Short Multipath Insensitive Code Loop Discriminator

Jardak, Nabil; Samama, Nel

doi:10.1109/taes.2010.5417162

Cited by 19 publications

(5 citation statements)

References 9 publications

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“…Different from GPS satellite, which uses high‐cost atomic clock to keep the accurate time, the Locatalite employs a low‐cost temperature‐compensated crystal oscillator clock . The main difficulties of this system are how to synchronize all of the base stations accurately and how to mitigate the multipath error, which is dominant in the positioning accuracy . A direct digital synthesis technology is used in the time‐synchronization procedure within the LocataNet, known as TimeLoc .…”

Section: Positioning Sensormentioning

confidence: 99%

Local positioning systems versus structural monitoring: a review

Casciati

2014

Struct. Control Health Monit.

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SUMMARY Structural monitoring and structural health monitoring could take advantage from different devices to record the static or dynamic response of a structure. A positioning system provides displacement information on the location of moving objects, which is assumed to be the basic support to calibrate any structural mechanics model. The global positioning system could provide satisfactory accuracy in absolute displacement measurements. But the requirements of an open area position for the antennas and a roofed room for its data storage and power supply limit its flexibility and its applications. Several efforts are done to extend its field of application. The alternative is local positioning system. Non‐contact sensors can be easily installed on existing infrastructure in different locations without changing their properties: several technological approaches have been exploited: laser‐based, radar‐based, vision‐based, etc. In this paper, a number of existing options, together with their performances, are reviewed. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Positioning Sensormentioning

confidence: 99%

Local positioning systems versus structural monitoring: a review

Casciati

2014

Struct. Control Health Monit.

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“…This paragraph addresses a " short multipath insensitive code loop" (SMICL) mitigation technique, developed in the context of the repeater based positioning system: the goal is to mitigate multipath (Jardak and Samama 2010). For this, a new discriminator function has been proposed which is insensitive to multipath signals having relative delays of less than 146.5 m, equivalent to half a chip length.…”

Section: The Multipath Mitigation Technique Developedmentioning

confidence: 99%

Indoor Positioning with GNSS-Like Local Signal Transmitters

Samama¹

2012

Global Navigation Satellite Systems: Signal, Theory and Applications

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“…Therefore, research on radio positioning methods suitable for indoor environments has become urgently demanded [4][5][6]. Serious multipath effects in indoor environments have consistently been the main error source affecting indoor positioning accuracy, and many scholars are committed to the study of multipath mitigation technologies, the primary methods of which include loop mitigation technologies [7,8], postprocessing technologies [9,10] and airspace mitigation technologies [11,12]. Since indoor multipath signals are rich and contain geometric information, exploiting instead of mitigating multipath propagation has attracted intense research interest, the principle of which is shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

An adaptive algorithm for multipath-assisted simultaneous localization and mapping using belief propagation

Dan¹,

Lian²,

Tang³

2021

Meas. Sci. Technol.

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In multipath-assisted simultaneous localization and mapping (SLAM), position-related information (delays and angles) in multipath components of radio signals is used to simultaneously localize user equipment (UE) and map the environment. Multipath-assisted SLAM often involves unknown parameters that are potentially time varying, such as measurement noise. Knowledge of the measurement noise is of critical importance to multipath-assisted SLAM, and uncertainty in such knowledge will seriously affect estimation accuracy. We address this challenge by improving the belief propagation (BP)-based SLAM algorithm and proposing an adaptive multipath-assisted SLAM algorithm in a Bayesian tracking framework, which enables accommodation of a model mismatch of the measurement noise online. Specifically, we describe the evolution of the measurement noise standard deviation via a Markov chain and integrate it into the factor graph representing the Bayesian model of the multipath-assisted SLAM. Then, the BP message passing algorithm is leveraged to calculate the marginal posterior distributions of the UE, environmental features and the measurement noise standard deviation to achieve SLAM and the adaptive adjustment of the measurement noise. Finally, the experimental results verify the robustness of the proposed adaptive multipath-assisted SLAM algorithm against the uncertainty of the measurement noise.

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Short Multipath Insensitive Code Loop Discriminator

Cited by 19 publications

References 9 publications

Local positioning systems versus structural monitoring: a review

Local positioning systems versus structural monitoring: a review

Indoor Positioning with GNSS-Like Local Signal Transmitters

An adaptive algorithm for multipath-assisted simultaneous localization and mapping using belief propagation

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