzes effects caused by inclined reflective surfaces and multipath mitigating algorithms in receivers. A method to assess multipath mitigation performance is put forward by analyzing pseudorange code phase errors caused by multipath s

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23

Muqaibel, Ali H., Moeness G. Amin, and Fauzia Ahmad. "Target Localization with a Single Antenna via Directional Multipath Exploitation." International Journal of Antennas and Propagation 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/510720.

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Target localization in urban sensing can benefit from angle dependency of the pulse shape at a radar receiver antenna. We propose a localization approach that utilizes the embedded directivity in ultra-wideband (UWB) antennas to estimate target positions. A single radar unit sensing operation of indoor targets surrounded by interior walls is considered, where interior wall multipaths are exploited to provide target cross-range. This exploitation assumes resolvability of the multipath components, which is made possible by the virtue of using UWB radar signals. The proposed approach is most attr

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24

Zhang, Bo, Qing Wang, Wenqing Xia, Yu Sun, and Jinling Wang. "Pseudolite Multipath Estimation Adaptive Mitigation of Vector Tracking Based on Ref-MEDLL." Remote Sensing 15, no. 16 (2023): 4041. http://dx.doi.org/10.3390/rs15164041.

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Among many indoor positioning technologies, pseudolite positioning technology has become an important supplement to GNSS. In indoor open environments, pseudolite positioning technology can usually perform high-precision positioning. However, in a complex environment, the pseudolite receiver is seriously interfered by multipath and other interference signals, which will lead to a serious decline in the observation accuracy, signal lock loss or even no positioning results. Therefore, this work proposes a pseudolite indoor anti-multipath receiver based on reference multipath estimating delay lock

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25

Hui, Yong Tao, Bing Bing Li, Zhao Tong, Xing Wang Zhong, and Hao Liu. "A Short-Delay Multipath Mitigation Algorithm Based on Variable Step-Size LMS Adaptive Filtering." Applied Mechanics and Materials 571-572 (June 2014): 368–75. http://dx.doi.org/10.4028/www.scientific.net/amm.571-572.368.

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The multipath in the inter-spacecraft microwave ranging system is the short-delay multipath generally. The performance of existing multipath mitigation algorithms degrade in the short-delay scenario, and therefore an adaptive filtering algorithm based on variable step-size LMS is exploited for estimating the parameters of multipath signals. Firstly, the equation of variable step-size LMS is deduced. Then, the signals parameters are estimated recursively though the adaptive filtering algorithm. Multipath elimination is performed by substracting the estimated multipath effects from the measured

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Wang, Zhiren, Wen Chen, Danan Dong, Chenglong Zhang, Yu Peng, and Zhengqi Zheng. "An Advanced Multipath Mitigation Method Based on Trend Surface Analysis." Remote Sensing 12, no. 21 (2020): 3601. http://dx.doi.org/10.3390/rs12213601.

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Among various ways to eliminate the multipath effect in high-precision global navigation satellite system positioning, the multipath hemispherical map (MHM) is a typical multipath correction method based on spatial domain repeatability, which is suitable for not only static environments, but also some dynamic carriers, such as ships and aircraft. So, it has notable advantages and is widely used. The MHM method divides the sky into grids according to the azimuth and elevation angles of satellite, and calculates the average of the residuals within the grid points as its multipath calibration val

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Luo, Haolan, Wenqiang Zhang, Zhaoting Ren, et al. "Analysis of Electromagnetic Wave and Multipath Suppression from Overhead Perspective." Remote Sensing 15, no. 20 (2023): 4903. http://dx.doi.org/10.3390/rs15204903.

