Pages
- 1
- 2
- document
-
Tiberius, C.C.J.M. (author), Janssen, G.J.M. (author), Koelemeij, Jeroen (author), Dierikx, Erik (author), Diouf, C.E.V. (author), Dun, H. (author)This paper presents a terrestrial networked positioning system that obtains a reliable time reference from a national time scale realization and distributes it in a prototype to six roadside base stations through a fiber-optic Gigabit Ethernet network. Wireless wideband signals are transmitted by the base stations, thereby enabling...journal article 2023
- document
-
Kazaz, T. (author), Janssen, G.J.M. (author), Romme, J.P.A. (author), van der Veen, A.J. (author)In wireless networks, an essential step for precise range-based localization is the high-resolution estimation of multipath channel delays. The resolution of traditional delay estimation algorithms is inversely proportional to the bandwidth of the training signals used for channel probing. Considering that typical training signals have...journal article 2022
- document
- Diouf, C.E.V. (author), Dun, H. (author), Janssen, G.J.M. (author), Dierikx, Erik (author), Koelemeij, Jeroen (author), Tiberius, C.C.J.M. (author) journal article 2022
- document
-
Koelemeij, Jeroen C.J. (author), Dun, H. (author), Diouf, C.E.V. (author), Dierikx, Erik F. (author), Janssen, G.J.M. (author), Tiberius, C.C.J.M. (author)Global navigation satellite systems (GNSS) are widely used for navigation and time distribution<sup>1–3</sup>, features that are indispensable for critical infrastructure such as mobile communication networks, as well as emerging technologies such as automated driving and sustainable energy grids<sup>3,4</sup>. Although GNSS can provide...journal article 2022
- document
-
Kazaz, T. (author), Romme, J.P.A. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)The presence of rich scattering in indoor and urban radio propagation scenarios may cause a high arrival density of multipath components (MPCs). Often the MPCs arrive in clusters at the receiver, where MPCs within one cluster have similar angles and delays. The MPCs arriving within a single cluster are typically unresolvable in the delay domain....conference paper 2021
- document
-
Diouf, C.E.V. (author), Janssen, G.J.M. (author), Dun, H. (author), Kazaz, T. (author), Tiberius, C.C.J.M. (author)For validation and demonstration of high accuracy ranging and positioning algorithms and systems, a wideband radio signal generation and acquisition testbed, tightly synchronized in time and frequency, is needed. The development of such a testbed requires solutions to several challenges. Tight time and frequency synchronization, derived from...journal article 2021
- document
-
Dun, H. (author), Tiberius, C.C.J.M. (author), Diouf, C.E.V. (author), Janssen, G.J.M. (author)This paper presents a methodology to design a sparse multiband ranging signal with a large virtual bandwidth, from which time delay and carrier phase are estimated by a low complexity multivariate maximum likelihood (ML) method. In the estimation model for a multipath channel, not all reflected paths are considered, and time delay and carrier...journal article 2021
- document
-
Dun, H. (author), Tiberius, C.C.J.M. (author), Diouf, C.E.V. (author), Janssen, G.J.M. (author)Terrestrial positioning systems are being investigated as the complement to the global navigation satellite systems (GNSS), to provide precise and reliable positioning services in a GNSS-challenged environment. In this paper, we present the positioning performance of a ground-based positioning system, in which a multiband OFDM burst is used...conference paper 2021
- document
-
Kazaz, T. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)The multipath radio channel is considered to have a non-bandlimited channel impulse response. Therefore, it is challenging to achieve high resolution time-delay (TD) estimation of multipath components (MPCs) from bandlimited observations of communication signals. It this paper, we consider the problem of multiband channel sampling and TD...conference paper 2020
- document
-
Dun, H. (author), Tiberius, C.C.J.M. (author), Janssen, G.J.M. (author)In developing a high accuracy terrestrial radio navigation system, as a complement to a global navigation satellite system (GNSS), it is recognized that the performance of time delay estimation is proportional to, and thereby limited by, the signal bandwidth. Given a possibly narrow signal bandwidth, the central carrier phase can,...journal article 2020
- document
-
