Bibliografie tematiche / TDOA

Indice

Articoli di riviste
Tesi
Libri
Capitoli di libri
Atti di convegni
Rapporti di organizzazioni

Letteratura scientifica selezionata sul tema "TDOA"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 9 giugno 2025

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "TDOA".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "TDOA"

Chen, Xiang, Yuheng Chen, Shuai Cao, Lei Zhang, Xu Zhang, and Xun Chen. "Acoustic Indoor Localization System Integrating TDMA+FDMA Transmission Scheme and Positioning Correction Technique." Sensors 19, no. 10 (May 22, 2019): 2353. http://dx.doi.org/10.3390/s19102353.

Testo completo

Abstract (sommario):

This paper presents a novel audio indoor localization system. In the proposed system, four speakers placed at known positions transmit chirp signals according to the time-division multiple access (TDMA) plus frequency-division multiple access (FDMA) transmission scheme. A smartphone receives the signal via a built-in microphone and calculates the time differences of arrival (TDOAs). Using TDOA measurements, the position is estimated by the shrinking-circle method. In particular, to reduce the positioning error in moving conditions, a TDOA correction method based on Doppler shifts is proposed. The performance of the proposed system was evaluated in real-world experiments using a 10.971 m × 5.684 m positioning area. The results of the static-target positioning experiment showed that the TDMA+FDMA transmission scheme has more advantages in improving the update rate of the positioning system than the TDMA-only transmission scheme. The results of the moving-target positioning experiment under three different speeds demonstrated that the positioning errors were reduced by about 10 cm when the Doppler-shift-based TDOA correction method was adopted. This research provides a possible framework for the realization of a TDOA-chirp-based acoustic indoor positioning system with high positioning accuracy and update rate.

Gli stili APA, Harvard, Vancouver, ISO e altri

Luo, Ji-An, Zhi-Wen Tan, and Dong-Liang Peng. "A novel bearing-assisted TDOA-GROA approach for passive source localization." International Journal of Intelligent Computing and Cybernetics 11, no. 1 (March 12, 2018): 2–19. http://dx.doi.org/10.1108/ijicc-11-2016-0056.

Testo completo

Abstract (sommario):

Purpose The passive source localization (PSL) problem using angles of arrival (AOA), time differences of arrival (TDOA) or gain ratios of arrival (GROA) is generally nonlinear and nontrival. In this research, the purpose of this paper is to design an accurate hybrid source localization approach to solve the PSL problem. The inspiration is drawn from the fact that the bearings, TDOAs and GROAs are complementary in terms of their geometry properties. Design/methodology/approach The maximum-likelihood (ML) method is reexamined by using hybrid measurements. Being assisted by the bearings, a new hybrid weighted least-squares (WLS) method is then proposed by jointly utilizing the bearing, TDOA and GROA measurements. Findings Theoretical performance analysis illustrates that the mean-square error of the ML or WLS method can attain the Cramér-Rao lower bound for Gaussian noise over small error region. However, the WLS method has much lower computational complexity than the ML algorithm. Compared with the AOA-only, TDOA-only, AOA-TDOA, TDOA-GROA methods, the localization accuracy can be greatly improved by combining the AOAs, TDOAs and GROAs, especially for some specific geometries. Originality/value A novel bearing-assisted TDOA-GROA method is proposed for source localization, and a new hybrid WLS estimator is presented inspired from the fact that the bearings, TDOAs and GROAs are complementary in terms of their geometry properties.

Gli stili APA, Harvard, Vancouver, ISO e altri

Ouyang, Xinxin, Shanfeng Yao, and Qun Wan. "A Coherent Integrated TDOA Estimation Method for Target and Reference Signals." Electronics 11, no. 16 (August 22, 2022): 2632. http://dx.doi.org/10.3390/electronics11162632.

Testo completo

Abstract (sommario):

The performance of a time difference of arrival (TDOA) localization system is severely affected by time synchronization errors, and making use of reference signals is a common solution for the problem. The traditional method has two steps, first to measure the TDOAs of the target signal and reference signal separately, and next, to compensate the estimated target TDOA with the difference of the estimated reference TDOA and the true reference TDOA. Since the performance of the TDOA estimation is mainly decided by the frequency information, a coherent integration TDOA estimation method for the target signal and reference signal is proposed in this paper, based on cross correlation phase difference compensation, with use of the signals’ frequencies. First, as per the traditional method, the separated cross correlation functions of the target signal and reference signal were obtained by cross correlation, and the target TDOA and reference TDOA of the separate method were estimated. Next, the cross correlation phase was analyzed for each signal. Then the coherent integration cross correlation was obtained with phase compensation, from which the estimation of the target TDOA and reference TDOA could simultaneously be achieved. We performed simulation comparisons with the two methods, and showed that the proposed algorithm provided better performance.

