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.
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01 Jan 2001
17 citations
TL;DR: It is shown that the proposed method based on multiple reference stations and multiple kinematic stations with a common atmospheric delay parameter can effectively improve the reliability and accuracy of GNSS kinematics positioning.
Abstract: GEOHALO is a joint experiment of several German institutes for atmospheric research and earth observation where exploring airborne gravimetry over Italy using the High Altitude and LOng Range (HALO) aircraft data is one of the major goals. The kinematic positioning of the aircraft, on which all remote sensing instruments are located, by Global Navigation Satellite System (GNSS) is affected by the characteristics of long-distance, long-time duration, and high-platform dynamics which are a key factor for the success of the GEOHALO project. We outline the strategy and method of GNSS data processing which takes into account multiple GNSS systems (GPS and GLONASS), multiple static reference stations including stations from the International GNSS Service (IGS) and the EUropean REFerence network (EUREF), multiple GNSS-receiving equipments mounted on the kinematic platform, geometric relations between multiple antennas, and assumptions of similar characteristic of atmospheric effects within a small area above the aircraft. From this precondition, various data processing methods for kinematic positioning have been developed, applied and compared. It is shown that the proposed method based on multiple reference stations and multiple kinematic stations with a common atmospheric delay parameter can effectively improve the reliability and accuracy of GNSS kinematic positioning.
17 citations
01 Jan 2006
TL;DR: In this article, the authors presented a study into the expected level of navigation performance that may be achieved with chip-scale atomic clocks (CSACs) in a few years time.
Abstract: Currently available atomic clocks are too large, power hungry and costly for
use onboard GNSS receivers. Chip Scale Atomic Clocks (CSACs) are a
promising new technology that is expected to be commercially available in a
few years time. These devices are highly-stable atomic clocks in a small,
low power and low cost package that may replace less-stable crystal
oscillators in GNSS receivers. Previous studies have shown that integrating
an atomic clock with a GNSS receiver gives improved navigation
performance. This paper presents a study into the expected level of
navigation performance that may be achieved with CSACs. A theoretical
CSAC error model is constructed based on published performance. The
application considered in this study is "clock coasting" in airborne GPS
navigation. The results show that "clock coasting" with CSACs results in an
improved Dilution of Precision (DOP) for up to 55 minutes under low
satellite visibility or poor geometry, compared to a typical crystal oscillator.
Results also show that good navigation performance (PDOP < 6) can be
achieved for up to 80 minutes in four-satellite navigation with CSAC.
17 citations
09 May 2017
TL;DR: Digital signal processing for Global Navigation Satellite System (GNSS) receivers is mostly based on the assumption that the noise at the receiver input is Gaussian, which leads to a non-linear Least Squares problem where GNSS signal parameters are estimated by minimizing a quadratic cost function.
Abstract: Digital signal processing for Global Navigation Satellite System (GNSS) receivers is mostly based on the assumption that the noise at the receiver input is Gaussian This assumption leads to a non-linear Least Squares (LS) problem where GNSS signal parameters are estimated by minimizing a quadratic cost function The receiver performance can be however significantly degraded by non-Gaussian phenomena such as interference and jamming
17 citations
03 May 2011
TL;DR: The architecture of an international GNSS Monitoring and Assessment System (iGMAS) is designed to achieve the 4-overlap and 1- overlap coverage and sophisticated analysis respectively and some related works that have been done to monitor and assess BeiDou Open Service are introduced, which can be used to verify the feasibility of this proposed system.
Abstract: Interoperability of GNSS Open Services have already been a significant tendency in developing all Satellite Navigation Systems, and its performance will directly affect the security and reliability of its usages. Therefore, monitoring and assessment of GNSS Open Services have become an attention focus for all providers and users of GNSS. This paper begins to illuminate the elements and methods for monitoring and assessing GNSS Open Services. Then according to the requirements, the architecture of an international GNSS Monitoring and Assessment System (iGMAS) is designed to achieve the 4-overlap and 1-overlap coverage and sophisticated analysis respectively. Here, this iGMAS is based on omni-directional antennas, multi-beam antennas and a high-gain paraboloid antenna. In the meantime, the configuration scheme of world-wide monitoring stations is provided. Finally, some related works that have been done to monitor and assess BeiDou Open Service are introduced, which can be used to verify the feasibility of this proposed system.
17 citations