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The multipath problem in indoor target detection has always been a long-standing research hotspot. Although there are many solutions to the multipath problem in a horizontal line of sight, the multipath problem of single-station radar from an overhead perspective still needs to be solved. At present, there is a lack of detailed analysis on the multipath propagation law of electromagnetic waves from an overhead perspective. This paper first analyzes the multipath propagation law of overhead perspective and reveals a combination multipath propagation phenomenon that is easily overlooked, which i

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Guan, Yunchong, Weimin Lei, Wei Zhang, Yuzhuo Zhan, Hao Li, and Songyang Zhang. "A Multi-Dimension Spatial Method for Topology Awareness and Multipath Generating." Symmetry 11, no. 7 (2019): 870. http://dx.doi.org/10.3390/sym11070870.

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Multipath diversity significantly impacts multipath transmission quality. Enough multipath diversity would minimize the negative influence brought by an individual path, thus improving tolerance capability of network congestion and failure. However, multipath diversity is hard to guarantee on overlay networks because of inaccurate awareness of underlay network and multipath generating methods considering little about underlay diversity. In this paper, we design a multi-dimension spatial method for topology awareness and multipath generating. Analyzing that the complicated underlay networks wit

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Tamazin, Mohamed, Aboelmagd Noureldin, Michael J. Korenberg, and Ahmed M. Kamel. "A New High-Resolution GPS Multipath Mitigation Technique Using Fast Orthogonal Search." Journal of Navigation 69, no. 4 (2016): 794–814. http://dx.doi.org/10.1017/s0373463315001022.

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The Delay Locked Loop (DLL) tracking algorithm is one of the most widely used in GPS receivers. It uses different correlators such as the Early-Late Slope (ELS) correlator and High-Resolution Correlator (HRC) to mitigate code phase multipath. These techniques are effective for weak multipath environments but they may not be suitable for challenging multipath environments. The Multipath Estimating Delay Lock Loop (MEDLL) shows better performance than the classical methods. However, MEDLL still has limited capabilities in severe multipath environments. This paper introduces a robust multipath mi

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Quan, Yiming, Lawrence Lau, Gethin Wyn Roberts, Xiaolin Meng, and Chao Zhang. "Convolutional Neural Network Based Multipath Detection Method for Static and Kinematic GPS High Precision Positioning." Remote Sensing 10, no. 12 (2018): 2052. http://dx.doi.org/10.3390/rs10122052.

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Global Positioning System (GPS) has been used in many aerial and terrestrial high precision positioning applications. Multipath affects positioning and navigation performance. This paper proposes a convolutional neural network based carrier-phase multipath detection method. The method is based on the fact that the features of multipath characteristics in multipath contaminated data can be learned and identified by a convolutional neural network. The proposed method is validated with simulated and real GPS data and compared with existing multipath mitigation methods in position domain. The resu

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Jiang, Lin, Haojiang Deng, and Shoujiang Dang. "A Multipath Transmission System for Information-Centric Networking Based on Standalone Name Resolution." Applied Sciences 13, no. 7 (2023): 4195. http://dx.doi.org/10.3390/app13074195.

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Information-Centric Networking (ICN) essentially supports multipath transmission. However, current multipath schemes in ICN either necessitate major network infrastructure updates or necessitate specific network settings for terminal devices. To solve these problems, we propose MPTS-ICN, a multipath transmission system for ICN that realizes end-to-end multipath transmission. Taking the ICN architecture based on the standalone name resolution approach as a basis, MPTS-ICN is easier to implement and deploy than other ICN multipath schemes. Moreover, we have extended the original network layer pr

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Sun, Jie, Zuping Tang, Chuang Zhou, and Jiaolong Wei. "Characterization of BDS Multipath Effect Based on AT-Conv-LSTM Network." Remote Sensing 16, no. 1 (2023): 73. http://dx.doi.org/10.3390/rs16010073.

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Multipath effects are the most challenging error sources for the Global Navigation Satellite System receiver, affecting observation quality and positioning accuracy. Due to the non-linear and time-varying nature, multipath error is difficult to process. Previous studies used a homogeneous indicator to characterize multipath effects and only revealed the temporal or spatial correlations of the multipath, resulting in limited correction performance. In this study, we consider the code multipath to be influenced not only by the elevation and azimuth angle of certain stations to satellites but als

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Liu, Jun Jian, Jiu Lei Jiang, and Jiao Zhang. "Multipath Routing." Applied Mechanics and Materials 519-520 (February 2014): 288–93. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.288.