Gli stili APA, Harvard, Vancouver, ISO e altri

Wada, Atsushi, and Shingo Yoshizawa. "Transmission of Depth Data by Pulse Position Modulation for Underwater Acoustic Positioning Systems." International Journal of Circuits, Systems and Signal Processing 16 (May 30, 2022): 999–1006. http://dx.doi.org/10.46300/9106.2022.16.122.

Testo completo

Abstract (sommario):

This paper presents a three dimensional localization method for underwater acoustic positioning systems. In typical ultra-short baseline (USBL) acoustic positioning systems, the three dimensional position is localized by using multiple time difference of arrivals (TDOAs). Since the TDOA accuracy is less than the other sensor data, we focus on a localization method with the minimum number of TDOA. We propose a method of transmitting depth data by pulse position modulation (PPM), where the target position is localized by a single TDOA, a distance, and a depth. The proposed method shows a higher positional accuracy than the conventional method with two TDOAs. The effectiveness of the proposed method has been demonstrated in the evaluation of simulation and experiment.

Gli stili APA, Harvard, Vancouver, ISO e altri

Wang, Shanhe, Yu Xiang, Yuanyuan Gao, Yu Hua, Changjiang Huang, and Xian Zhao. "The Time Difference of Arrival Estimation Method Utilizing an Inexact Reconstruction Within the Framework of Compressed Sensing." Remote Sensing 16, no. 21 (October 30, 2024): 4039. http://dx.doi.org/10.3390/rs16214039.

Testo completo

Abstract (sommario):

The time difference of arrival (TDOA) estimation plays a crucial role in emitter localization and time synchronization applications. When time among multiple sensors is synchronized, the TDOAs between the sensors and the emitter can be measured to achieve hyperbolic positioning of the emitter. Conversely, if the positions of both the sensors and the emitter are known, TDOAs can be utilized to synchronize the clocks across the sensors. Given that compressed sensing (CS) can reduce both the sampling rate and data volume, thereby enhancing the efficiency of TDOA estimation, there has been growing interest among researchers in exploring TDOA estimation within the CS framework. In scenarios such as passive positioning, the signals received by sensors are often non-cooperative, and the underlying signal system is unknown, making it difficult to obtain a sparse representation of the signal. This paper introduces an incomplete reconstruction-based TDOA estimation method along with an improved variant. By selecting a partial Fourier transform matrix as the measurement matrix and a Fourier transform matrix as the projection matrix, the orthogonal matching pursuit (OMP) algorithm is employed to reconstruct the compressed measurement data. Through subsequent processing steps, such as conjugate mirroring, TDOA estimation between two signals can be performed. Although the reconstructed signal may substantially differ from the original, the accuracy of TDOA estimation remains reliable. Simulation results demonstrate that when the signal-to-noise ratio (SNR) of the received signal is at least 0 dB and the compressed sampling length exceeds one-tenth of the original signal length, the TDOA estimation error of the proposed method is nearly identical to that of the cross-correlation method.

Gli stili APA, Harvard, Vancouver, ISO e altri

Xue, Jie, Binbin Su, Yongcai Liu, and Jin Meng. "A Multi-Receiver Pulse Deinterleaving Method Based on SSC-DBSCAN and TDOA Mapping." Electronics 14, no. 9 (April 29, 2025): 1833. https://doi.org/10.3390/electronics14091833.

Testo completo

Abstract (sommario):

Deinterleaving pulses of various pulse repetition interval (PRI) modulation modes constitute a vital and challenging task for an electronic measures system (ESM). A deinterleaving method based on multi-receiver time-difference-of-arrival (TDOA) is proposed in this paper. Firstly, this paper theoretically analyzes the distribution feature of TDOA, providing the basis of deinterleaving. Then, a SSC (Sorting Skipping Clustering)-DBSCAN algorithm is proposed to achieve TDOA clustering by pre-sorting and traversing key points, which reduces the computational complexity. The TDOA mapping algorithm is further proposed to separate pulses and eliminate Cross-Pulse TDOAs simultaneously based on a one-time clustering result, which can significantly decrease the false alarm rate while avoiding clustering TDOA repeatedly. Simulation results show that the proposed method is capable of deinterleaving pulses of various PRI modulation modes and the performance remains excellent under multiple parameter settings. The running time and the false alarm rate have been reduced by at least 66% and 17%, respectively, compared with the existing methods.

Gli stili APA, Harvard, Vancouver, ISO e altri

Deng, Wang, Zheng, Fu, Yin, Tang, and Yang. "A Closed-Form Localization Algorithm and GDOP Analysis for Multiple TDOAs and Single TOA Based Hybrid Positioning." Applied Sciences 9, no. 22 (November 16, 2019): 4935. http://dx.doi.org/10.3390/app9224935.

