Multipath mitigation for a phase-based infrared ranging system applied to indoor positioning

Salido-Monzú, David; Martín-Gorostiza, Ernesto; Galilea, José Luis Lázaro; Domingo-Perez, Francisco

doi:10.1109/ipin.2013.6817870

Cited by 12 publications

(13 citation statements)

References 7 publications

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“…Nevertheless, the quantities r ir will be named as observations hereafter as only a constant factor is needed to convert φ ir into r ir . [41,47] or working with orientable detectors [42]).…”

Section: Methods Descriptionmentioning

confidence: 99%

An Indoor Positioning Approach Based on Fusion of Cameras and Infrared Sensors

Martín-Gorostiza¹,

García-Garrido²,

Pizarro³

et al. 2019

Preprint

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A method for infrared and cameras sensor fusion, applied to indoor positioning in intelligent spaces, is proposed in this work. The fused position is obtained with a maximum likelihood estimator from infrared and camera independent observations. Specific models are proposed for variance propagation from infrared and camera observations (phase shifts and image respectively) to their respective position estimates and to the final fused estimation. Model simulations are compared with real measurements in a setup designed to validate the system. The difference between theoretical prediction and real measurements  is between 0.4 cm (fusion) and  2.5 cm (camera), within a 95% confidence margin. The positioning precision is in the cm level (sub-cm level can be achieved at most tested positions) in a 4x3 m locating cell with 5 infrared detectors on the ceiling and one single camera, at distances from target up to 5 m and 7 m respectively. Due to the low cost system design and the results observed, the system is expected to be feasible and scalable to large real spaces.

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Section: Methods Descriptionmentioning

confidence: 99%

An Indoor Positioning Approach Based on Fusion of Cameras and Infrared Sensors

Martín-Gorostiza¹,

García-Garrido²,

Pizarro³

et al. 2019

Preprint

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“…But this ranging instrument is less demanding on distance. Besides laser has a certain influence on people's health [2]. The distance of infrared ranging is medium and the production cost is low and simple.…”

Section: The Basic Principle Of Infrared Distance Measurementmentioning

confidence: 99%

Development and Application of Sensitivity Adjustable Intelligently Infrared Ranging Instrument

Wei¹,

Liu²,

Wei³

et al. 2017

dtcse

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Abstract. Infrared distance measurement has been widely used in the actual industrial production. In order to improve the automation of the ranging mode and sensitivity of intelligent control, this paper combines the infrared sensor technology and electronic application technology to develop a set of sensitivity adjustable intelligently infrared ranging instrument. This infrared range instrument can not only realize the measurement of the distance between objects, but also realizes the intelligent adjustment of sensitivity. Thus, the application scope of infrared ranging instrument is further widened in industrial production.

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“…The general structure and functioning of the proposal that contextualizes this work was presented in [ 20 ]. Figure 1 shows the structure of the full ranging system.…”

Section: Contextmentioning

confidence: 99%

Delay Tracking of Spread-Spectrum Signals for Indoor Optical Ranging

Salido-Monzú

Martín-Gorostiza

Galilea

et al. 2014

Sensors

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Delay tracking of spread-spectrum signals is widely used for ranging in radio frequency based navigation. Its use in non-coherent optical ranging, however, has not been extensively studied since optical channels are less subject to narrowband interference situations where these techniques become more useful. In this work, an early-late delay-locked loop adapted to indoor optical ranging is presented and analyzed. The specific constraints of free-space infrared channels in this context substantially differ from those typically considered in radio frequency applications. The tracking stage is part of an infrared differential range measuring system with application to mobile target indoor localization. Spread-spectrum signals are used in this context to provide accurate ranging while reducing the effect of multipath interferences. The performance of the stage regarding noise and dynamic errors is analyzed and validated, providing expressions that allow an adequate selection of the design parameters depending on the expected input signal characteristics. The behavior of the stage in a general multipath scenario is also addressed to estimate the multipath error bounds. The results, evaluated under realistic conditions corresponding to an 870 nm link with 25 MHz chip-rate, built with low-cost up-to-date devices, show that an overall error below 6% of a chip time can be achieved.

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Multipath mitigation for a phase-based infrared ranging system applied to indoor positioning

Cited by 12 publications

References 7 publications

An Indoor Positioning Approach Based on Fusion of Cameras and Infrared Sensors

An Indoor Positioning Approach Based on Fusion of Cameras and Infrared Sensors

Development and Application of Sensitivity Adjustable Intelligently Infrared Ranging Instrument

Delay Tracking of Spread-Spectrum Signals for Indoor Optical Ranging

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