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Multipath routing can be effectively used for maximum utilization of network resources. It gives the node a choice of next hops for the same destination. We present two tree based algorithms, which we call MSPT and MBFT that can help a node to find multiple next hops for a destination. Both of them are distributed algorithm, allowing the traffic to switch off the shortest path and fully exploiting the path diversity of the network. MSPT has lower cost, while MBFT has less hops between the source and destination, end system can select next hop according to the application requirements. The simu

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Combes, Richard, Habib Sidi, and Salah Elayoubi. "Multipath Streaming." ACM SIGMETRICS Performance Evaluation Review 44, no. 1 (2016): 391–92. http://dx.doi.org/10.1145/2964791.2901485.

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Paasch, Christoph, and Olivier Bonaventure. "Multipath TCP." Queue 12, no. 2 (2014): 40–51. http://dx.doi.org/10.1145/2578508.2591369.

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Paasch, Christoph, and Olivier Bonaventure. "Multipath TCP." Communications of the ACM 57, no. 4 (2014): 51–57. http://dx.doi.org/10.1145/2578901.

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Meng, Ling Jing, Dong Li, and Hai Bo Liu. "Impact of Multipath Effect on Low-Altitude Elevation Measurement of Radar." Applied Mechanics and Materials 602-605 (August 2014): 1879–82. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.1879.

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The main impact of multipath effect on low-altitude radar measurement is elevated in this paper. The influence of multipath effect on monopulse radar measurement of elevation is analyzed. Examples suggest that the multipath error caused by the signals from pattern main lobe of radar antenna should be mainly considered in the actual project. According to the three elevation range of reflected signal entering the radar beam area, the multipath error model of elevation is established. The problem of anti-multipath interference for low-altitude target tracking with radar is solved by analyzing the

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Huang, Long, Zukun Lu, Zhibin Xiao, Chao Ren, Jie Song, and Baiyu Li. "Suppression of Jammer Multipath in GNSS Antenna Array Receiver." Remote Sensing 14, no. 2 (2022): 350. http://dx.doi.org/10.3390/rs14020350.

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Interference multipath is an important factor to affect the anti-jamming performance for the global navigation satellite system (GNSS) antenna array receiver. However, interference multipath must be considered in practical application. In this paper, the antenna array model for interference multipath is analyzed, and an equivalent model for interference multipath is proposed. According to the equivalent interference multipath model, the influence of interference multipath on anti-jamming performance is analyzed from the space only processing (SOP) and space-time adaptive processing (STAP). Int

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Visentin, Tristan, Jürgen Hasch, and Thomas Zwick. "Analysis of multipath and DOA detection using a fully polarimetric automotive radar." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (2018): 570–77. http://dx.doi.org/10.1017/s1759078718000284.

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AbstractMultipath propagation occurs in many situations of radar measurements in complex environments. The unwanted effects range from interference over the radar channels, which causes amplitude fading and a corrupted direction of arrival (DOA) estimation, to the detection of ghost targets in an angle of arrival of the multipath direction. Due to the different number of reflections, polarimetric radars are capable to separate certain multipaths from direct paths if the target is known in advance. Furthermore, it is possible to separate objects with different polarimetric features in DOA that

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Ng, Benjamin K., and Chan-Tong Lam. "Single-Carrier Rotation-Interleaved Space-Time Code for Frequency-Selective Fading Channels." Applied Sciences 12, no. 24 (2022): 12803. http://dx.doi.org/10.3390/app122412803.