Testo completo

Abstract (sommario):

Cellular communication systems support mobile phones positioning function for Enhanced-911 (E-911) location requirements, but the positioning accuracy is poor. The fifth-generation (5G) cellular communication system can use indoor distribution systems to provide accurate multiple time-difference-of-arrival (TDOA) and single time-of-arrival (TOA) measurements, which could significantly improve the indoor positioning ability. Unlike iterative localization algorithms for TDOA or TOA, the existing closed-form algorithms, such as the Chan-Ho algorithm, do not have convergence problems, but can only estimate position based on one kind of measurement. This paper proposes a closed-form localization algorithm for multiple TDOAs and single TOA measurements. The proposed algorithm estimates the final position result using three-step weighted least squares (WLSs). The first WLS provides an initial position for the last two steps. Then the algorithm uses two WLSs to estimate position based on heteroscedastic TDOA and TOA measurements. In addition, the geometric dilution of precision (GDOP) of the proposed hybrid TDOA and TOA positioning has been derived. The analysis of GDOP shows that the proposed hybrid positioning has lower GDOP than TDOA-only positioning, which means the proposed hybrid positioning has a higher accuracy limitation than TDOA-only positioning. The simulation shows that the proposed localization algorithm could have better performance than closed-form TDOA-only positioning methods, and the positioning accuracy could approximate Cramer-Rao lower bound (CRLB) when the TDOA measurement errors are small.

Gli stili APA, Harvard, Vancouver, ISO e altri

IBRAHIM, NUR. "Pendeteksian Lokasi Sumber Noise (Partial Discharge) secara Tiga Dimensi menggunakan Antenna Array." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 3, no. 2 (July 1, 2015): 106. http://dx.doi.org/10.26760/elkomika.v3i2.106.

Testo completo

Abstract (sommario):

ABSTRAKPada penelitian ini akan dilakukan simulasi teknik pendeteksian lokasi sumber noise berupa partial discharge (PD) pada peralatan tegangan tinggi, dengan menggunakan susunan antena yang terdiri dari empat buah antena monopole sebagai sensor untuk mendeteksi gelombang elektromagnetik (EM) yang dipancarkan dari partial discharge (PD). Algoritma yang digunakan mengacu kepada time difference of arrival (TDOA) dari sinyal yang diterima antar antena (dengan menjadikan salah satu antena sebagai antena referensi). Metode yang digunakan untuk menentukan TDOA adalah metode Akaike Information Criterion, metode Energy Criterion, metode Gabor Centroid, metode threshold detection, metode peak detection, dan metode cross-correlation. Sistem pendeteksian lokasi sumber noise ini menggunakan konfigurasi susunan antena membentuk Y. Jarak antar antena diatur sejauh 2 meter dan 4 meter. Berdasarkan hasil pengamatan dan analisis, konfigurasi susunan antena membentuk Y memiliki tingkat akurasi 97.67%. Metode yang paling akurat untuk menentukan TDOA adalah metode cross-correlation.Kata kunci: PD, TDOA, susunan antena.ABSTRACTThis paper presents a simulation of locating noise source (Partial Discharge) on high-voltage apparatuses, by using antenna array that consisted of four monopole antennas as sensor to record the electromagnetic waves (EM) emitted from Partial Discharge (PD). The detection algorithm is based on the time difference of arrival (TDOA) of the signals received between antennas (by using one of four antennas as reference antenna). The methods to determine TDOAs are Akaike Information Criterion method, Energy Criterion method, Gabor Centroid method, threshold detection method, peak detection method, and/or cross-correlation method. These system use Y-shaped array configuration. The adjusted distance between antennas are 2 meter and 4 meter. From the observation and analysis results, Y-shaped array antenna configuration has accuracy 97.76%. The best method to get TDOA is the cross-correlation method.Keywords: PD, TDOA, antenna array.

Gli stili APA, Harvard, Vancouver, ISO e altri

Yuk, Simun, and Youngho Cho. "A Time-Based Dynamic Operation Model for Webpage Steganography Methods." Electronics 9, no. 12 (December 10, 2020): 2113. http://dx.doi.org/10.3390/electronics9122113.

Testo completo

Abstract (sommario):