Kazaz, T. (author), Coutino, Mario (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)In this paper, we focus on the problem of blind joint calibration of multiband transceivers and time-delay (TD) estimation of multipath channels. We show that this problem can be formulated as a particular case of covariance matching. Although this problem is severely ill-posed, prior information about radio-frequency chain distortions and...conference paper 2020
- document
-
Dun, H. (author), Tiberius, C.C.J.M. (author), Diouf, C.E.V. (author), Janssen, G.J.M. (author)Time-based ranging accuracy is inversely proportional to the signal bandwidth. A larger the signal bandwidth leads to a higher accuracy of time delay estimation, but more complex hardware is needed. Alternatively, we explore the idea of using multiple narrow signal bands (e.g., 10 MHz of each) to create a large virtual signal bandwidth, which...conference paper 2020
- document
-
Diouf, C.E.V. (author), Dun, H. (author), Kazaz, T. (author), Janssen, G.J.M. (author), Tiberius, C.C.J.M. (author)Global Navigation Satellite Systems (GNSS) are nowadays the most common solutions used to cope with Positioning-Navigation Timing (PNT) applications demands. GNSS are relied on in very diverse contexts and domains, yet the interest in systems such as GPS, GALILEO and Beidou is continuously increasing. However, and in particular for safety...conference paper 2020
- document
-
Dun, H. (author), Tiberius, C.C.J.M. (author), Janssen, G.J.M. (author), Diouf, C.E.V. (author)The matched filter is the most common approach for time delay estimation and ranging in positioning systems. The accuracy is mainly determined by the signal bandwidth and multipath propagation condition. Instead of occupying an enormous signal bandwidth, aggregating multiple signal bands, which are transmitted either simultaneously or...conference paper 2019
- document
-
Kazaz, T. (author), Coutino, Mario (author), Janssen, G.J.M. (author), Leus, G.J.T. (author), van der Veen, A.J. (author)Synchronization and ranging in internet of things (IoT) networks are challenging due to the narrowband nature of signals used for communication between IoT nodes. Recently, several estimators for range estimation using phase difference of arrival (PDoA) measurements of narrowband signals have been proposed. However, these estimators are based...conference paper 2019
- document
-
Kazaz, T. (author), Rajan, R.T. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)Achieving high resolution time-of-arrival (TOA) estimation in multipath propagation scenarios from bandlimited observations of communication signals is challenging because the multipath channel impulse response (CIR) is not bandlimited. Modeling the CIR as a sparse sequence of Diracs, TOA estimation becomes a problem of parametric spectral...conference paper 2019
- document
-
Dun, H. (author), Tiberius, C.C.J.M. (author), Janssen, G.J.M. (author)High accuracy terrestrial radio positioning systems, as a complement to a global navigation satellite system (GNSS), are attracting significant attention from academia and industry. This article investigates the feasibility of positioning based on carrier phase measurements of orthogonal frequency division multiplexing (OFDM) signals. Generally,...conference paper 2018
- document
-
Xie, Y. (author), Janssen, G.J.M. (author), Shakeri, S.M. (author), Tiberius, C.C.J.M. (author)In this paper, a novel statistical approach is presented for time-of-arrival (TOA) estimation based on first path (FP) pulse detection using a sub-Nyquist sampling ultra-wide band (UWB) receiver. The TOA measurement accuracy, which cannot be improved by averaging of the received signal, can be enhanced by the statistical processing of a...journal article 2017
- document
-
Stodolny, Maciej K. (author), Anker, John (author), Geerligs, Bart L.J. (author), Janssen, G.J.M. (author), Van De Loo, Bas W.H. (author), Melskens, J. (author), Santbergen, R. (author), Isabella, O. (author), Schmitz, Jurriaan (author), Lenes, Martijn (author), Luchies, Jan Marc (author), Kessels, Wilhelmus M.M. (author), Romijn, I.G. (author)We present a detailed material study of n<sup>+</sup>-type polysilicon (polySi) and its application as a carrier selective rear contact in a bifacial n-type solar cell comprising fire-through screen-printed metallization and 6" Cz wafers. The cells were manufactured with low-cost industrial process steps yielding V<sub>oc</sub>s from 676 to...journal article 2017
- document
-
Xie, Y. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)A clock synchronization scheme is crucial for obtaining accuracy in time-based positioning systems. Existing clock synchronization schemes are mostly based on a simplified linear clock model, which unfortunately have a poor long-term synchronization accuracy. Assuming a two-way time transfer protocol, we propose a novel clock synchronization...conference paper 2016
Pages
- 1
- 2