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A novel single-carrier-based space-time code construction scheme to exploit the advantages of a frequency-selective fading channel is investigated in this paper. The proposed construction scheme is based on multiplexing independent streams of phase-rotated space-time codes in a time-interleaved fashion. The advantage of such design is that it guarantees full space-time-multipath diversity by using traditional space-time codes or MIMO signaling schemes originally designed for flat fading channels as the constituent codes. Another advantage is that this approach incurs no loss in bandwidth effic

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Xiao, Ling, Changzhe Si, Xin Ye, Bangshuang Zhang, Gang Qin, and Yue Bai. "A multipath migration method for common clock source SDCP observation using polynomial fitting technique." Journal of Physics: Conference Series 2253, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2253/1/012009.

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Abstract The multipath error is the major error source for high precision positions. One sidereal filtering multipath migration method is proposed for single difference carrier phase(SDCP) measurement based on polynomial fitting technique. The multipath error prediction is estimated by constructing a piecewise polynomial function based on polynomial fitting of one sidereal period multipath errors. Then the multipath error of the measurement is eliminated by subtracting the corresponding prediction. The effectiveness of the proposed method was verified by field experiments. The experimental res

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So, Hyoungmin, Ghangho Kim, Taikjin Lee, Sanghoon Jeon, and Changdon Kee. "Modified High-Resolution Correlator Technique for Short-Delayed Multipath Mitigation." Journal of Navigation 62, no. 3 (2009): 523–42. http://dx.doi.org/10.1017/s037346330900530x.

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Multipath is one of the main error sources in global navigation satellite system (GNSS) positioning. The high-resolution correlator (HRC) is a multipath mitigation technique well known for its outstanding performance for mid-delayed multipath, but still has a remaining error for the short-delayed multipath. This paper proposes a modified HRC scheme that can remove or reduce the error for short-delayed multipath signals. It estimates the HRC tracking error and augments the conventional HRC with the estimates. The method was implemented with a software receiver and the test results show short-de

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Sravanthi, P., and D. Venkata Ratnam. "Multipath Mitigation Technique Based on Successive Variational Mode Decomposition Using NAVIC Receiver Data." Applied Mechanics and Materials 926 (April 23, 2025): 113–23. https://doi.org/10.4028/p-nyuo1o.

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Multipath interference poses a significant challenge in satellite-based navigation systems, including NAVIC (Navigation with Indian Constellation), degrading the accuracy of position estimates. This study proposes a comprehensive approach to address multipath errors in NavIC receivers, combining multipath error calculation using the code minus carrier method with multipath reduction through mode decomposition techniques EMD- empirical mode decomposition, VMD-variational mode decomposition, and SVMD-successive variational mode decomposition. Data was collected from a NavIC receiver located at K

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Li, Qianxia, Linyuan Xia, Ting On Chan, et al. "Intrinsic Identification and Mitigation of Multipath for Enhanced GNSS Positioning." Sensors 21, no. 1 (2020): 188. http://dx.doi.org/10.3390/s21010188.

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In global navigation satellite system (GNSS)-based positioning and applications, multipath is by far the most obstinate impact. To overcome paradoxical issues faced by current processing approaches for multipath, this paper employs an intrinsic method to identify and mitigate multipath based on empirical mode decomposition (EMD) and Hilbert–Huang transform (HHT). Frequency spectrum and power spectrum are comprehensively employed to identify and extract multipath from complex data series composed by combined GNSS observations. To systematically inspect the multipath from both code range and car

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Hu, Yili, Yongbo Zhao, and Sheng Chen. "Incoherent Integration Detection Method of Airborne Phased Array Radar in a Multipath Environment." International Journal of Antennas and Propagation 2021 (December 15, 2021): 1–10. http://dx.doi.org/10.1155/2021/8699512.

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Airborne phased array radar (PAR) suffers from multipath problems when flying over a calm sea surface. The existence of a multipath phenomenon will cause the electromagnetic echo of the same target to be reflected back to the airborne PAR from two paths, namely, direct path (DP) and multipath. Compared with the ground-based radar, the target echo received by airborne PAR in the multipath environment has two important characteristics: one is that the DP signal and the multipath signal exist in different range bins, and the other is that the radar cross section (RCS) in the DP direction may be s

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Hu, Bin, Xueyong Shen, Min Jiang, and Kaiheng Zhao. "Off-Grid DOA Estimation Based on Compressed Sensing on Multipath Environment." International Journal of Antennas and Propagation 2023 (April 10, 2023): 1–6. http://dx.doi.org/10.1155/2023/9315869.

