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Träfflista för sökning "WFRF:(Tufvesson Fredrik) ;pers:(Mannesson Anders)"

Sökning: WFRF:(Tufvesson Fredrik) > Mannesson Anders

  • Resultat 1-6 av 6
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1.
  • Mannesson, Anders, et al. (författare)
  • Optimal Virtual Array Length Under Position Imperfections
  • 2014
  • Ingår i: [Host publication title missing]. - 2151-870X .- 1551-2282. ; , s. 5-8
  • Konferensbidrag (refereegranskat)abstract
    • This article contains a study of how spatial errors and receiver imperfections affect the angle of arrival estimation accuracy for virtual antenna arrays. A virtual antenna array consists of one receiver element whose location is tracked as the element is moved and in this work, linear arrays are studied. If the location of the receiver is tracked using an inertial measurement unit, an interesting trade-off emerges. The array should extend as far as possible but since the position estimates from the unaided inertial measurement unit become increasingly uncertain over time, the angle of arrival estimation will deteriorate. Several algorithms are available for estimating the angle of arrival in such a scenario but the one used for evaluation here is a sparse enforcing least squares method.
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2.
  • Mannesson, Anders, et al. (författare)
  • Radio and IMU based indoor positioning and tracking
  • 2012
  • Ingår i: 2012 19th International Conference on Systems, Signals and Image Processing (IWSSIP). - 9781457721915 ; , s. 32-35
  • Konferensbidrag (refereegranskat)abstract
    • Navigation using inertial measurement units (IMUs) is an interesting area of research. Due to the low cost hardware and simple implementation, the approach looks very attractive. But the performance of the IMUs to provide sub-meter accuracy over a longer period of time is still not sufficient, so different approaches have been adopted to increase the performance at the cost of extra hardware and/or infrastructure. Our solution is based on the use of already existing radio infrastructure, where amplitude and phase variations in a received radio signal at the user terminal is used together with the IMU to do a tightly coupled estimation of navigation and radio signalmultipath components. The results show that the approach has the potential to enhance the performance of IMU based navigation significantly.
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3.
  • Mannesson, Anders, et al. (författare)
  • Tightly Coupled Positioning and Multipath Radio Channel Tracking
  • 2016
  • Ingår i: IEEE Transactions on Aerospace and Electronic Systems. - 0018-9251. ; , s. 1522-1535
  • Tidskriftsartikel (refereegranskat)abstract
    • Radio based localization is an active research topic with a wide range of applications. In this paper, we focus on localization of a radio receiver equipped with an inertial measurement unit. The localization is performed while simultaneously constructing a map of the small scale fading pattern in the local radio environment. The map in our case is a ray-trace-based multipath channel model. This solution is enabled by sensor fusion of information from the channel estimation data and the inertial sensors, and it does not assume any knowledge of, e.g., transmitter locations. The sensor data is fused in a recursive state space model that combines the kinematic motion model with the ray-based radio channel model, and the state vector is estimated using a particle filter. The choice of the particle filter is justified by the multimodal characteristics of the posterior likelihood distributions that follows from the nonlinearities of the problem. The work is assuming a single receiver antenna but the approach can also be transferred to multiple antenna systems. We study the performance of the approach under realistic assumptions, based on the performance of today’s low-cost inertial sensors and radio systems, including accelerometer and gyroscope noise, and also radio receiver frequency error and noise. Simulations show a significant improvement in long-term positioning performance, evaluated against dead reckoning. The work is concluded with experiments which serve as a proof of concept for the proposed technique, using no extra equipment compared to what can be found in a modern cellular phone.
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4.
  • Yaqoob, Muhammad Atif, et al. (författare)
  • Direction of Arrival Estimation with Arbitrary Virtual Antenna Arrays using Low Cost Inertial Measurement Units
  • 2013
  • Ingår i: [Host publication title missing]. ; , s. 79-83
  • Konferensbidrag (refereegranskat)abstract
    • In this paper, we have investigated the use of virtual antenna arrays at the receiver to do single antenna direction-of-arrival estimation. The array coordinates are obtained by doing simple dead reckoning using acceleration and angular speed measurements from a low cost micro-electro-mechanical system inertial measurement unit (IMU). The proposed solution requires no extra hardware in terms of receiver chains and antenna elements. Direction-of-arrival estimation results are obtained using a high resolution SAGE algorithm. Measurement results show that the direction-of-arrival can be estimated with a reasonable accuracy in an indoor environment.
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5.
  • Yaqoob, Muhammad Atif, et al. (författare)
  • On the Performance of Random Antenna Arrays for Direction of Arrival Estimation
  • 2014
  • Ingår i: [Host publication title missing]. - 2164-7038. ; , s. 193-199
  • Konferensbidrag (refereegranskat)abstract
    • A single antenna based virtual antenna array at the receiver can be used to find direction of different incoming radio signals impinging at the receiver. In this paper, we investigate the performance of random 3D virtual antenna arrays for DoA estimation. We have computed a Cramer-Rao Lower Bound (CRLB) for DoA estimation if the true antenna positions are not known, but these are estimated with an uncertainty. Position displacement is estimated with an extended Kalman filter (EKF) by using simulated data samples of acceleration and rotation rate which are corrupted by stochastic errors, such as, white Gaussian noise and bias drift. Furthermore, the effect of position estimation error on the DoA estimation performance is evaluated using the CRLB. The results show that the number of useful elements in the antenna array is limited, because the standard deviation of the position estimation error grows over time.
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6.
  • Yaqoob, Muhammad Atif, et al. (författare)
  • Source Localization Using Virtual Antenna Arrays
  • 2015
  • Ingår i: 2015 International Conference on Localization and GNSS (ICL-GNSS). - 9781479998586
  • Konferensbidrag (refereegranskat)abstract
    • Using antenna arrays for direction of arrival (DoA) estimation and source localization is a well-researched topic. In this paper, we analyze virtual antenna arrays for DoA estimation where the antenna array geometry is acquired using data from a low-cost inertial measurement unit (IMU). Performance evaluation of an unaided inertial navigation system with respect to individual IMU sensor noise parameters is provided using a state space based extended Kalman filter. Secondly, using Monte Carlo simulations, DoA estimation performance of random 3-D antenna arrays is evaluated by computing Cramér-Rao lower bound values for a single plane wave source located in the far field of the array. Results in the paper suggest that larger antenna arrays can provide significant gain in DoA estimation accuracy, but, noise in the rate gyroscope measurements proves to be a limiting factor when making virtual antenna arrays for DoA estimation and source localization using single antenna devices.
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  • Resultat 1-6 av 6
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