Elliptical modification of trilateration method based on linear model of distance vs power ratio for RFID tags spatial localization
Journal Title: Вісник НТУУ КПІ. Серія Радіотехніка, Радіоапаратобудування - Year 2013, Vol 0, Issue 55
Abstract
Introduction. Radio-frequency identification (RFID) systems can be applied for a 2D spatial localization of objects in indoor spaces. For implementing the known localization method of trilateration one needs to build a model of ratio of distance between antenna and RFID tag versus power level of tag response signal. To maximize the accuracy of the model, one needs to collect measurement data from RFID tags placed at known positions. Due to the labor intensity of this process we aim to develop an alternative modification of elliptical trilateration method resulting in elimination of the preliminary data collecting stage. Theory part. We propose to use a linear model of distance vs power ratio for localization of passive RFID tags with small read ranges. Additionally, our model takes into account the possible ellipticity of position figures which happens because of antennas directivity. Also we propose some heuristics for solving the estimates ambiguity problem which arises when response signals from RFID tags are received by one or two antennas. Experimental part. We carried out the experimental analysis of the proposed trilateration variant using the previously developed RFID system in the 5 m ´ 5 m localization field. During the experiment, we compared our variant with a classical trilateration which was based on the polynomial model of distance vs power ratio formed by analyzing preliminarily gathered measurement data from RFID tags. The comparison indicated that our variant had a bigger by 1.6 cm mean localization error. Furthermore, taking into account ellipticity of position figures resulted in decrease of localization error for 18 of the 24 analyzed cases. Conclusions. It was determined that the proposed trilateration modification produced a slightly bigger mean localization error compared to the classical variant of trilateration. However, our approach allows one to eliminate the preliminary labor-intensive stage of collecting measurement data from RFID tags.
Authors and Affiliations
Yu. Gimpilevich, D. Savochkin
Keywords
Related Articles
- EP ID EP309078
- DOI 10.20535/RADAP.2013.55.80-88
- Views 69
- Downloads 0
Two-part electrodes of the physical phantom for EIT
In this article explored methods for increasing of the accuracy of measurement in the hardware part of the electrical impedance tomograph, in particular, in its electrode system, which contains two-parts (combined) elect...
Parameters of the emitters of a cold plasma
Investigatedin the microwave range radiophysical characteristics of cold plasma gas discharge andelectromagnetic characteristics of the U-shaped loop and a straight rod plasma emitters (PE)performed on the basis of the p...
Low noise frequency synthesizer of a centimeter range wave
A highly stable, low noise 10.7 GHz frequency synthesizer for radio-relay link transceiver is presented. The basic elements of synthesizer are electrically tuned 5.35 GHz dielectric ring oscillator and transistor frequen...
The entropy analysis of radio control process
Introduction. Macroscopic analysis makes it possible to consider the radio control process as a whole and go from casual to regular for studies of complex systems and processes. The transition to a qualitatively new leve...
Analysis of spectral and correlation characteristics of sounding signal with the triangular frequency intra-modulation
A signal with a symmetric linear frequency modulation and its properties are considered, analytic form of signal and its spectrum are shown, figures of amplitude and phase spectra of signal are drawn, figures of ambigui...