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GNSS augmentation

About: GNSS augmentation is a research topic. Over the lifetime, 2478 publications have been published within this topic receiving 28513 citations. The topic is also known as: SBAS & Satellite Based Augmentation System.


Papers
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Patent
01 Dec 2016
TL;DR: In this article, an inertial measurement unit (IMU) is used to provide the relative pose changes, but other mechanisms can be used, such as visual and ladar odometry.
Abstract: An atomic clock is used in conjunction with the GNSS receiver and the inertial sensors, creating a more capable inertial navigation system (INS). The system is composed of a GNSS receiver, an accurate clock, and a mechanism for measuring relative pose changes. The system being presented utilizes an inertial measurement unit (IMU) to provide the relative pose changes, but other mechanisms can be used—like visual and ladar odometry. The GNSS receiver measures the pseudo-ranges to the GNSS satellites in the field of view. These measurements are “time tagged” with the accuracy of the atomic clock. The relative motion between the pseudo-ranges is measured using the IMU. Finally, the lock is achieved by filtering these measurements. The filtering mechanism can vary, from the traditional Kalman Filters to other mechanisms that attempt to minimize the mean square error.

11 citations

Journal ArticleDOI
TL;DR: The concept of collaborative navigation is described, where a group of users, such as emergency crews, dismounted soldiers, or a swarm of robots or unmanned aerial vehicles (UAVs), navigate together in environments where GNSS may be compromised.
Abstract: This paper discusses the importance of the availability and continuity of position, navigation and timing (PNT) information, whose application scope and significance have exploded in the past 10-15 years. The Global Navigation Satellite System (GNSS) navigation gap has to be, therefore, filled in, to assure continuous, accurate and reliable PNT even in GNSS-challenged environments. As a viable solution, this paper describes the concept of collaborative navigation, where a group of users, such as emergency crews, dismounted soldiers, or a swarm of robots or unmanned aerial vehicles (UAVs), navigate together in environments where GNSS may be compromised. Urban, indoor and transition environments will be considered in the experimental part of the research performed at the Satellite Positioning and Inertial Navigation (SPIN) Lab at OSU. The two primary systems that we have developed and used in a number of demonstration applications are: the multi-sensor personal navigation (PN) system and the land-based platform, GPSVan; our ongoing research is focused on UAV navigation and application to geospatial data acquisition. Our ultimate research goal is to enable multi-sensory, robust cooperative navigation, including seamless transition between different types of navigation platforms that navigate together, with a special focus on transitional environments. The research trends and experimental results are based predominantly on the OSU experience only, while references to the findings of others are provided.

11 citations

Proceedings ArticleDOI
TL;DR: The authors conclude that, in spite of the fact that none of the navigation modes were designed for railway needs, their research found that the EGNOS NPA navigation mode is more feasible for land safety-related applications than the PA mode.
Abstract: This paper on the experimental evaluation of the European Geostationary Navigation Overlay Service (EGNOS) safety-of-life (SoL) services for railway signaling is from the proceedings of the 12th International Conference on Computer System Design and Operation in Railways and Other Transit Systems, held in Beijing, China, in 2010. The authors focus on the EGNOS Precision Approach (PA) and Non-precision Approach (NPA) navigation modes, which were mainly designed according to the specific aeronautical requirements. Two basic research approaches are used: a recently-developed methodology for the description of the Global Navigation Satellite System (GNSS) quality measures in terms of railway dependability attributes; and an operational EGNOS system with SoL receivers. The authors conclude that, in spite of the fact that none of the navigation modes were designed for railway needs, their research found that the EGNOS NPA navigation mode is more feasible for land safety-related applications than the PA mode. This is because of the NPA’s horizontal integrity risk allocation and the integrity risk definition on a 1-hour basis. The authors call for additional determination of the EGNOS dependability attributes in terms of failure modes, failure rates, reliability, and availability.

11 citations

Journal ArticleDOI
TL;DR: In this article, the authors computed the vertical ionospheric gradient (σ vig) with processed total electron content data from 16 stations of global positioning system aided geo augmented navigation network and using the time-step method.
Abstract: In ground-based augmentation systems (GBAS), such as local area augmentation system (LAAS) of USA, variation of ionospheric delay between LAAS ground facility and the user leads to residual ionospheric error. Hence, the users need to compute the bounds on residual ionospheric error with the help of a parameter, σ vertical_ionospheric_gradient (σ vig). As σ vig is a function of geographic region, the estimated value of σ vig for mid-latitude regions (4 mm/km) is not appropriate for low-latitude regions where ionosphere is highly varying and is characterised by large spatial gradients. In this study, gradients are computed with processed total electron content data from 16 stations of global positioning system aided geo augmented navigation network and using the time-step method. The distribution of gradients is compared with one-sigma Gaussian distribution to obtain ‘inflation factor’. σ vig overbound is computed for several days data comprising of quiet, moderate and storm conditions of ionosphere using the corresponding inflation factors. It is found that overbound values of 4.5 and 14.4 mm/km are required to bind the gradients under quiet and active conditions. These findings are useful for designing a safe and reliable GBAS for low-latitude stations.

11 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023122
2022266
202144
202062
201956
201851