Recent Advances in Wide Area Real-Time Precise Positioning

Abstract The wide area precise positioning system (WAPPS) is a high-precision positioning system based on a global navigation satellite system. Using a GEO satellite or a communication network, it provides users, in its service area, with real-time satellite orbit, clock, and other corrections. Users can achieve centimeter-level static positioning or decimeter-level kinematic positioning by precise point positioning. With the demands for applications of both high-precision and safety of life in real time, WAPPS is facing urgent needs to improve its service integrity. This study presents a real-time integrity monitoring approach for WAPPS. Using dual-frequency ionosphere-free corrections of GPS and BDS, along with monitor station data, related error models are established and the integrity monitoring is achieved, based on the analysis of satellite corrected residuals. In addition, satellite faults are simulated for performance verification. The results show that the algorithm can monitor both step and drift faults effectively and alert users in time.

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Ionospheric tomographic common clock model of undifferenced uncombined GNSS measurements

Journal of Geodesy ◽

10.1007/s00190-021-01568-8 ◽

2021 ◽

Vol 95 (11) ◽

Author(s):

Germán Olivares-Pulido ◽

Manuel Hernández-Pajares ◽

Haixia Lyu ◽

Shengfeng Gu ◽

Alberto García-Rigo ◽

...

Keyword(s):

Real Time ◽

Carrier Phase ◽

Wide Area ◽

Clock Model ◽

Precise Positioning ◽

Phase Measurements ◽

Central Processing ◽

Processing Facility ◽

Gnss Network ◽

Gnss Measurements

AbstractIn this manuscript, we introduce the Ionospheric Tomographic Common Clock (ITCC) model of undifferenced uncombined GNSS measurements. It is intended for improving the Wide Area precise positioning in a consistent and simple way in the multi-GNSS context, and without the need of external precise real-time products. This is the case, in particular, of the satellite clocks, which are estimated at the Wide Area GNSS network Central Processing Facility (CPF) referred to the reference receiver one; and the precise realtime ionospheric corrections, simultaneously computed under a voxel-based tomographic model with satellite clocks and other geodetic unknowns, from the uncombined and undifferenced pseudoranges and carrier phase measurements at the CPF from the Wide Area GNSS network area. The model, without fixing the carrier phase ambiguities for the time being (just constraining them by the simultaneous solution of both ionospheric and geometric components of the uncombined GNSS model), has been successfully applied and assessed against previous precise positioning techniques. This has been done by emulating real-time conditions for Wide Area GPS users during 2018 in Poland.

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Real-time transient instability detection using frequency trend vector in wide area monitoring system

2016 IEEE 6th International Conference on Power Systems (ICPS) ◽

10.1109/icpes.2016.7584162 ◽

2016 ◽

Cited By ~ 2

Author(s):

G V N YatendraBabu ◽

Nagasekhara Reddy Naguru ◽

Vaskar Sarkar

Keyword(s):

Real Time ◽

Monitoring System ◽

Wide Area ◽

Wide Area Monitoring ◽

Transient Instability ◽

Area Monitoring

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Joy in the Workplace: A Scoping Review of Positive Emotion and Electroencephalogram

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/1071181320641357 ◽

2020 ◽

Vol 64 (1) ◽

pp. 1493-1497

Author(s):

Yaqoub Yusuf ◽

Jodi Boutte’ ◽

Asante’ Lloyd ◽

Emma Fortune ◽

Renaldo C. Blocker

Keyword(s):

Real Time ◽

Scoping Review ◽

Positive Emotion ◽

Positive Emotions ◽

Wearable Sensors ◽

Recent Advances ◽

Electrode Systems ◽

Electroencephalogram Eeg ◽

Occupational Settings

A workplace that is a conduit for positive emotions can be important to employees retention and can contribute optimal levels of productivity. Validated tools for examining emotions are primarily subjective and retrospective in nature. Recent advances in technology have led to more novel and passive ways of measuring emotions. Wearable sensors, such as electroencephalogram (EEG), are being explored to assess cognitive and physical burdens objectively and in real-time. Therefore, there exists a need to investigate and validate the use of EEG to examine emotions objectively and in real-time. In this paper, we conducted a scoping review of EEG to measure positive emotions and/or indicators of joy in the workplace. Our review results in 22 articles that employ EEG to study joy in occupational settings. Three major themes identified in the analysis include (1) EEG for symptoms detection and outcomes, (2) Populations studied using EEG, and (3) EEG electrode systems.

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