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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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Journal ArticleDOI
TL;DR: A review of multi-GNSS for Earth Observation and emerging application progress is presented in this article , including GNSS positioning and orbiting, GNSS ionosphere and space weather, GNS-Reflectometry and GNSS earthquake monitoring, as well as GNSS integrated techniques for land and structural health monitoring.
Abstract: Global Navigation Satellite System (GNSS) has drawn the attention of scientists and users all over the world for its wide-ranging Earth observations and applications. Since the end of May 2022, more than 130 satellites are available for fully global operational satellite navigation systems, such as BeiDou Navigation Satellite System (BDS), Galileo, GLONASS and GPS, which have been widely used in positioning, navigation, and timing (PNT), e.g., precise orbit determination and location-based services. Recently, the refracted, reflected, and scattered signals from GNSS can remotely sense the Earth’s surface and atmosphere with potential applications in environmental remote sensing. In this paper, a review of multi-GNSS for Earth Observation and emerging application progress is presented, including GNSS positioning and orbiting, GNSS meteorology, GNSS ionosphere and space weather, GNSS-Reflectometry and GNSS earthquake monitoring, as well as GNSS integrated techniques for land and structural health monitoring. One of the most significant findings from this review is that, nowadays, GNSS is one of the best techniques in the field of Earth observation, not only for traditional positioning applications, but also for integrated remote sensing applications. With continuous improvements and developments in terms of performance, availability, modernization, and hybridizing, multi-GNSS will become a milestone for Earth observations and future applications.

23 citations

Proceedings ArticleDOI
01 Dec 2012
TL;DR: The reliability of integer ambiguity estimation depends on the strength of the underlying GNSS model and on the applied integer estimation method as discussed by the authors, which brings certain challenges and limitations that need to be addressed and have not all been solved so far.
Abstract: Next generation Global Navigation Satellite Systems will open the door to a whole new field of applications, for example in Earth observation, construction, and safety-of-life navigation. This implies very high requirements not only on precision and availability, but also on reliability. Integer carrier phase ambiguity resolution is the key to (near) real-time and high-precision GNSS positioning and navigation. The reliability of integer ambiguity estimation depends on the strength of the underlying GNSS model and on the applied integer estimation method. This brings certain challenges and limitations that need to be addressed and have not all been solved so far. The aim of this contribution is to address these remaining challenges and limitations: it will be explained why it is important to do so, and how solutions can be obtained. Experimental results will be used to underpin the importance and potential improvement in terms of precision and/or reliability.

23 citations

Patent
11 Dec 2009
TL;DR: In this paper, a method of processing global navigation satellite system (GNSS) data includes identifying one or more GNSS satellites servicing a predefined area, receiving at least one of GNSS almanac data or space-based augmentation system (SBAS) data for the satellites servicing the predicted area, determining the performance of the GNSS satellite servicing the target area using the almanac or satellite augmentation data, and applying a performance rating to the targeted area based on the performance.
Abstract: A method of processing global navigation satellite system (GNSS) data includes identifying one or more GNSS satellites servicing a predefined area, receiving at least one of GNSS almanac data or space-based augmentation system (SBAS) data for the satellites servicing the predefined area, determining the performance of the GNSS satellites servicing the predefined area using the almanac data or SBAS data, and applying a performance rating to the predefined area based on the performance of the GNSS satellites.

23 citations

30 Jan 2008
TL;DR: Two new methods, each of which transfers some of the TTA responsibility onto the aircraft, show great promise for global provision of vertical guidance and their performance is evaluated under conditions of satellite outages.
Abstract: Ionospheric delay uncertainty creates the largest restriction to the availability of high integrity satellite navigation for today’s single frequency systems. LAAS, WAAS, and the other SBAS providers are limited in their coverage and service levels by the variability of the ionosphere. With the arrival of the new civil signals at L5, comes the ability to directly estimate and remove the ionospheric delay at any point on the Earth. This allows for new architectures exploiting L1 and L5 to bring airplanes within two hundred feet of the ground anywhere on the globe. The FAA has initiated a study panel, called the GPS Evolutionary Architectural Study (GEAS) to look into future architectures to provide this global service. The GEAS has determined that Time-to-Alert (TTA) will be one of the more difficult challenges for any global monitoring approach. To address this problem, the GEAS is looking at two methods, each of which transfers some of the TTA responsibility onto the aircraft. The first method is called Relative RAIM (RRAIM). It uses precise carrier phase measurements to propagate older code based position solutions forward in time. The veracity of the propagation is checked using RAIM on the very low noise carrier phase measurements. In this way, the overall TTA can be less than a second, but the ground is given tens of seconds to minutes to identify a fault. The second method is Absolute RAIM (ARAIM). This is more similar to existing FDE techniques except that the requirements must be made much more precise in order to support smaller alert limits. Again, the aircraft is able to raise a flag within seconds of receiving faulty data. The ground is allowed to take an hour or longer to identify the fault and remove it from future consideration. The protection level equations for both methods will be evaluated in this paper. In addition to the errors considered in today’s equations, the two new methods will include explicit bias terms to improve the handling of nominal biases and non-gaussian error sources. A critical parameter in the performance of these approaches is the strength of the constellation. The performance of each is evaluated for constellations optimized for 24, 27, and 30 satellites. Further, their performance is evaluated under conditions of satellite outages. RRAIM can perform very well with fewer satellites. ARAIM on the other hand is ideal for integrating in Galileo or other satellite constellations. Both of the methods show great promise for global provision of vertical guidance.

23 citations

Patent
Jason Rife1
29 Jun 2012
TL;DR: In this article, the authors present a fault detection system for verifying the quality of global navigation satellite system (GNSS) measurements, which includes a GNSS receiver, a wireless communications device, and a fault detector.
Abstract: Systems and methods are disclosed herein for verifying the quality of global navigation satellite system (GNSS) measurements. The system includes a GNSS receiver, a wireless communications device, and a fault detection processor. The GNSS receiver includes a GNSS antenna for receiving signals from a plurality of global navigation satellites and a processor for calculating a ranging measurement for each of the global navigation satellites from the GNSS receiver to the global navigation satellite. The wireless communications device receives ranging measurements from at least one other GNSS receiver. The fault detection processor performs a fault detection algorithm to determine if there is an anomaly affecting the ranging measurements of the GNSS receiver and the at least one other GNSS receiver.

23 citations


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