Global ETD Search
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Showing 1 to 20 of 26 for “"TDOA"”.
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Lokalizace akustických zdrojů metodou TDOA
… praktickým řešením akustické lokalizace metodou TDOA. Rozvádí návrh schémat pro vysílač a přijímač. Dále uvádí způsob komunikace mezi procesorem, který vyhodnocuje přijatý signál, a počítačem, jež výsledek zobrazuje ve srozumitelné podobě. A nakonec se zabývá návrhem plošných spojů.
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Evaluation of TDOA Techniques for Position Location in CDMA Systems
… E-911 service. The Time Difference of Arrival (TDOA) technique is one of the most promising position location techniques for cellular-type wireless communication systems. The IS-95 Code Division Multiple Access (CDMA) system is a popular choice for the companies deploying new cellular and PCS …
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Data Fusion For Improved TOA/TDOA Position Determination in Wireless Systems
… (TOA) and the Time-Difference-of-Arrival (TDOA) methods are the technology that can provide accurate PL information without necessitating excessive hardware or software changes to the existing cellular/PCS infrastructure. The TOA method works well when the mobile station (MS) is located …
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Design and Implementation of a Distributed Tdoa-Based Geolocation System Using Ossie and Low-Cost Usrp Boards
… of emitters using time difference of arrival (TDOA) computations. Several OSSIE components and tools are developed to support this research. Results are presented showing the capabilities of the geolocation system.
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Impact of MIMO Transmission on CAF-Based Geolocation
… emitter based on the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) of the received signals. CAF performance has been thoroughly investigated in regards to traditional single-input single-output (SISO) signals. Little is known about how the CAF will respond to signals …
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Nonlinear filtering for narrow-band time delay estimation
… estimates of the time difference of arrival (TDoA) between pairs of spatially separated sensors - this work improves those estimates by independently tracking each TDoA using a Bayesian filter. This tracking is particularly useful for overcoming spatial aliasing, which results from tracking …
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Source localization via time difference of arrival
… sources, time difference of arrival (TDOA) of the signals received at pairs of sensors is typically employed. A two-stage localization method in multipath environments is proposed. During the first stage, TDOA of the signals received at pairs of sensors is estimated. In the second …
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Indoor Positioning Using Acoustic Pseudo-Noise Based Time Difference of Arrival
… (PN) based time difference of arrival (TDoA). The system’s infrastructure consists of synchronized speakers. The object to be located, or receiver, extracts TDoA information and uses multilateration to calculate its position. The proposed IPS utilizes sound waves since they travel much …
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Locating Unknown Interference Sources with Time Difference of Arrival Estimates
… to estimate the time difference of arrival (TDoA) between each pair. Then, we used a TDoA localization algorithm to locate each unknown transmitted signal source. In particular, for POWDER, we applied these methods to estimate the source locations of multiple unknown interference signals …
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Wide Area Analysis and Application in Power System
… discussed based on the time delay of arriving (TDOA) in the second part of this work. In this section, author shows the multiply method to calculate event time, which is important when deal with pre-disturbance frequency in TDOA part. Two event kinds are classified by the change of frequency and …
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Spatial Audio for Bat Biosonar
… arrays, using time difference of arrival (TDOA) between array elements or the microphones to locate flying bats (azimuth and elevation). This has provided insight into transmission adaptations with respect to target distance, clutter, and interference. Microphones recording transmitted …
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Microsecond Time Synchronization for Computing Fiber Networks
… can be correlated across devices to extract TDoA measurements for localizing sound sources. Cross-correlation techniques allow us to estimate direction and position, with localization errors reduced from 4.17 m to 0.39 m through clock synchronization. This prototype provides a roadmap for …
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An efficient and computationally attractive localization algorithm under large equal radius scenario
… friendly and efficient estimator based on TDOA measurements under LER scenario. The performance of the proposed estimator is analyzed, and it's shown theoretically that the position covariance matrices can approach the Cramer-Rao Lower Bound (CRLB) when the LER conditions are sufficiently …
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Distributed Localization for Wireless Distributed Networks in Indoor Environments
… of time of or time delay of arrival (TOA/TDOA) or even angle of arrival (AOA), fingerprinting associates unique characteristics such as received signal strength (RSS) that differentiates a location from another location. The location-dependent characteristics then can be used to infer a …
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Efficient localization methods for a point source and rigid body
… of arrival (TOA) and time difference of arrival (TDOA). In such study, the object is far away or only the position information is needed, and we refer this as point source localization. For some applications, e.g., robotics, spacecraft, and gaming, orientation information in addition to position …
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Microphone Array Based Sound Source Detection and Localization with Beamforming, GCC-PHAT, and Triangulation using Arduino and MATLAB
… of arrival (DOA) and time difference of arrival (TDOA) methods at microphone sound sensors. The signals are then analyzed by cross-correlation functions and spatial gradient approach or time-delay based methods are applied, which will be described in our methodology. A tap-based sound source is …
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Underwater Acoustic Localisation in the context of Autonomous Submersibles
… relies on multiple time differences of arrival (TDOA) and a reverse hyperbolic localisation scheme to measure range without any explicit knowledge of the sending times of the acoustic signals. The localisation system performance with regard to accuracy, precision and robustness against …
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Underwater Acoustic Localisation in the context of Autonomous Submersibles
… relies on multiple time differences of arrival (TDOA) and a reverse hyperbolic localisation scheme to measure range without any explicit knowledge of the sending times of the acoustic signals. The localisation system performance with regard to accuracy, precision and robustness against …
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Detection and Position Location of Partial Discharges in Transformers Using Fiber Optic Sensors
… algorithm and time difference of arrival (TDOA). Finally we demonstrated that 100% of the positioning data is bounded by a 22.7Ã 4.1Ã 5.3 mm₃ cube, with a sensing range of 810 mm using the leading edge method with FIR filtering.
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Partial Discharge Detection and Localization in High Voltage Transformers Using an Optical Acoustic Sensor
… system using the time difference of arrival (TDOA) of the acoustic pulse with respect to four sensors that is capable of reporting the three-dimensional position of a PD to within ±5cm on any axis.
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