The webpage steganography technique has been used for a covert communication method for various purposes in which a sender embeds a secret message into a plain webpage file like an HTML file by using various steganography methods. With human eyes, it is very difficult to distinguish between the original webpage (cover webpage) and the modified webpage with the secret data (stego webpage) because both are displayed alike in a web browser. In this approach, when two communicating entities want to share a secret message, a sender uploads a stego webpage to a web server or modifies an existing webpage in the web server by using a webpage steganography method, and then a receiver accesses the stego webpage to download and extract the embedded secret data from it. Meanwhile, according to our extensive survey, we observed that most webpage steganography methods focused on proposing or improving steganography algorithms but did not well address how to operate a stego webpage as time passes. However, if a stego webpage is used in a static way such that the stego webpage does not change and is constantly exposed to web clients until the sender removes it, such a static operation approach will limit or badly affect the hiding capacity and undetectability of a webpage steganography method. By this motivation, in this paper, we proposed a time-based dynamic operation model (TDOM) that improves the performance of existing webpage steganography methods in terms of hiding capacity and undetectability by dynamically replacing the stego webpage with other stego webpages or the original webpage. In addition, we designed two time-based dynamic operation algorithms (TDOA-C and TDOA-U), which improve the hiding capacity of existing methods and TDOA-U for improving the undetectability of existing methods, respectively. To validate our model and show the performance of our proposed algorithms, we conducted extensive comparative experiments and numerical analysis by implementing two webpage steganography methods with our TDOM (CCL with TDOA-C and COA with TDOA-C) and tested them in the web environment. According to our experiments and analysis, our proposed algorithms could significantly improve the hiding capacity and undetectability of two existing webpage steganography methods.

Gli stili APA, Harvard, Vancouver, ISO e altri

Liu, Yan, and Fucheng Guo. "Fast TDOA and FDOA Estimation for Coherent Pulse Signals." International Journal of Antennas and Propagation 2022 (September 20, 2022): 1–9. http://dx.doi.org/10.1155/2022/5390970.

Testo completo

Abstract (sommario):

Time difference of arrival (TDOA) and frequency difference of arrival (FDOA) have been widely used for localizing temporally continuous signals passively. Temporal sparsity of pulse signals makes their TDOA and FDOA estimation processes much different, and computational complexity is a major concern in this area. This paper addresses the problem of fast TDOA and FDOA estimation of pulse signals and focuses mainly on narrowband coherent pulses. By decoupling the effects of TDOA and FDOA in the cost function of localization approximately, we propose a fast coarse TDOA and FDOA estimation method. The estimates are then refined with the cross-ambiguity function (CAF) algorithm within a small TDOA and FDOA neighborhood. In the simulations, the proposed method is demonstrated to have satisfying TDOA and FDOA estimation precisions, and it exceeds existing counterparts largely in computational efficiency.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Tesi sul tema "TDOA"

Bennett, Granger Hart. "Acoustic transient TDOA estimation and discrimination." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384321.

Testo completo

Abstract (sommario):

Thesis (M.S. in Electrical Engineering and M.S. in Engineering Acoustics) Naval Postgraduate School, September 2000. Thesis advisor(s): Therrien, Charles W. ; Tummala, Murrali ; Smith, Kevin B. "September 2000." Includes bibliographical references (p. 57-58). Also available online.

Gli stili APA, Harvard, Vancouver, ISO e altri

Arbring, Joel, and Patrik Hedström. "On Data Compression for TDOA Localization." Thesis, Linköping University, Information Coding, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57274.

Testo completo

Abstract (sommario):

This master thesis investigates different approaches to data compression on common types of signals in the context of localization by estimating time difference of arrival (TDOA). The thesis includes evaluation of the compression schemes using recorded data, collected as part of the thesis work. This evaluation shows that compression is possible while preserving localization accuracy.The recorded data is backed up with more extensive simulations using a free space propagation model without attenuation. The signals investigated are flat spectrum signals, signals using phase-shift keying and single side band speech signals. Signals with low bandwidth are given precedence over high bandwidth signals, since they require more data in order to get an accurate localization estimate.The compression methods used are transform based schemes. The transforms utilized are the Karhunen-Loéve transform and the discrete Fourier transform. Different approaches for quantization of the transform components are examined, one of them being zonal sampling.Localization is performed in the Fourier domain by calculating the steered response power from the cross-spectral density matrix. The simulations are performed in Matlab using three recording nodes in a symmetrical geometry.The performance of localization accuracy is compared with the Cramér-Rao bound for flat spectrum signals using the standard deviation of the localization error from the compressed signals.

Gli stili APA, Harvard, Vancouver, ISO e altri

Humpherys, Brian. "SIGNAL TDOA BASED HIGH RESOLUTION TSPI." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608843.

Testo completo

Abstract (sommario):

International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California This paper describes a method for determining high resolution time, space, and position information for a test range flight vehicle using four tracking receivers. Equipped with GPS time systems, each receiver records the exact time at which a time marker embedded in the transmitted TM data stream is received. With this information, the time difference of arrival for the time markers at three of the receivers can be calculated referenced to the fourth. Using this time difference, the position of the transmitter can be determined. The accuracy with which the received signal time delay can be calculated depends on the accuracy of the GPS time system at each receiver. The effect of time accuracy on positional resolution is evaluated.

Gli stili APA, Harvard, Vancouver, ISO e altri

Nan, Xie, and Zhang Futang. "Performance Analysis of Reentry TDOA Positioning System." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606140.

