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Article
Potential of space-borne GNSS reflectometry to constrain simulations of the ocean circulation
The Agulhas current system transports warm and salty water masses from the Indian Ocean into the Southern Ocean and into the Atlantic. The transports impact past, present, and future climate on local and globa...
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Article
Estimating the yaw-attitude of BDS IGSO and MEO satellites
Precise knowledge and consistent modeling of the yaw-attitude of GNSS satellites are essential for high-precision data processing and applications. As the exact attitude control mechanism for the satellites of...
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Article
Open AccessTropospheric delay determination by Kalman filtering VLBI data
The troposphere is one of the most important error sources for space geodetic techniques relying on radio signals. Since it is not possible to model the wet part of the tropospheric delay with sufficient accur...
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Article
Accuracy and reliability of multi-GNSS real-time precise positioning: GPS, GLONASS, BeiDou, and Galileo
In this contribution, we present a GPS+GLONASS+BeiDou+Galileo four-system model to fully exploit the observations of all these four navigation satellite systems for real-time precise orbit determination, clock...
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Article
Systematic errors of map** functions which are based on the VMF1 concept
Precise global navigation satellite system (GNSS) positioning requires an accurate map** function (MF) to model the tropospheric delay. To date, the most accurate MF is the Vienna map** function 1 (VMF1)....
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Article
Open AccessPrecise positioning with current multi-constellation Global Navigation Satellite Systems: GPS, GLONASS, Galileo and BeiDou
The world of satellite navigation is undergoing dramatic changes with the rapid development of multi-constellation Global Navigation Satellite Systems (GNSSs). At the moment more than 70 satellites are already...
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Living Reference Work Entry In depth
Zukunft der globalen Geodäsie und Fernerkundung aus Sicht des Deutschen GeoForschungsZentrum (GFZ), Potsdam
Die Technologien und Methoden der Globalen Geodäsie und Fernerkundung (GGF) haben sich in den vergangenen Dekaden mit rascher Geschwindigkeit weiterentwickelt und die Resultate der heutigen GGF liefern wichtig...
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Article
An enhanced strategy for GNSS data processing of massive networks
Although the computational burden of global navigation satellite systems (GNSS) data processing is nowadays already a big challenge, especially for huge networks, integrated processing of denser networks with ...
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Article
Real-time precise point positioning regional augmentation for large GPS reference networks
An increasing number of GNSS reference stations are installed around the world to provide real-time precise positioning services. In most of the current services, a full network solution is required for the pr...
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Chapter
Reprocessing and Application of GPS Radio Occultation Data from CHAMP and GRACE
In recent years, the GPS radio occultation (RO) technique has become an established approach for global atmospheric remote sensing. For instance, GPS RO data are operationally used in numerical weather predict...
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Article
Open AccessNew approach for earthquake/tsunami monitoring using dense GPS networks
In recent times increasing numbers of high-rate GPS stations have been installed around the world and set-up to provide data in real-time. These networks provide a great opportunity to quickly capture surface ...
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Article
A method for improving uncalibrated phase delay estimation and ambiguity-fixing in real-time precise point positioning
In order to improve the performance of precise point positioning (PPP), this paper presents a new data processing scheme to shorten the convergence time and the observation time required for a reliable ambigui...
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Article
Least-squares harmonic estimation of the tropopause parameters using GPS radio occultation measurements
In order to investigate temporal variations of the tropopause parameters, Least-Squares Harmonic Estimation (LS-HE) is applied to the time series of the tropopause temperatures and heights derived from Global ...
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Chapter
Global Sporadic E Layer Characteristics Obtained from GPS Radio Occultation Measurements
Sporadic E layers have been observed on a global scale using GPS radio occultation measurements performed by the CHAMP, GRACE and FORMOSAT-3/COSMIC satellites. This has been done by analysing signal amplitude ...
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Chapter
Observations and Ray Tracing of Gravity Waves: Implications for Global Modeling
Vertical coupling by atmospheric waves is essential for the wind and temperature structure of the middle atmosphere. In particular, momentum carried by atmospheric gravity waves (GWs) governs the global circul...
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Article
A computationally efficient approach for estimating high-rate satellite clock corrections in realtime
Realtime satellite clock corrections are usually estimated using undifferenced phase and range observations from a global network. Because a large number of ambiguity parameters must be estimated, the computat...
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Book
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Chapter
The Operational Processing System for GPS Radio Occultation Data from CHAMP and GRACE
In this chapter, a description of the CHAMP and GRACE atmospheric processing system for radio occultation data at GFZ Potsdam is given. The generation of radio occultation products, as e.g. atmospheric excess ...
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Chapter
Global Atmospheric Data from CHAMP and GRACE-A: Overview and Results
The German geoscience satellite CHAMP (CHAllenging Minisatellite Payload) provides global atmospheric measurements almost continuously since early 2001. It currently generates a unique and operationally availa...
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Chapter
Near-Real-Time Provision and Usage of Global Atmospheric Data from CHAMP and GRACE (NRT-RO): Motivation and Introduction
Global and precise atmospheric satellite-based measurements with high temporal and spatial resolution are especially suited to characterize global change related atmospheric variations and to improve global nu...
