On the unimportance of phase-coherent measurements for beampattern-assisted positioning

Kulmer, Josef; Grebien, Stefan; Rath, Michael; Witrisal, Klaus

doi:10.1109/wcnc.2018.8377443

Cited by 3 publications

(11 citation statements)

References 13 publications

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“…Additionally, in Fig. 5d, the PEB is shown for the simplified, canonical EFIM (38). It can be seen that the simplified PEB follows closely the full form, justifying the assumption in (65).…”

Section: B Peb Results For Different Setupssupporting

confidence: 63%

“…We evaluate the PEB described in (37) for each agent position, where we use both the full FIM, whose elements were computed using (49) (the respective sub-matrices are given in (51)-(56)), as well as the simplified, canonical EFIM from (38). We also select representative agent positions to show the respective scaled error ellipses that illustrate the components of the PEB in 2D-space.…”

Section: B Peb Results For Different Setupsmentioning

confidence: 99%

“…The only significant differences are present in selected regions where SMC path overlap occurs. For the top left position, it is shown how the Fisher information from (38) affects both the radial and tangential position error via the information gains from delay and angle information, respectively.…”

Section: B Peb Results For Different Setupsmentioning

confidence: 99%

“…Furthermore, a large degradation is evident with an increased distance from the anchor. This is a well-known drawback of angle measurements, which can be seen mathematically from the inverse distance-scaling of the angle term in (38). Using M = 16 antennas greatly increases the positioning performance, which stands in stark contrast to the delay information improvements.…”

Section: B Peb Results For Different Setupsmentioning

confidence: 99%

“…We significantly extend our initial error bound analysis provided in [32], in particular, a detailed analysis of AoA information has been included yielding guidelines for the design of antenna radiation patterns. Furthermore, we describe a positioning algorithm based on our previous work in [31], [37], [38] and analyze its performance in comparison to the CRLB, using synthetically generated data as well as measured data. Our specific contributions are:…”

Section: B Contributions Of the Papermentioning

confidence: 99%

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Single-Anchor Positioning: Multipath Processing With Non-Coherent Directional Measurements

et al. 2020

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High-accuracy indoor radio positioning can be achieved by using (ultra) wideband (UWB) radio signals. Multiple fixed anchor nodes are needed to compute the position or alternatively, specular multipath components (SMCs) extracted from radio signals can be exploited. In this work, we study a multipath-based, single-anchor positioning system that acquires directional measurements non-coherently. These non-coherent measurements can be obtained, e.g., from a single-chain mm-wave transceiver with analog beam steering or from a low-complexity ultra-wideband transceiver with switched directional antennas. The directional antennas support the separation of SMCs and the suppression of the undesired diffuse multipath component (DMC) with the benefit that the required signal bandwidth can be drastically reduced. The paper analyzes the Cramér-Rao lower bound (CRLB) on the position estimation error to gain insight in the influence of the system design parameters as well as the impact of the DMC on the position error. The CRLB is compared between the non-coherent antenna setup, a conventional array with coherent processing, and a single-antenna setup. A maximum-likelihood position estimation algorithm is formulated. Its performance is evaluated with synthetically generated data as well as with UWB measurements. We show that the accuracy and robustness are significantly improved due to the processing of angular information. Analyzing the measured data for a line-of-sight link, the median error decreases from 22 down to 7 cm, the measurements better than 20 cm increase from 46 to 95 %, and outliers above 50 cm reduce from 12 to 0 %. INDEX TERMS Radio positioning, single-anchor, Fisher information, position error bound, directional antenna, multipath component, non-coherent array processing.

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Section: B Peb Results For Different Setupssupporting

confidence: 63%

Section: B Peb Results For Different Setupsmentioning

confidence: 99%

Section: B Peb Results For Different Setupsmentioning

confidence: 99%

Section: B Peb Results For Different Setupsmentioning

confidence: 99%