Testo completo

Abstract (sommario):

ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada In reentry measurement, we need to measure the track of reentry vehicle. For the speed of target is very high, it is difficult for traditional positioning system to capture and track the target. TDOA (time difference of arrival) positioning system is used in reentry measurement. The position of target is calculated by using time difference of arrival. This paper introduces the principle of reentry TDOA positioning system. The key technology is synchronization of ground stations' clocks. The implementation of clock synchronization using low-cost commercial GPS receiver is presented. The sources of errors in the existing telemetry system, corresponding precision and experimental results are presented. Some methods, which are used to improve the precision, are proposed at the end of this paper.

Gli stili APA, Harvard, Vancouver, ISO e altri

Kovavisaruch, La-or. "Source localization using TDOA with erroneous receiver positions." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/6278.

Testo completo

Abstract (sommario):

Thesis (Ph. D.)--University of Missouri-Columbia, 2005. The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 22, 2006) Vita. Includes bibliographical references.

Gli stili APA, Harvard, Vancouver, ISO e altri

Bressner, Thomas Arthur Herbert. "Development and Evaluation of UTDoAas a Positioning Method in LTE." Thesis, KTH, Signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176499.

Testo completo

Abstract (sommario):

Although positioning has been one of the main target study areas in mobile communication in the last decade, it still receives strong attention in recent years focusing more on the indoor users. Nowadays, a wide range of different methods are available to estimate the position of the target user under certain circumstances. One of these methods is Uplink Time Difference of Arrival (UTDoA), which has been defined in 3GPP Release 11 for Long Term Evolution (LTE) networks, and is the focus of this master thesis. In Uplink based positioning, to estimate the position of a User Equipment (UE), the UE only needs to generate and transmit the reference signal and the main computational effort of time estimation, is moved from the UE towards the network side. This might be one advantage compared to Observed Time Difference of Arrival (OTDoA), while further performance properties of UTDoA in LTE are investigated in the course of this master thesis. In parallel with the 3GPP Study Item on Indoor Positioning which mainly was based on downlink OTDoA, this thesis studies on the potential use of UTDoA in LTE under the same type of agreed deployment scenarios and simulation parameters. For time estimation based on the Sounding Reference Signals (SRSs), the uplink channel has been modeled and simulated. Finally, the position estimation of the UE is derived by multilateration techniques using the time/distance estimations of the received SRS at each eNodeB. The metrics of positioning results are based on Cumulative Distribution Functions (CDF) of horizontal and vertical positioning error. The study shows that reasonable horizontal position accuracy can be achieved, while a number of pico cells are added to the network to enhance the macro-only scenario. However, this positive effect could not be observed in vertical position estimation. A further investigated aspect is the influence by other active UEs considered as interference. The outcome shows, that the accuracy is strongly and negatively affected by introducing interference. A final observation focuses on the SRS bandwidth and that for bandwidths below 10 MHz additional degradations in performance are seen. Trots att positionering har varit ett av huvudmålen för forskning inom mobil kommunikation under det senaste decenniet, får det fortfarande mycket uppmärksamhet och under de senaste åren har forskningen fokuserats mer på inomhusanvändare. Idag finns en mängd olika metoder för att estimera positionen för en specifik användare under vissa omständigheter. En av dessa metoder är Uplink Time Difference of Arrival (UTDoA) som har definierats i 3GPP Release 11 för Long Term Evolution (LTE)-nätverk och är fokus för detta examensarbete. I positionering baserad på upplänken, vilken används för att skatta positionen för en User Equipment (UE), behöver UE:n bara generera och sända en referenssignal och den huvudsakliga beräkningskraften för tidsestimeringen flyttas från UE:n till nätsidan. Detta kan vara en fördel jämfört med Observed Time Difference of Arrival (OTDoA), detta examensarbete undersöker ytterligare prestandaegenskaper hos UTDoA i LTE. Parallellt med 3GPP:s studie för inomhuspositionering, som huvudsakligen baseras på nerlänk OTDoA, studerar denna avhandling den potentiella användningen av UTDoA i LTE med samma typ av överenskomna scenarier och simuleringsparametrar. För tidsuppskattning baserad på Sounding Reference Signals (SRSs) har kanalen upplänkmodellerats och simulerats. Slutligen är positionsestimeringen av UE:n härledd genom multilaterationstekniker med hjälp av tids- och distansestimeringar av de mottagna SRS vid varje eNodeB. De mått som används för positioneringsresultat baseras på kumulativ fördelningsfunktion av det horisontella och vertikala positioneringsfelet. Studien visar att en rimlig noggrannhet kann uppnås i den horisontella dimensionen då ett antal pico-celler adderas till nätverket för att förbättra makroscenariot. Denna positiva effekt kunde emellertid inte observeras i den vertikala positionsestimeringen. En ytterligare undersökt aspekt är påverkan av andra aktiva UEs, som betraktas som interferens. Resultaten visar att noggrannheten är starkt negativt påverkad då störningar i form av interferens införs. En slutlig observation fokuserar på bandbredden av SRS och det visar på försämringar i prestanda för bandbredder under 10 MHz.

