scispace - formally typeset
Search or ask a question
Topic

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
More filters
Journal ArticleDOI
TL;DR: In this article, the authors show that severe scintillations in the equatorial zone disrupt geostationary satellite links even at the L-band frequency, and the minimum longitudinal separation required for reliable operation of satellite-based augmentation systems has been estimated, from the cumulative distribution of scintillation patch duration, to be 57° in the Indian longitude zone.
Abstract: In Satellite-Based Augmentation Systems (SBAS), the correction messages are transmitted to the users' receivers via geostationary communication satellites (GEOS) at GPS L1 (1575·42 MHz) frequency. Severe scintillations in the equatorial zone disrupt geostationary satellite links even at L-band. Observations of scintillations at 1·5 GHz from Calcutta (22·58°N, 88·38°E geographic, 32°N magnetic dip), located near the crest of the equatorial anomaly in the Indian zone, show that scintillations occur in patches of duration varying from a few minutes to several hours. During the solar maximum years 1998–2000, severe scintillations (Scintillation Index [ges ]15 dB) were recorded for 48 hr 55 min (1·27%) out of the total observation time of 3868 hr 9 min in the local time interval 19 to 00 hrs. In order to have a fail-safe system, it is suggested that more than one geostationary satellite be used in SBAS so that, if one link is disrupted, the other can be used for transmission of correction messages to the GPS users. The minimum longitudinal separation between two GEOS required for reliable operation of SBAS has been estimated, from the cumulative distribution of scintillation patch duration, to be 57° in the Indian longitude zone.

8 citations

Proceedings ArticleDOI
23 Jun 2014
TL;DR: This paper analyzes more than five years of public satellite clock data for GPS, GLONASS and Galileo, obtained from the Information Analytical Centre and the International GNSS Service, including the Multi-GNSS Experiment.
Abstract: Atomic clocks employed onboard satellites are one of the basic elements of Global Navigation Satellite Systems (GNSS). The positioning accuracy is highly dependent on these space clocks, whose stability is essential to ensure adequate performances. Monitoring and analyzing the behavior of space clocks is hence a fundamental task. Any nonstationarity, namely, any deviation of the clock behavior from the specifications, must be detected and communicated to the system users within a few seconds. In this paper we analyze more than five years of public satellite clock data for GPS, GLONASS and Galileo, obtained from the Information Analytical Centre and the International GNSS Service, including the Multi-GNSS Experiment. We evaluate and compare the stability of the system clocks under stationary behavior, namely, when the clocks behave according to the specifications. Then we classify the most evident clock apparent anomalies and we analyze them with tools specifically designed for clock nonstationarities, such as the dynamic Allan variance. Our goal is to understand the nature of every type of nonstationarity, and, eventually, to build a statistics of the most frequent ones.

8 citations

Journal ArticleDOI
TL;DR: In this article , a low-cost RTK (real-time kinematic) GNSS receiver was evaluated with a high-end geodetic receiver, and it was shown that the low cost GNSS receivers constitute a valuable alternative to the high-quality positioning receivers.

8 citations

Journal ArticleDOI
TL;DR: In this paper, the use for computation fix of a priori charted road network data managed by a Geographical Information System (GIS) is presented and a new method for treating the underlying problem of road selection is proposed.

8 citations

Journal ArticleDOI
TL;DR: Four different types of navigation strategies are developed and they are switched to adapt to different localization conditions according to the availability of DGPS and the existence of the curbs on the roadway, which improves the navigation performance adapting to the environment conditions.
Abstract: This paper discusses an autonomous navigation system for urban environments. For the localization of the robot, EKF (Extended Kalman Filter) algorithm is used with odometry, angle sensor, and DGPS (Differential Global Positioning System) measurement. Especially in an urban environment, DGPS is often blocked by buildings and trees and the resulting inaccurate positioning prevents the robot from safe and reliable navigation. In addition to the global information from DGPS, the local information of the curb on the roadway is used to track a route when the global DGPS information is inaccurate. For this purpose, curb detection algorithm is developed and implemented in the developed navigation algorithm. Four different types of navigation strategies are developed and they are switched to adapt to different localization conditions according to the availability of DGPS and the existence of the curbs on the roadway. The experimental results show that the designed switching strategy improves the navigation performance adapting to the environment conditions.

8 citations


Network Information
Related Topics (5)
Radar
91.6K papers, 1M citations
82% related
Object detection
46.1K papers, 1.3M citations
73% related
Communications system
88.1K papers, 1M citations
72% related
Wireless sensor network
142K papers, 2.4M citations
72% related
Wireless
133.4K papers, 1.9M citations
72% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023122
2022266
202144
202062
201956
201851