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Due to the existence of multipath propagation, the array will receive the multipath propagation signals at the same time while receiving the target signal and the performance of directional of arrival (DOA) estimation will be influenced. In this paper, an off-grid DOA estimation technique based on compressed sensing (CS) on multipath environment is proposed. To deal with the off-grid problem and the multipath propagation problem, we present a compressed sensing based method. This method regards the multipath propagation coefficients vector as a superparameter and the grid as an adjustable para

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Lin, Yun, Ziwei Tian, Yanping Wang, Yang Li, Wenjie Shen, and Zechao Bai. "Enhancing SAR Multipath Ghost Image Suppression for Complex Structures through Multi-Aspect Observation." Remote Sensing 16, no. 4 (2024): 637. http://dx.doi.org/10.3390/rs16040637.

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When Synthetic Aperture Radar (SAR) observes complex structural targets such as oil tanks, it is easily interfered with by multipath signals, resulting in a large number of multipath ghost images in the SAR image, which seriously affect the image clarity. To address this problem, this paper proposes a multi-aspect multipath suppression method. This method observes complex structural targets from different azimuth angles to obtain a multi-aspect image sequence and then uses the difference in sequence features between the target image and the multipath ghost image with respect to aspect angle to

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Lu, Bo, Jian Ping Jin, Wen Yi Duan, Liang Jin Chen, and Hong Ye Guan. "Research of GPS Signal Multipath Effects Based on GAMIT TRACK." Advanced Materials Research 588-589 (November 2012): 912–19. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.912.

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GPS multipath disturbance is a bottleneck problem that limits accuracy of GPS positioning. The function of single epoch kinematic positioning of GAMIT TRACK is used to study GPS signal multipath effects. A filtering method for separating signal and noise based on the wavelet analysis is established. The decomposition level for wavelet filter is confirmed according to the high correlation of the multipath effects between adjacent sidereal days by using the maximum correlation coefficient method. The accurate multipath corrections in GPS coordinate series are acquired with the proposed method ma

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Gajanada, I. Gede Arya Gangga, Nyoman Pramaita, and I. Gusti Agung Komang Diafari Djuni Hartawan. "Design of Orthogonal Variable Spreading Factor (OVSF) Performance Simulation Program in Multipath Fading Channels." Journal of Electrical, Electronics and Informatics 4, no. 2 (2020): 64. http://dx.doi.org/10.24843/jeei.2020.v04.i02.p05.

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The characteristics of wireless channel are determined by multipath propagation. The transmitted signal will be scattered so that it produces fading. Fading influenced by multipath component will cause delay spread which damages the signal. Thus, spread spectrum technology is used by using a bandwidth that is greater than the original signal. The objective of this study was to determine the effect of the number of multipath components on orthogonal variable spreading factor (OVSF) codes on multipath fading channels viewed from values and Bit Error Rate (BER) graphs versus Energy Bits per Noise

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Zhang, Qiuzhao, Longqiang Zhang, Ao Sun, Xiaolin Meng, Dongsheng Zhao, and Craig Hancock. "GNSS Carrier-Phase Multipath Modeling and Correction: A Review and Prospect of Data Processing Methods." Remote Sensing 16, no. 1 (2024): 189. http://dx.doi.org/10.3390/rs16010189.

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A multipath error is one of the main sources of GNSS positioning errors. It cannot be eliminated by forming double-difference and other methods, and it has become an issue in GNSS positioning error processing, because it is mainly related to the surrounding environment of the station. To address multipath errors, three main mitigation strategies are employed: site selection, hardware enhancements, and data processing. Among these, data processing methods have been a focal point of research due to their cost-effectiveness, impressive performance, and widespread applicability. This paper focuses

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