Gli stili APA, Harvard, Vancouver, ISO e altri

Basciftci, Cagri Halis. "Direction Finding With Tdoa In A Multipath Land Environment." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608756/index.pdf.

Testo completo

Abstract (sommario):

In this thesis, the problem of Angle of Arrival estimation of radar signals with Time Difference of Arrival method in an outdoor land multipath environment with limited line of sight is analyzed. A system model is proposed. Effects of system, channel and radar parameters on the Angle of Arrival estimation performance are investigated through Monte Carlo simulations. Improving effect of utilization of diversity on the estimation performance is observed. Performances of the space diversity with noncoherent and selective combining are compared. Finally a realistic scenario is studied and performance of the proposed system is investigated.

Gli stili APA, Harvard, Vancouver, ISO e altri

Li, Binghao Surveying &amp Spatial Information Systems Faculty of Engineering UNSW. "Terrestial mobile user positioning using TDOA and fingerprinting techniques." Awarded by:University of New South Wales. School of Surveying and Spatial Information Systems, 2006. http://handle.unsw.edu.au/1959.4/25507.

Testo completo

Abstract (sommario):

Specialists are expecting the knowledge of location will trigger yet another revolution in mobile services. Location-base services (LBS) have attracted many researchers and enterprises and one of the key aspects of LBS is positioning technology. Considering a wider and more complex field - ubiquitous computing, location is the fundamental element. This work focuses on some aspects of the new techniques of terrestrial positioning systems. Wireless LAN is one of the most popular systems used for positioning for indoor environments and public places. We have investigated the trilateration and fingerprinting approaches and the results showed the advantages of fingerprinting. A novel method to generate the fingerprints database based on Universal Kriging (UK) was developed, which can not only significantly decrease the training time, but also increase the accuracy of estimates. In mobile phone positioning systems, most techniques suffer from the non-line-of-sight (NLOS) propagation. We investigated the specifics of NLOS error, and proposed a method to mitigate the errors. Furthermore, a new algorithm named WSMM (wireless signal map matching) was discussed. Simulations and experiments verified the idea, and the accuracy of positioning can be improved greatly. Since fingerprinting technique can utilize rather than suffer from the NLOS propagation, it was also applied in mobile phone positioning system. Experiments showed both the deterministic approach and probabilistic approach can provide better results comparing with other techniques in suburban area. To achieve a robust positioning system and provide more useful information of the user, multisensor combination and data fusion are necessary. As the first step of future research, a mulitsensor synchronization system was developed. This system can promisingly achieve synchronization with error less than 0.4 ms, which is suitable for most land applications. Hence the main findings of this thesis are: (1) a novel method of yielding fingerprint database for both wireless LAN (WLAN) and mobile phone systems when using the fingerprinting technique for positioning; (2) a database method to mitigate NLOS error for mobile phone positioning systems; (3) a low cost synchronization system for integration of multiple sensors.

Gli stili APA, Harvard, Vancouver, ISO e altri

KATAYAMA, Masaaki, Takaya YAMAZATO, and Jan Mateusz KIETLINSKI-ZALESKI. "TDoA UWB Positioning with Three Receivers Using Known Indoor Features." IEEE, 2010. http://hdl.handle.net/2237/14480.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Aktas, Unal. "Time difference of arrival (TDOA) estimation using wavelet based denoising." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA360774.

Testo completo

Abstract (sommario):

Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, March 1999. "March 1999" Thesis advisor(s): David V. Lamm, Michael W. Boudreau. Includes bibliographical references (p. 103-104). Also available online.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Libri sul tema "TDOA"

Bennett, Granger Hart. Acoustic transient TDOA estimation and discrimination. Monterey, Calif: Naval Postgraduate School, 2000.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Haney, Timothy N. Generation of Global System for Mobile (GSM) signals and their Time Difference of Arrival (TDOA) estimation. Monterey, Calif: Naval Postgraduate School, 2000.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

G, Glisic Savo, and Leppänen Pentti A, eds. Wireless communications: TDMA versus CDMA. Boston: Kluwer Academic Publishers, 1997.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Glisic, Savo G. Wireless Communications: TDMA versus CDMA. Boston, MA: Springer US, 1997.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Coursey, Cameron. Understanding digital PCS: The TDMA standard. Boston: Artech House, 1999.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Adrian, Smith, and Jacobs Charles A, eds. IS-136 TDMA technology, economics, and services. Boston: Artech House, 1998.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

L, Jou, Lenart J, and United States. National Aeronautics and Space Administration., eds. Study of optoelectronic switch for SS-TDMA: Final report. Waltham, MA: GTE Laboratories Inc., 1989.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

