Experimental results of a combined TDOA/TOF technique for UWB based localization systems

Mazraani, Rami; Saéz, Manuel Alcántara; Govoni, Leonardo; Knobloch, Daniel

doi:10.1109/iccw.2017.7962796

Cited by 40 publications

(17 citation statements)

References 9 publications

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“…Fig. 6 also indicates that the proposed hybrid localization algorithm outperforms the combined TOF/TDOA (C-TDOA) method in [36]. On the one hand, the relative clock skew of the tag and anchor in this paper is estimated to compensate for the biased TOF result, while this does not occur in the C-TDOA method.…”

Section: Simulation Resultsmentioning

confidence: 86%

“…For a given noise level, we operate 1000 independent simulations. Second, we compare the proposed algorithm with the pure TDOA (P-TDOA) method in [36], the combined TOF/TDOA (C-TDOA) method in [36] and the method in [27] to test the impact of the clock skew parameter. Then, the energy consumption is also compared for all the above considered methods.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Due to a lack of synchronization, the relative clock offset among the anchors affects the localization accuracy significantly (a 10 ns error in time can lead to a 3 m error in the localization result). In contrast to [36], we propose an improved clock offset estimation method for TDOA-based localization, where the clock skew and the clock drift are both considered.…”

Section: B Tdoa Techniquementioning

confidence: 99%

“…However, it is not easy to find the locations of tags because the range measurements present a nonlinear function with the coordinates of tags. In general, many combined rangingbased localization algorithms seem to improve the localization accuracy compared with the single technique due to the requirements (e.g., clock synchronization and antenna array) [12], [34]- [36]. In [12], a novel hybrid RSS and TOA positioning method is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, many applications require low-power costs and need to work for a long period, especially in mobile environments. To reduce the power consumption, a combined TOF and TDOA localization algorithm is proposed in [36]. However, the clock skew is not considered, which leads to unsatisfactory ranging accuracy.…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid Localization Algorithm Based on TOF and TDOA for Asynchronous Wireless Sensor Networks

et al. 2019

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Accuracy and energy consumption are two crucial assessment standards for localization systems. The positioning algorithm used in a single technique may not balance the accuracy and power problem due to its limitations. Moreover, the performance of the existing combined localization method is unsatisfactory. In this paper, taking the relative clock skew into account, we investigate the biased time-of-flight (TOF) compensation problem in the symmetric double-sided two-way ranging (SDS-TWR) method. We first estimate the relative clock skew among sensor nodes to improve the accuracy of the ranging result. We then combine with the time-difference-of-arrival (TDOA) algorithm and reduce the number of transmissions and receptions on the tag (a node that needs to be located) side. Finally, the tag location is determined by Newton's iteration method. A simulation is implemented to validate our theoretical analysis and the results show that our proposed hybrid localization algorithm improves the locating accuracy significantly, compared with that of the C-TDOA method. Furthermore, the proposed hybrid localization algorithm can overcome the shortcoming of high power cost in the conventional TOF-based algorithm. INDEX TERMS Wireless sensor network, hybrid localization algorithm, time-difference-of-arrival (TDOA), time-of-flight (TOF), clock skew estimation.

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Section: Simulation Resultsmentioning

confidence: 86%