Sensor Position Estimation Method for IoT Using Mobile Reference Node

Wideband multiple-input-multiple-output (MIMO) imaging radar can achieve high-resolution imaging with a specific multi-antenna structure. However, its imaging performance is severely affected by the array errors, including the inter-channel errors and the position errors of all the transmitting and receiving elements (TEs/REs). Conventional calibration methods are suitable for the narrow-band signal model, and cannot separate the element position errors from the array errors. This paper proposes a method for estimating and compensating the array errors of wideband MIMO imaging radar based on multiple prominent targets. Firstly, a high-precision target position estimation method is proposed to acquire the prominent targets’ positions without other equipment. Secondly, the inter-channel amplitude and delay errors are estimated by solving an equation-constrained least square problem. After this, the element position errors are estimated with the genetic algorithm to eliminate the spatial-variant error phase. Finally, the feasibility and correctness of this method are validated with both simulated and experimental datasets.

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Initial Position Estimation Method based on Inductance Spatial Harmonic Components for Triple Three-Phase Surface-mounted Permanent Magnet Synchronous Motor

IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society ◽

10.1109/iecon43393.2020.9254746 ◽

2020 ◽

Author(s):

Koji Imai ◽

Giorgio Valente ◽

David Gerada

Keyword(s):

Permanent Magnet ◽

Permanent Magnet Synchronous Motor ◽

Estimation Method ◽

Synchronous Motor ◽

Initial Position ◽

Position Estimation ◽

Spatial Harmonic ◽

Three Phase ◽

Phase Surface ◽

Harmonic Components

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Voltage Injection Based Initial Rotor Position Estimation Method for Three-Phase Star-Connected Switched Reluctance Machines

2007 7th International Conference on Power Electronics and Drive Systems ◽

10.1109/peds.2007.4487746 ◽

2007 ◽

Cited By ~ 1

Author(s):

P. Somsiri ◽

P. Champa ◽

P. Wipasuramonton ◽

K. Tungpimonrut ◽

P. Aree

Keyword(s):

Estimation Method ◽

Position Estimation ◽

Switched Reluctance ◽

Rotor Position ◽

Switched Reluctance Machines ◽

Three Phase ◽

Rotor Position Estimation

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Sinusoidal Control of a Brushless DC Motor with Misalignment of Hall Sensors

Energies ◽

10.3390/en14133845 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3845

Author(s):

Krzysztof Kolano ◽

Bartosz Drzymała ◽

Jakub Gęca

Keyword(s):

Control Method ◽

Acoustic Noise ◽

Negative Impact ◽

Estimation Method ◽

Large Error ◽

Position Estimation ◽

Actual System ◽

Brushless Dc ◽

Hall Sensors ◽

Torque Ripples

This article presents an estimation method of the BLDC rotor position with asymmetrically arranged Hall sensors. Position estimation is necessary to control the motor by methods other than block commutation. A sinusoidal control method was selected for the research, which significantly reduces torque ripples and acoustic noise and is quite simple to implement. Inaccurate performance of the elements determining the position of the BLDC motor rotor causes a large error in the position estimation and has a negative impact on the operation of the drive controlled in this way. Using the developed control algorithms, it is possible to correctly determine the mechanical position of the rotor even for multi-pole motors. The proposed method is relatively easy to implement and does not require modification of control systems, being limited to changes only in the software of such devices. The tests of the actual system clearly show the usefulness of such a control method and its effectiveness.

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Joint clock synchronization and position estimation in time of arrival–based passive positioning systems

International Journal of Distributed Sensor Networks ◽

10.1177/1550147718786893 ◽

2018 ◽

Vol 14 (11) ◽

pp. 155014771878689 ◽

Cited By ~ 1

Author(s):

Shenghong Li ◽

Lingyun Lu ◽

Mark Hedley ◽

David Humphrey ◽

Iain B Collings

Keyword(s):

Clock Synchronization ◽

Likelihood Estimation ◽

Least Square Method ◽

Position Estimation ◽

Least Square ◽

Time Of Arrival ◽

Positioning Systems ◽

Reference Node ◽

Localization Scheme ◽

Wireless Signal

A widely used scheme for target localization is to measure the time of arrival of a wireless signal emitted by a tag, which requires the clocks of the anchors (receivers at known locations) to be accurately synchronized. Conventional systems rely on transmissions from a timing reference node at a known location for clock synchronization and therefore are susceptible to reference node failure. In this article, we propose a novel localization scheme which jointly estimates anchor clock offsets and target positions. The system does not require timing reference nodes and is completely passive (non-intrusive). The positioning algorithm is formulated as a maximum likelihood estimation problem, which is solved efficiently using an iterative linear least square method. The Cramér–Rao lower bound of positioning error is also analyzed. It is shown that the performance of the proposed scheme improves with the number of targets in the system and approaches that of a system with perfectly synchronized anchors.

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