National Institute of Standards and Technology (U.S.), ed. Recommendation for the Triple Data Encryption Algorithm (TDEA) block cipher. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2004.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Fouad, Abousamra, Baric Ante, Civili Francesco Saverio, United Nations Environment Programme, United Nations Environment Programme. Mediterranean Action Plan., and Global Environment Facility, eds. Transboundary diagnostic analysis, TDA, for the Mediterranean Sea. Athens: UNEP/MAP/MED POL, 2005.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

illustrateur, Morin Jean 1959, ed. Le TDA/H raconté aux enfants: J'ai un quoi? Boucherville, Québec: Éditions de Mortagne, 2016.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Capitoli di libri sul tema "TDOA"

Seong, Nak-Seon, and Seong-Ook Park. "Clock Offsets in TDOA Localization." In Ubiquitous Computing Systems, 111–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11890348_9.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Kistanov, Pavel, Elizaveta Shcherbinina, Alexander Titov, Oleg Tsarik, and Igor Tsikin. "Direct TDOA Based Positioning in Satellite Geolocation." In Springer Proceedings in Physics, 729–38. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58868-7_79.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Gambi, J. M., M. C. Rodriguez-Teijeiro, and M. L. Garcia del Pino. "The Post-Newtonian Geolocation Problem by TDOA." In Mathematics in Industry, 489–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25100-9_56.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Liu, Guangzhe, Jingyu Hua, Feng Li, Weidang Lu, and Zhijiang Xu. "A Quadratic Programming Localization Based on TDOA Measurement." In Lecture Notes in Electrical Engineering, 1243–50. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6504-1_148.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Burgess, Simon, Yubin Kuang, Johannes Wendeberg, Kalle Åström, and Christian Schindelhauer. "Minimal Solvers for Unsynchronized TDOA Sensor Network Calibration." In Algorithms for Sensor Systems, 95–110. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-45346-5_8.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Lee, S. C., W. R. Lee, and K. H. You. "TDoA Based UAV Localization Using Dual-EKF Algorithm." In Communications in Computer and Information Science, 47–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10741-2_6.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Shao, Hongshuo, Dongkyun Kim, and Kwanho You. "TDOA/FDOA Geolocation with Adaptive Extended Kalman Filter." In Communications in Computer and Information Science, 226–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17625-8_23.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Li, Wenquan, and Bing Zhao. "Analysis of TDOA Location Algorithm Based on Ultra-Wideband." In Lecture Notes in Electrical Engineering, 1257–61. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9409-6_149.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Li, Peihua, and Xianzhe Ma. "Robust Acoustic Source Localization with TDOA Based RANSAC Algorithm." In Emerging Intelligent Computing Technology and Applications, 222–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04070-2_25.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Zhao, Weibo, Yue Su, Li Zheng, and Fei Ma. "TDOA-Based Autonomous Positioning Method for Smart IoT Services." In Lecture Notes in Electrical Engineering, 38–46. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2116-0_5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "TDOA"

Richter, Rei, and Yiftach Richter. "Practical Optimization of TDoA Geo-Location." In 2024 IEEE International Conference on Microwaves, Communications, Antennas, Biomedical Engineering and Electronic Systems (COMCAS), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/comcas58210.2024.10666192.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Zou, Yanbin, Yangpeng Xiao, Zekai Zhang, and Huaping Liu. "TDOA Localization via Fixed-Point Iteration." In ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 1–5. IEEE, 2025. https://doi.org/10.1109/icassp49660.2025.10888067.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Wang, Yuhong, Yonghong Zeng, Peng Hui Tan, Sumei Sun, and Yugang Ma. "Drone Controller Localization Based on TDoA." In 2025 IEEE Wireless Communications and Networking Conference (WCNC), 1–6. IEEE, 2025. https://doi.org/10.1109/wcnc61545.2025.10978550.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Lai, Liping, Zhangmin He, Jiongqi Wang, Xuanying Zhou, and Haiyin Zhou. "Precision Boundary Analysis of TOA and TDOA." In 2024 43rd Chinese Control Conference (CCC), 3471–76. IEEE, 2024. http://dx.doi.org/10.23919/ccc63176.2024.10662168.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Cao, Jingmin, QUN Wan, Ying Chen, Feng Du, Yang Liu, and Wei Li. "Misspecified CRB for TDOA-based passive localization." In Sixteenth International Conference on Signal Processing Systems (ICSPS 2024), edited by Robert Minasian and Li Chai, 133. SPIE, 2025. https://doi.org/10.1117/12.3061498.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Zhu, Hongbin. "TDOA Positioning Based on Bayesian Regularization Method." In 2025 5th International Conference on Sensors and Information Technology (ICSI), 531–38. IEEE, 2025. https://doi.org/10.1109/icsi64877.2025.11009693.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Feng, Xuefeng, Zhen Huang, Jiazhi He, and Lei Shi. "A Moving Source Localization Method Based on TDOA and TDOA Rate." In 2021 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC). IEEE, 2021. http://dx.doi.org/10.1109/icspcc52875.2021.9564741.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Panetta, Chandler J., Osama N. Ennasr, and Xiaobo Tan. "Distributed Particle Filter With Online Model Learning for Localization Using Time-Difference-of-Arrival (TDOA) Measurements." In ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3305.

Testo completo

Abstract (sommario):

Abstract The problem of localizing a moving target arises in various forms in wireless sensor networks. Deploying multiple sensing receivers and using the time-difference-of-arrival (TDOA) of the target’s emitted signal is widely considered an effective localization technique. Traditionally, TDOA-based algorithms adopt a centralized approach where all measurements are sent to a predefined reference node for position estimation. More recently, distributed TDOA-based localization algorithms have been shown to improve the robustness of these estimates. For target models governed by highly stochastic processes, the method of nonlinear filtering and state estimation must be carefully considered. In this work, a distributed TDOA-based particle filter algorithm is proposed for localizing a moving target modeled by a discrete-time correlated random walk (DCRW). We present a method for using data collected by the particle filter to estimate the unknown probability distributions of the target’s movement model, and then apply the distribution estimates to recursively update the particle filter’s propagation model. The performance of the distributed approach is evaluated through numerical simulation, and we show the benefit of using a particle filter with online model learning by comparing it with the non-adaptive approach.

Gli stili APA, Harvard, Vancouver, ISO e altri

Wendeberg, Johannes, Fabian Hoflinger, Christian Schindelhauer, and Leonard Reindl. "Anchor-free TDOA self-localization." In 2011 International Conference on Indoor Positioning and Indoor Navigation (IPIN). IEEE, 2011. http://dx.doi.org/10.1109/ipin.2011.6071909.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bandiera, Francesco, Angelo Coluccia, Giuseppe Ricci, Fabio Ricciato, and Danilo Spano. "TDOA Localization in Asynchronous WSNs." In 2014 12th IEEE International Conference on Embedded and Ubiquitous Computing (EUC). IEEE, 2014. http://dx.doi.org/10.1109/euc.2014.35.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Rapporti di organizzazioni sul tema "TDOA"

Fowler, Mark L. Data Compression Trade-Offs for TDOA/FDOA Geo-Location Systems. Fort Belvoir, VA: Defense Technical Information Center, February 2008. http://dx.doi.org/10.21236/ada483204.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hippenstiel, Ralph D., Timothy Haney, and Tri T. Ha. Improvement of the Time Difference of Arrival (TDOA) Estimation of GSM Signals Using Wavelets. Fort Belvoir, VA: Defense Technical Information Center, June 2000. http://dx.doi.org/10.21236/ada380368.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hippenstiel, Ralph D., Tri T. Ha, and Unal Aktas. Localization of Wireless Emitters Based on the Time Difference of Arrival (TDOA) and Wavelet Denoising. Fort Belvoir, VA: Defense Technical Information Center, May 1999. http://dx.doi.org/10.21236/ada363100.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bednar, Amy. Topological data analysis : an overview. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40943.

Testo completo

Abstract (sommario):

A growing area of mathematics topological data analysis (TDA) uses fundamental concepts of topology to analyze complex, high-dimensional data. A topological network represents the data, and the TDA uses the network to analyze the shape of the data and identify features in the network that correspond to patterns in the data. These patterns extract knowledge from the data. TDA provides a framework to advance machine learning’s ability to understand and analyze large, complex data. This paper provides background information about TDA, TDA applications for large data sets, and details related to the investigation and implementation of existing tools and environments.

Gli stili APA, Harvard, Vancouver, ISO e altri

Arumugam, Mahesh, and Sandeep S. Kulkarni. Self-Stabilizing Deterministic TDMA for Sensor Networks. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada455715.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Berry, D. A. [TDA`s hot gas desulfurization sorbent]. TDA Inc./FETC CRADA No. 97-F003, final report. Office of Scientific and Technical Information (OSTI), November 1997. http://dx.doi.org/10.2172/629371.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hoffman, L. G. Technology development, evaluation, and application (TDEA) FY 1997 progress report. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/663508.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Kulkarni, Sandeep S., and Mahesh Arumugam. Infuse: A TDMA Based Data Dissemination Protocol for Sensor Networks. Fort Belvoir, VA: Defense Technical Information Center, November 2004. http://dx.doi.org/10.21236/ada460202.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Barker, W. C., and E. B. Barker. Recommendation for the triple data encryption algorithm (TDEA) block cipher. Gaithersburg, MD: National Institute of Standards and Technology, 2012. http://dx.doi.org/10.6028/nist.sp.800-67r1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Barker, Elaine, and Nicky Mouha. Recommendation for the Triple Data Encryption Algorithm (TDEA) block cipher. Gaithersburg, MD: National Institute of Standards and Technology, November 2017. http://dx.doi.org/10.6028/nist.sp.800-67r2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!